WO2015178113A1 - 光計測装置及び光計測方法 - Google Patents
光計測装置及び光計測方法 Download PDFInfo
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- WO2015178113A1 WO2015178113A1 PCT/JP2015/060876 JP2015060876W WO2015178113A1 WO 2015178113 A1 WO2015178113 A1 WO 2015178113A1 JP 2015060876 W JP2015060876 W JP 2015060876W WO 2015178113 A1 WO2015178113 A1 WO 2015178113A1
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- correction
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- excitation light
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Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/443—Emission spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0254—Spectrometers, other than colorimeters, making use of an integrating sphere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
- G01N2201/12746—Calibration values determination
- G01N2201/12753—Calibration values determination and storage
Definitions
- One aspect of the present invention relates to an optical measurement device and an optical measurement method.
- Patent Document 1 when obtaining the internal quantum efficiency (luminescence quantum yield), a sample is obtained from a reflectance measurement value based on a spectral reflectance standard in an integrating sphere and a reflectance measurement value based on the sample.
- An absolute fluorescence quantum efficiency measuring device for obtaining the absorption rate of is described.
- the excitation light absorbed by the sample is measured in a state where the excitation light after passing through the sample is reflected in the integration space, and the excitation light after passing through the sample is not reflected in the integration space.
- measurement errors due to re-excitation are reduced by performing such a two-stage measurement process.
- Non-Patent Documents 1 to 3 excitation light is irradiated with a predetermined beam cross section so as to be included (covered) in the sample, and the area of the sample at the irradiation position of the excitation light (hereinafter simply referred to as “sample area”).
- sample area the area of the sample at the irradiation position of the excitation light.
- the sample in the integrator is irradiated with excitation light at a predetermined beam cross section and output from the integrator. It is intended to detect the measured light.
- the absorptance is a parameter having a relationship between the reflectance and the front and back, and is synonymous with “1-reflectance”.
- the calculated optical characteristic may be May be estimated differently depending on the size relationship between the area of the sample and the area of the predetermined beam cross-section in the excitation light (whether the predetermined beam cross-section is covered by the sample or the sample).
- the absorptance and external quantum efficiency can be obtained with high accuracy using an area ratio correction value relating to the area ratio between a predetermined beam cross section and the sample, for example, as shown in the following equation (i). It may be difficult to measure the area of the beam cross section of the excitation light in the integrator.
- H (S 2 / S 1 ) ⁇ H ′ (i)
- H light characteristic after correction
- H ′ light characteristic before correction
- S 1 Area of sample
- S 2 Area of predetermined beam cross section in excitation light
- An object of one aspect of the present invention is to provide an optical measurement device and an optical measurement method capable of accurately obtaining optical characteristics without directly measuring the area of the beam cross section of excitation light.
- An optical measurement apparatus is an optical measurement apparatus that irradiates a sample with excitation light and detects measurement light, and includes an integrator in which the sample is disposed, and the excitation light is input into the integrator.
- An optical system that irradiates the sample with excitation light at a predetermined beam cross section, a photodetector that detects measurement light output from the integrator and outputs sample intensity data at one or more wavelengths, and correction data
- a storage unit that is stored, and an optical property calculation unit that calculates the optical property of the sample based on the intensity data of the sample output from the photodetector and the correction data stored in the storage unit, and the correction data is , First correction intensity data that is a detection value of the first measurement light output from the integrator when the first light absorbing member disposed in the integrator is irradiated with the excitation light with a predetermined beam cross section; The excitation light is applied to the second light absorbing member arranged in the integrator.
- the second light absorbing member is covered with the first light absorbing member.
- An optical measurement apparatus is an optical measurement apparatus that irradiates a sample with excitation light and detects measurement light, and includes an integrator in which the sample is arranged, and the excitation light into the integrator.
- An optical system that inputs and irradiates the sample with excitation light at a predetermined beam cross section, a photodetector that detects measurement light output from the integrator and outputs intensity data of the sample at one or more wavelengths, and correction
- a storage unit that stores data
- an optical property calculation unit that calculates the optical property of the sample based on the intensity data of the sample output from the photodetector and the correction data stored in the storage unit, and correction
- the data is first correction intensity data that is a detection value of the first measurement light output from the integrator when the first light absorbing member disposed in the integrator is irradiated with the excitation light with a predetermined beam cross section.
- excitation with respect to the second light absorbing member disposed in the integrator Is a correction value calculated based on second correction intensity data that is a detection value of the second measurement light output from the integrator when the beam is irradiated with a predetermined beam cross section, and the predetermined beam of excitation light
- the area of the cross section is smaller than the area of the first light absorbing member and larger than the area of the second light absorbing member.
- An optical measurement method is an optical measurement method for irradiating a sample with excitation light and detecting measurement light, and applying excitation light to a first light absorbing member disposed in an integrator.
- Based on the process of calculating the correction data and the strength of the sample comprises a step of calculating the optical properties of the sample, a predetermined beam cross-section of the excitation light, with covered with the first light-absorbing member, covering the second light-absorbing member.
- An optical measurement method is an optical measurement method for detecting measurement light by irradiating a sample with excitation light, the excitation light being applied to a first light absorbing member disposed in an integrator. Irradiating with a predetermined beam cross section, detecting the first measurement light output from the integrator to acquire the first correction intensity data, and the second light absorbing member disposed in the integrator A step of irradiating the excitation light with a predetermined beam cross section and detecting the second measurement light output from the integrator to acquire the second correction intensity data, and the excitation light with respect to the sample arranged in the integrator , The step of detecting measurement light output from the integrator to acquire the intensity data of the sample at one or a plurality of wavelengths, the first correction intensity data, and the second correction intensity Based on the data, the process of calculating the correction data and the test Calculating the optical characteristics of the sample based on the intensity data and the correction data, and the area of the predetermined beam cross section of the excitation light is smaller than
- the correction data includes first correction intensity data detected by irradiating the first light absorption member with excitation light at a predetermined beam cross section covered by the first light absorption member.
- the second correction intensity data detected by irradiating the second light absorbing member with the excitation light at a predetermined beam cross section covering the second light absorbing member is calculated. Since such correction data is found to correspond to the area ratio correction value, the area of the beam section of the excitation light is calculated by calculating the optical characteristics of the sample from the intensity data of the sample using the correction data. Therefore, it is possible to obtain the optical characteristics with high accuracy without actually measuring directly.
- the correction data includes a first absorption rate calculated based on the first correction intensity data and a second absorption rate calculated based on the second correction intensity data. And a correction value calculated from the ratio.
- the first absorption rate calculated based on the first correction intensity data and the second correction intensity data are calculated.
- Correction data can be calculated from the ratio of the second absorption rate.
- the correction data includes a first reflectance calculated based on the first correction intensity data and a second reflectance calculated based on the second correction intensity data. And a correction value calculated from the ratio.
- the first reflectance calculated based on the first correction intensity data and the second reflection calculated based on the second correction intensity data. Correction data can be calculated by the ratio of the ratio.
- the correction data may be correction values at a plurality of wavelengths.
- the correction data can be adapted when calculating the optical characteristics from the intensity data of the sample at a plurality of wavelengths.
- the first light absorption member and the second light absorption member are formed of a material having the same absorption rate. Also good.
- the area of the sample at the excitation light irradiation position is equal to the area of the second light absorbing member at the excitation light irradiation position, and the predetermined beam cross-section of the excitation light has
- the covering and optical characteristic calculation unit may calculate the absorptance or reflectance of the sample as the optical characteristic based on the intensity data and the correction data of the sample.
- the area of the sample at the excitation light irradiation position is equal to the area of the second light absorbing member at the excitation light irradiation position.
- the absorptance or reflectance of the sample may be calculated as the optical characteristics based on the intensity data and correction data of the sample.
- the correction data is used.
- the area of the sample at the excitation light irradiation position is equal to the area of the first light absorbing member at the excitation light irradiation position, and a predetermined beam cross section of the excitation light is applied to the sample.
- the covered light characteristic calculation unit may calculate the internal quantum efficiency of the sample as the light characteristic based on the intensity data and the correction data of the sample.
- the area of the sample at the excitation light irradiation position is equal to the area of the first light absorbing member at the excitation light irradiation position, and a predetermined beam cross section of the excitation light is applied to the sample.
- the internal quantum efficiency of the sample may be calculated as the optical characteristic based on the intensity data and the correction data of the sample.
- the calculated internal quantum efficiency tends to be estimated differently with respect to the true value.
- the sample is obtained using the correction data.
- the predetermined beam cross section covered by the first light absorbing member has an area smaller than the area of the first light absorbing member at the excitation light irradiation position, and the second light.
- the predetermined beam cross section covering the absorbing member may have an area larger than the area of the second light absorbing member at the excitation light irradiation position.
- the predetermined beam cross section covered by the first light absorbing member has an area smaller than the area of the first light absorbing member at the irradiation position of the excitation light, and the second light.
- the predetermined beam cross section covering the absorbing member may have an area larger than the area of the second light absorbing member at the excitation light irradiation position.
- an optical measurement device and an optical measurement method capable of accurately obtaining optical characteristics without directly measuring the area of the beam cross section of excitation light.
- FIG. 1 shows the structure of the optical measuring device which concerns on one Embodiment. It is an enlarged view of the inside of a dark box and its peripheral part in the optical measuring device of FIG. It is a figure which shows the principal part of the optical measuring device of FIG. It is a figure which shows the sample holder in the optical measuring device of FIG. It is a figure which shows the sample container in the optical measuring device of FIG. It is a figure which shows the 1st correction member in the optical measuring device of FIG. It is a figure which shows the 2nd correction member in the optical measuring device of FIG. It is a flowchart which shows the optical measuring method implemented with the optical measuring device of FIG.
- FIG. 1 is a diagram illustrating a configuration of an optical measurement device according to an embodiment.
- the optical measurement device 100 measures or evaluates optical characteristics such as fluorescence characteristics by a photoluminescence method (PL method) for a sample as a sample to be measured.
- the sample is, for example, a fluorescent sample such as an organic EL (Electroluminescence) material or a luminescent material for white LED (Light Emitting Diode) or FPD (Flat Panel Display).
- PL method photoluminescence method
- the sample for example, a fluorescent sample such as an organic EL (Electroluminescence) material or a luminescent material for white LED (Light Emitting Diode) or FPD (Flat Panel Display).
- a fluorescent sample such as an organic EL (Electroluminescence) material or a luminescent material for white LED (Light Emitting Diode) or FPD (Flat Panel Display).
- the sample for example, powder, liquid (solution), solid or thin film
- optical characteristics include absorptance, internal quantum efficiency (luminescence quantum yield), and external quantum efficiency.
- the absorption rate is a parameter related to the number of photons absorbed.
- the internal quantum efficiency is a parameter relating to the ratio of the number of photons emitted by light emission to the number of photons absorbed.
- External quantum efficiency is a parameter related to the number of emitted photons.
- External quantum efficiency is the product of absorption rate and internal quantum efficiency.
- the absorptance has a relationship between the reflectance, which is a parameter regarding the number of reflected photons, and the front and back. Absorptivity is synonymous with “1-reflectance”.
- the optical measuring device 100 includes a main body 1A, a data analysis device 50, an input device 91, and a display device 92.
- the main body 1 ⁇ / b> A is shown in a plan view partly in section. 1, for the sake of convenience, a cross section of an integrating sphere 14 described later is shown as an end face (the same applies to FIGS. 2 and 3).
- FIG. 2 is an enlarged view of the inside of the dark box and its peripheral portion in the optical measuring device of FIG. 1, and FIG. 3 is a diagram showing the main part of the optical measuring device of FIG.
- a main body 1A in FIG. 3 is a cross-sectional view taken along line III-III in FIG.
- the main body 1A irradiates the sample 1 with excitation light L1 having a predetermined wavelength, and detects the measurement light L2 generated in response to the irradiation.
- the main body 1A includes a dark box 5.
- the dark box 5 is a rectangular parallelepiped box made of metal.
- the dark box 5 blocks light from entering from the outside.
- the inner surface 5a of the dark box 5 is coated with a material that absorbs the excitation light L1 and the measurement light L2.
- a light output unit 7 that outputs the excitation light L ⁇ b> 1 of the light generation unit 6 is connected to one side wall of the dark box 5.
- the light generation unit 6 is an excitation light source configured by, for example, a xenon lamp or a spectroscope.
- the light generator 6 generates excitation light L1.
- the excitation light L ⁇ b> 1 is collimated by the lens 8 provided in the light output unit 7 and is input into the dark box 5.
- a light input unit 11 of a spectral detector (photodetector) 9 is connected to the rear wall of the dark box 5.
- the spectroscopic detector 9 is optically coupled to the integrating sphere 14.
- the measurement light L ⁇ b> 2 is narrowed by an aperture opening 12 a that is a diaphragm member 12 provided in the light input unit 11, and is input into the spectral detector 9 through the slit 13.
- the spectroscopic detector 9 decomposes and detects the measurement light L2 into wavelength components, and outputs the wavelength spectrum data of the measurement light L2 to the data analysis device 50 as intensity data of the sample 1 at a plurality of wavelengths.
- the spectroscopic detector 9 outputs first and second correction intensity data and first and second reference intensity data to the data analysis apparatus 50 by detecting measurement light, as will be described later.
- a multi-channel detector configured by a spectroscope, a CCD sensor (or a CMOS sensor), or the like is used.
- the intensity data at a plurality of wavelengths can be expressed as data (spectral data) having the horizontal axis as the wavelength and the vertical axis as the intensity, for example.
- an integrating sphere (light integrator) 14 is arranged.
- the integrating sphere 14 has an inner surface 14 a that diffuses and reflects light input into the integrating sphere 14.
- the inner surface 14a of the integrating sphere 14 is coated with a highly diffusive reflector such as barium sulfate, or formed of a highly reflective material having a reflectivity close to 1 such as PTFE or Spectralon (registered trademark). Yes.
- the integrating sphere 14 is formed with a light input opening 15 for inputting the excitation light L1 and a light output opening 16 for outputting the measurement light L2.
- the dark box 5, the light generator 6, and the spectroscopic detector 9 are accommodated in a housing 10 made of metal.
- optical axis of the excitation light L1 output from the light output unit 7 of the light generation unit 6 and the optical axis of the measurement light L2 input to the light input unit 11 of the spectroscopic detector 9 are substantially orthogonal in the horizontal plane. is doing.
- the lower part of the integrating sphere 14 and the stage 31 to which the integrating sphere 14 is fixed are formed with an opening 37 that communicates them.
- the opening 37 is provided with a sample holder 24 detachably attached from the lower side of the stage 31. That is, the sample holder 24 is detachably attached to the integrating sphere 14.
- the sample holder 24 places at least the sample container 40 for storing the sample 1 on the integrating sphere 14.
- the main body 1A includes a handle 62 as optical path switching means for switching the optical path of the excitation light L1.
- the stage 63 is moved by the handle 62 to switch between the lens 61 and the collimator lens 64.
- the excitation light L 1 is collected by the lens 61 in the dark box 5 and input into the integrating sphere 14 through the light input opening 15. (See FIG. 2).
- the excitation light L1 is collected by the collimator lens 64 in the dark box 5 and sequentially reflected by the mirrors 65 and 66 into the integrating sphere 14. It is input (see FIG. 3).
- An aperture 67 is provided in the light input opening 15 of the integrating sphere 14.
- a cutout 67 a is formed in at least a part of the opening of the aperture 67.
- the shape of the notch 67a is formed so that the excitation light L1 irradiated to the sample container 40, the first correction member 70, and the second correction member 80 has a predetermined beam cross section (beam diameter).
- the collimator lens 64, the mirrors 65 and 66, and the aperture 67 constitute an optical system that irradiates the sample 1 with the excitation light L1. This optical system is optically coupled to the integrating sphere 14.
- the excitation light L 1 input to the dark box 5 is collimated by the collimator lens 64, sequentially reflected by the mirrors 65 and 66, passes through the aperture 67, and is input to the integrating sphere 14.
- the excitation light L1 is irradiated onto the sample container 40 of the sample holder 24 with a predetermined beam cross section D (see FIG. 5).
- this optical system is not restricted to being comprised by the collimator lens 64, the mirrors 65 and 66, and the aperture 67, Various forms are possible.
- this optical system may be configured by a light guide that optically couples the light generation unit 6 and the integrating sphere 14.
- the predetermined beam cross section D in the excitation light L1 is, for example, 4.8 mm ⁇ 12 mm.
- a diaphragm member 17 is provided in the light output opening 16 of the integrating sphere 14.
- the measurement light L ⁇ b> 2 is narrowed by the opening 17 a that is the aperture of the diaphragm member 17 and is output to the outside of the integrating sphere 14.
- a baffle 84 is disposed at a position facing the light output opening 16 in the integrating sphere 14.
- the baffle 84 is supported by a support column 85 erected on the inner surface 14 a of the integrating sphere 14.
- a baffle 86 is integrally formed on the inner surface 14 a of the integrating sphere 14. The baffle 84.86 prevents the measurement light L2 from being directly input to the light input unit 11 of the spectroscopic detector 9.
- FIG. 4 (A) is a plan view showing a sample holder in the optical measuring device of FIG. 1, and FIG. 4 (B) is an end view taken along line IVb-IVb of FIG. 4 (A).
- the sample holder 24 places a sample container 40 (described later) that houses the sample 1 on the integrating sphere 14 as an irradiation object.
- the sample holder 24 replaces the sample container 40, and includes a first correction member 70 capable of accommodating the first light absorbing member A and a second correction member 80 capable of accommodating the second light absorbing member B.
- the sample holder 24 has a pedestal 241 for placing an irradiation object.
- the pedestal 241 is formed of a highly reflective material like the inner surface 14a of the integrating sphere 14.
- the pedestal 241 has a white color, for example.
- the pedestal 241 is a portion exposed to the integration space of the integrating sphere 14 in the sample holder 24.
- the pedestal 241 has a circular outer shape when viewed from above.
- a holding portion 242 protrudes from the outer periphery of the upper portion of the base 241.
- the holding part 242 is provided with a notch.
- the holding unit 242 holds the irradiation object by placing the irradiation object in the notch.
- FIG. 5 (A) is a plan view showing the sample container
- FIG. 5 (B) is a cross-sectional view taken along the line Vb-Vb in FIG. 5 (A).
- the sample container 40 is for placing the sample 1.
- the sample container 40 has a sample substrate 41 having a rectangular plate shape.
- the sample substrate 41 is provided with a sample storage portion 42.
- the sample storage portion 42 is a recess for storing the sample 1.
- the sample container 40 is formed of a transparent (light transmissive) material such as quartz or synthetic quartz, for example, to suppress light absorption by the sample container 40. Note that the sample container 40 may not be completely transparent.
- the sample substrate 41 may have another shape such as a circular plate shape.
- the sample container 42 has a long shape when viewed from above.
- the sample storage unit 42 stores the sample 1 so that the sample 1 is included (that is, covered) in a predetermined beam section D of the excitation light L1 to be irradiated.
- the sample storage unit 42 stores the sample 1 so that the sample 1 is included (encased) in the predetermined beam cross section D. That is, the predetermined beam cross section D of the excitation light L1 at the position of the sample storage unit 42 includes a portion of the sample 1 exposed from the sample storage unit 42. Therefore, the range in which the excitation light L1 irradiates the sample container 40 includes the arrangement range (exposure range) of the sample 1 on the sample substrate 41.
- the sample storage portion 42 may have another shape such as a circular shape as viewed from above.
- the area S 2 of the predetermined beam cross-section D is greater than (area sample 1 exposed from the sample accommodating portion 42 in the sample container 40) S 1 area of the sample 1 .
- the area S 2 of the predetermined beam cross-section D is greater than the area S 1 of the sample 1.
- the region related to the area S 1 of the sample 1 is 4 mm ⁇ 10 mm.
- FIG. 6A is a plan view showing the first correction member in a state where the first light absorbing member is not accommodated
- FIG. 6B is a cross-sectional view taken along the line VIb-VIb in FIG. 6A
- 6C is a plan view showing the first correction member in a state where the first light absorbing member is accommodated
- FIG. 6D is a cross-sectional view taken along the line VId-VId of FIG. 6C. It is.
- the first correction member 70 is for arranging the first light absorbing member A.
- the first correction member 70 has a first correction substrate 71 having the same rectangular plate shape as the sample substrate 41. Similar to the sample container 40, the first correction member 70 is formed of a transparent material such as quartz or synthetic quartz.
- the first correction substrate 71 is provided with a first correction accommodating portion 72 as a recess for accommodating the first light absorbing member A.
- the first light absorbing member A is made of a non-light emitting solid material having a high absorption rate. Examples of the first light absorbing member A include polyacetal resin (acetal resin) and polyurethane resin.
- the first light absorbing member A is filled so that the first correction accommodating portion 72 is completely closed over the entire area in the first correction accommodating portion 72.
- the first correction accommodating portion 72 has a long shape when viewed from above. Since the shape of the first correction accommodating portion 72 has a long axis, the opening area can be increased.
- the first correction accommodating portion 72 accommodates the first light absorbing member A so that the first light absorbing member A includes (that is, covers) the predetermined beam cross section D of the excitation light L1 to be irradiated. .
- the first correction accommodating portion 72 accommodates the first light absorbing member A so that the first light absorbing member A includes (wraps) the predetermined beam cross section D. That is, the predetermined beam cross section D of the excitation light L1 at the position of the first correction member 70 is included in the portion exposed from the first correction accommodating portion 72 of the first light absorbing member A.
- the range in which the excitation light L1 irradiates the first correction member 70 is included in the arrangement range (exposure range) of the first light absorbing member A on the first correction substrate 71.
- the first correction accommodating portion 72 may have another shape such as a circular shape when viewed from above.
- the area S 2 of the predetermined beam cross-section D is smaller than the area S A of the first light-absorbing member A.
- the predetermined beam cross-section D as described above is a 4.8 mm ⁇ 12 mm
- the area of the area S A of the first light-absorbing member A is a 8 mm ⁇ 20 mm.
- FIG. 7A is a plan view showing the second correction member in a state where the second light absorbing member is not accommodated
- FIG. 7B is a cross-sectional view taken along the line VIIb-VIIb in
- FIG. 7C is a plan view showing the second correction member in a state where the second light absorbing member is accommodated
- FIG. 7D is a cross-sectional view taken along the line VIId-VIId in FIG. 7C. It is.
- the second correction member 80 is for arranging the second light absorbing member B.
- the second correction member 80 has the same configuration as the sample container 40 (see FIG. 5) except that the second light absorbing member B is accommodated instead of the sample 1. That is, the second correction member 80 has the same rectangular plate-like second correction substrate 81 as the sample container 40, and is formed of a transparent material such as quartz or synthetic quartz.
- the second correction member 80 is provided with a second correction accommodating portion 82 having the same shape as the sample accommodating portion 42 as a concave portion for accommodating the second light absorbing member B.
- the second light absorbing member B is made of a non-light emitting solid material having a high absorption rate.
- the second light absorbing member B may be formed of a material having the same absorption rate as the first light absorbing member A.
- the second light absorbing member B is filled in the entire area in the second correction accommodating portion 82 so that the second correction accommodating portion 82 is completely closed.
- the second correction accommodating portion 82 When viewed from the direction in which the excitation light L1 is irradiated, the second correction accommodating portion 82 is configured so that the second light absorbing member B is included in a predetermined beam section D of the irradiated excitation light L1 (that is, covered).
- the second light absorbing member B is accommodated.
- the second correction accommodating portion 82 accommodates the second light absorbing member B so that the second light absorbing member B is included (encased) in the predetermined beam section D. That is, the predetermined beam cross section D of the excitation light L1 at the position of the second correction member 80 includes a portion exposed from the second correction accommodating portion 82 of the second light absorbing member B.
- the range in which the excitation light L1 irradiates the second correction member 80 includes the arrangement range (exposure range) of the second light absorbing member B on the second correction substrate 81.
- the second correction accommodating portion 82 may have another shape such as a circular shape when viewed from above.
- the area of the second light absorbing member B (the area of the second light absorbing member B exposed from the second correction accommodating portion 82 of the second correction member 80).
- S B since the sample accommodating portion 42 and the second correction housing portion 82 is the same shape, there is a surface area S 1 and substantially the same sample 1.
- Area S 2 of the predetermined beam cross-section D is greater than the area S B of the second light-absorbing member B.
- the area S 2 of the predetermined beam cross-section D is greater than the area S B of the second light-absorbing member B.
- the predetermined beam cross-section D as described above is a 4.8 mm ⁇ 12 mm
- the area of the area S B of the second light-absorbing member B is a 4 mm ⁇ 10 mm.
- the data analysis device 50 performs necessary data analysis on the intensity data output from the spectroscopic detector 9 and acquires information on the sample 1.
- the data analysis device 50 includes a processor and a memory, and is, for example, a computer such as a personal computer.
- the data analysis device 50 is electrically coupled to the spectroscopic detector 9.
- the data analysis apparatus 50 includes an intensity data acquisition unit 51 that acquires various types of intensity data at a plurality of wavelengths from the spectral detector 9, and correction data that calculates correction data based on the intensity data acquired by the intensity data acquisition unit 51.
- the storage unit 53 that stores at least the correction data calculated by the correction data calculation unit 52, the intensity data acquired by the intensity data acquisition unit 51, and the correction data stored in the storage unit 53 And an optical characteristic calculation unit 54 for calculating one optical characteristic (spectral characteristic).
- the intensity data acquisition unit 51, the correction data calculation unit 52, the storage unit 53, and the light characteristic calculation unit 54 are electrically coupled to each other.
- the storage unit 53 includes a memory of the data analysis device 50 and / or a storage device (Storage) such as an external storage device that is electrically coupled to the data analysis device 50.
- the intensity data acquisition unit 51, the correction data calculation unit 52, and the light characteristic calculation unit 54 are realized by the processor of the data analysis device 50. Details of the processing of the data analysis device 50 will be described later.
- the input device 91 is used for input of instructions for data analysis or the like or input of analysis conditions.
- the input device 91 is connected to the data analysis device 50.
- the display device 92 is used for displaying the obtained data analysis result.
- the display device 92 is connected to the data analysis device 50.
- the measurement light output from the integrating sphere 14 is detected by the spectroscopic detector 9, and first reference intensity data that is reference intensity data at a plurality of wavelengths is output to the data analysis device 50.
- the first reference intensity data is acquired by the intensity data acquisition unit 51, and the first reference intensity data is stored in the storage unit 53.
- the spectroscopic detector 9 detects measurement light (first measurement light) output from the integrating sphere 14, and first correction intensity data, which is intensity data of the first light absorbing member A at a plurality of wavelengths, The data is output to the data analysis device 50.
- the first intensity data for correction is acquired by the intensity data acquisition unit 51, and the first correction intensity data is stored in the storage unit 53.
- the measurement light output from the integrating sphere 14 is detected by the spectroscopic detector 9, and second reference intensity data that is reference intensity data at a plurality of wavelengths is output to the data analysis device 50.
- the second reference intensity data is acquired by the intensity data acquisition unit 51, and the second reference intensity data is stored in the storage unit 53.
- the second correction member 80y (see FIG. 7) in which the second light absorbing member B is accommodated and held is placed on the sample holder 24, and the sample holder 24 is attached to the integrating sphere 14.
- the excitation light L1 generated by the light generator 6 is input into the integrating sphere 14, and the second correction member 80y is irradiated with the excitation light L1 with a predetermined beam cross section D.
- the second light absorbing member B is irradiated with the excitation light L1 so that the second light absorbing member B is included in the predetermined beam cross section D.
- the spectroscopic detector 9 detects measurement light (second measurement light) output from the integrating sphere 14, and second correction intensity data, which is intensity data of the second light absorbing member B at a plurality of wavelengths, The data is output to the data analysis device 50.
- the intensity data acquisition unit 51 acquires second correction intensity data, and the second correction intensity data is stored in the storage unit 53.
- the second absorption rate is calculated based on the second reference intensity data acquired in step S3 and the second correction intensity data acquired in step S4.
- the second absorption rate is a relative value of the second correction intensity data with respect to the second reference intensity data.
- the second absorption rate is calculated based on the following formula (iii).
- Ar ′ 1 ⁇ Lb ′ / La ′ (iii)
- Ar ′ second absorption rate
- La ′ second reference intensity data
- Lb ′ second correction intensity data
- correction data ⁇ that is a ratio of these is calculated.
- the correction data ⁇ is correction values at a plurality of wavelengths.
- the correction data ⁇ is calculated, for example, according to the following equation (7).
- the first absorption rate Ar, the second absorption rate Ar ′, and the correction data ⁇ are calculated as values for each wavelength and stored in the storage unit 53.
- the measurement light L2 output from the integrating sphere 14 is detected by the spectroscopic detector 9, and the intensity data of the sample 1 at a plurality of wavelengths is output to the data analysis device 50.
- the intensity data acquisition unit 51 acquires the intensity data of the sample 1 and stores the intensity data in the storage unit 53.
- the optical characteristic calculation unit 54 calculates the internal quantum efficiency (luminescence quantum yield) of the sample 1. .
- the internal quantum efficiency can be calculated using a known calculation method. Then, the optical characteristic calculation unit 54 calculates the external quantum efficiency by the product of the calculated internal quantum efficiency and absorption rate.
- the optical characteristics can be obtained with high accuracy by using the area ratio correction value related to the beam cross section D of the excitation light L1 and the area ratio of the sample 1.
- the size of the beam cross section D differs depending on the wavelength because the characteristics of the optical element have wavelength dependency. Therefore, it is necessary to measure the area S 2 of the beam cross section D for each wavelength in order to calculate the area ratio correction value for each wavelength is not practical.
- first correction intensity data obtained by irradiating the first light absorbing member A with the excitation light L1 at a predetermined beam cross section D included in the first light absorbing member A is calculated based on the second correction intensity data obtained by irradiating the second light absorbing member B with the excitation light L1 at a predetermined beam cross section D including the second light absorbing member B. And stored in the storage unit 53. Then, the optical characteristics are calculated using the correction data ⁇ .
- the corrected data ⁇ from being found to correspond to the area ratio correction value, without measuring actual direct area S 2 of the beam cross section D of the excitation light L1, light The characteristics can be obtained with high accuracy.
- Rwg (S 1 / S 2 ) ⁇ Ra + ((S 2 ⁇ S 1 ) / S 2 ) ⁇ Rr (3)
- Rwg ′ Rwg / Rr (4)
- Ar ′ 1 ⁇ Rwg / Rr (5)
- the correction data ⁇ is correction values for a plurality of wavelengths. Accordingly, the correction data ⁇ can be suitably applied to the present embodiment in which the optical characteristics are calculated from the intensity data of the sample 1 at a plurality of wavelengths.
- the integrating sphere 14 is used as an integrator.
- the integrator may be an optical component that has a surface that diffusely reflects light inside and spatially integrates the light inside. That's fine.
- an integrating hemisphere disclosed in Japanese Patent Application Laid-Open No. 2009-103654 may be used.
- intensity data (spectral data) at a plurality of wavelengths is acquired and correction data ⁇ is calculated as a correction value at a plurality of wavelengths.
- intensity data at one wavelength is acquired and the correction data is stored at one wavelength. You may calculate as a correction value in.
- the internal quantum efficiency of the sample 1 may be calculated based on the intensity data of the sample 1 and the correction data ⁇ .
- the sample container 40 by the same configuration as the first correction member 70, the area S A of the area S 1 of the sample 1 so that a predetermined beam cross-section D is contained in the sample 1 first light-absorbing member A Is equal to Then, based on the first reference intensity data acquired in step S1, the intensity data of the sample 1 acquired in step S6, and the correction data ⁇ calculated in step S5, the light characteristic calculation unit 54 performs the sample 1
- the internal quantum efficiency may be calculated.
- the first and second light absorbing members A and B are made of different materials from the base materials (first and second correction substrates 71 and 81) of the first and second correction members 70 and 80. Any material that absorbs light as much as possible may be used.
- the first and second light absorbing members A and B are not particularly limited as long as they do not emit light. For example, by using a material having a high absorption rate for the first and second light absorbing members A and B, it is possible to easily calculate appropriate correction data ⁇ .
- the absorptance is calculated based on the intensity data of the sample 1 and the correction data ⁇ .
- the absorptivity is a parameter having a relationship between the reflectance and the front and back, and is synonymous with “1-reflectance”. Therefore, the reflectance may be calculated based on the intensity data of the sample 1 and the correction data ⁇ .
- the correction data is a correction calculated from a ratio between the first reflectance calculated based on the first correction intensity data and the second reflectance calculated based on the second correction intensity data. It may be a value.
- the first and second light absorbing members A and B are accommodated in the first and second correction accommodating portions 72 and 82 provided in the first and second correction members 70 and 80, respectively.
- the first and second light absorbing members A and B may be placed on the first and second correction substrates 71 and 81 without providing the first and second correction accommodating portions 72 and 82, respectively.
- the terms “same” and “equal” include, for example, “substantially the same” and “substantially equal”, respectively, and mean “substantially the same” and “substantially equal”, respectively.
- step S3 may not be performed, and the first reference intensity data acquired in step S1 may be used as the second reference intensity data.
- the steps S1, S2, S3, S4, and S6 are performed in this order. However, these steps may be performed in any order (the order is not specified).
- the step S5 may be performed in parallel with the execution of the above step S6, for example, if it is executed after the above steps S1 to S4 and before the above step S7.
- Steps S1 to S5 are not necessarily performed every time the optical characteristics of the sample 1 are measured.
- the correction data ⁇ may be acquired by performing the above steps S1 to S5 when the optical measuring device 100 is shipped from the factory, and stored in the storage unit 53 in advance. Further, for example, the above steps S1 to S5 may be performed at the time of calibration after a certain period of time.
- the area S 2 of the predetermined beam cross section D may be made larger than the area S 1 of the sample 1 so that the predetermined beam cross section D includes (covers) the sample 1. Moreover, than the area S A of the first light-absorbing member A to reduce the area S 2 of the predetermined beam cross-section D, (as covered) predetermined beam cross-section D is so enclosed in the sample 1 be constructed Good. Furthermore, than the area S B of the second light-absorbing member B by increasing the area S 2 of the predetermined beam cross-section D, predetermined beam cross-section D may be configured so as to include the sample 1. Such a configuration can be realized, for example, by adjusting at least one of the optical system of the excitation light L1 and the opening shapes of the housing portions 42, 72, and 82.
- DESCRIPTION OF SYMBOLS 1 ... Sample, 9 ... Spectral detector (light detector), 14 ... Integrating sphere (integrator), 53 ... Memory
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Abstract
Description
H=(S2/S1)×H´ …(i)
H:補正後の光特性,H´:補正前の光特性、
S1:試料の面積、S2:励起光における所定のビーム断面の面積
励起光における所定のビーム断面が試料を覆う場合、算出する吸収率又は反射率は真値に対して異なって見積もられる傾向があるところ、本発明の一側面によれば、当該補正データを用いて試料の強度データから試料の吸収率又は反射率を算出することで、励起光のビーム断面の面積を直接計測しなくとも、吸収率又は反射率を精度よく求めることが可能となる。
励起光における所定のビーム断面が試料に覆われる場合、算出する内部量子効率は真値に対して異なって見積もられる傾向があるところ、本発明の一側面によれば、当該補正データを用いて試料の強度データから試料の内部量子効率を算出することで、励起光のビーム断面の面積を直接計測しなくとも、内部量子効率を精度よく求めることが可能となる。
まず、第1補正部材70の第1補正用基板71のみ、つまり、第1光吸収部材Aが保持されていない第1補正部材70x(図6参照)を試料ホルダ24に載置し、当該試料ホルダ24を積分球14に取り付ける。この状態において、光発生部6で発生させた励起光L1を積分球14内に入力し、第1補正部材70xに所定のビーム断面Dで励起光L1を照射する。
続いて、第1光吸収部材Aが収容され保持された第1補正部材70y(図6参照)を試料ホルダ24に載置し、当該試料ホルダ24を積分球14に取り付ける。この状態において、光発生部6で発生させた励起光L1を積分球14内に入力し、第1補正部材70yに所定のビーム断面Dで励起光L1を照射する。このとき、第1光吸収部材Aには、第1光吸収部材Aが所定のビーム断面Dを内包するように励起光L1が照射される。
続いて、第2補正部材80の第2補正用基板81のみ、つまり、第2光吸収部材Bが保持されていない第2補正部材80x(図7参照)を試料ホルダ24に載置し、当該試料ホルダ24を積分球14に取り付ける。この状態において、光発生部6で発生させた励起光L1を積分球14内に入力し、第2補正部材80xに所定のビーム断面Dで励起光L1を照射する。
続いて、第2光吸収部材Bが収容され保持された第2補正部材80y(図7参照)を試料ホルダ24に載置し、当該試料ホルダ24を積分球14に取り付ける。この状態において、光発生部6で発生させた励起光L1を積分球14内に入力し、第2補正部材80yに所定のビーム断面Dで励起光L1を照射する。このとき、第2光吸収部材Bには、第2光吸収部材Bが所定のビーム断面Dに内包されるように励起光L1が照射される。
続いて、補正データ算出部52により、補正データを算出する。具体的には、上記ステップS1で取得した第1リファレンス強度データと、上記ステップS2で取得した第1補正用強度データとに基づいて、第1吸収率を算出する。第1吸収率は、第1リファレンス強度データに対する第1補正用強度データの相対値である。ここでは、第1吸収率は、下式(ii)に基づいて算出される。
Ar=1-Lb/La …(ii)
Ar:第1吸収率,La:第1リファレンス強度データ,Lb:第1補正用強度データ
Ar’=1-Lb’/La’ …(iii)
Ar’:第2吸収率,La’:第2リファレンス強度データ,
Lb’:第2補正用強度データ
続いて、試料1が収容され保持された試料容器40(図5参照)を試料ホルダ24に載置し、当該試料ホルダ24を積分球14に取り付ける。この状態において、光発生部6で発生させた励起光L1を積分球14内に入力し、試料容器40に所定のビーム断面Dで励起光L1を照射する。このとき、試料1には、試料1が所定のビーム断面Dに内包されるように励起光L1が照射される。
最後に、上記ステップS3で取得した第2リファレンス強度データと、上記ステップS6で取得した試料1の強度データと、上記ステップS5で算出した補正データαとに基づいて、光特性算出部54により試料1の吸収率を算出する。例えば、光特性算出部54においては、下式(iv)に従って、試料1の真の吸収率Qを算出する。なお、試料用基板41と第2補正用基板81とが同じであることから、ここでの試料容器40のリファレンス強度データとして、第2リファレンス強度データが用いられている。
Q=(1-Lb’/Lc)×α …(iv)
Ra’=Ra/Rr …(1)
Ar=1-Ra/Rr …(2)
Rwg=(S1/S2)×Ra+((S2-S1)/S2)×Rr …(3)
Rwg’=Rwg/Rr …(4)
Ar’=1-Rwg/Rr …(5)
Rwg/Rr=(S1/S2)×Ra/Rr+(S2-S1)/S2
Rwg/Rr=(S1/S2)×Ra/Rr+1-S1/S2
1-Rwg/Rr=(S1/S2)×(1-Ra/Rr) …(3A)
Ar’=(S1/S2)×Ar
Ar=(S2/S1)×Ar’ …(6)
S2/S1=Ar/Ar’=α …(7)
Claims (18)
- 試料に励起光を照射し、計測光を検出する光計測装置であって、
前記試料が配置される積分器と、
前記励起光を前記積分器内へ入力し、前記励起光を所定のビーム断面で前記試料に照射させる光学系と、
前記積分器から出力された計測光を検出し、1又は複数の波長における前記試料の強度データを出力する光検出器と、
補正データが記憶された記憶部と、
前記光検出器から出力された前記試料の強度データ及び前記記憶部に記憶された前記補正データに基づいて、前記試料の光特性を算出する光特性算出部と、を備え、
前記補正データは、
前記積分器に配置された第1光吸収部材に対して前記励起光を前記所定のビーム断面で照射した際に前記積分器から出力された第1計測光の検出値である第1補正用強度データと、前記積分器に配置された第2光吸収部材に対して前記励起光を前記所定のビーム断面で照射した際に前記積分器から出力された第2計測光の検出値である第2補正用強度データと、に基づいて算出された補正値であり、
前記励起光の前記所定のビーム断面は、
前記第1光吸収部材に覆われると共に、前記第2光吸収部材を覆う、光計測装置。 - 前記補正データは、前記第1補正用強度データに基づいて算出された第1吸収率と、前記第2補正用強度データに基づいて算出された第2吸収率と、の比から算出された補正値である、請求項1に記載の光計測装置。
- 前記補正データは、前記第1補正用強度データに基づいて算出された第1反射率と、前記第2補正用強度データに基づいて算出された第2反射率と、の比から算出された補正値である、請求項1に記載の光計測装置。
- 前記補正データは、複数の波長における補正値である、請求項1~3の何れか一項に記載の光計測装置。
- 前記第1光吸収部材及び前記第2光吸収部材は、同じ吸収率の材料で形成されている、請求項1~4の何れか一項に記載の光計測装置。
- 前記励起光の照射位置における前記試料の面積は、前記励起光の照射位置における前記第2光吸収部材の面積と等しく、
前記励起光の前記所定のビーム断面は、前記試料を覆い、
前記光特性算出部は、前記試料の強度データ及び前記補正データに基づいて、前記試料の吸収率又は反射率を前記光特性として算出する、請求項1~5の何れか一項に記載の光計測装置。 - 前記励起光の照射位置における前記試料の面積は、前記励起光の照射位置における前記第1光吸収部材の面積と等しく、
前記励起光の前記所定のビーム断面は、前記試料に覆われ、
前記光特性算出部は、前記試料の強度データ及び前記補正データに基づいて、前記試料の内部量子効率を前記光特性として算出する、請求項1~5の何れか一項に記載の光計測装置。 - 前記第1光吸収部材に覆われる前記所定のビーム断面は、前記励起光の照射位置において前記第1光吸収部材の面積よりも小さい面積を有し、
前記第2光吸収部材を覆う前記所定のビーム断面は、前記励起光の照射位置において前記第2光吸収部材の面積よりも大きい面積を有する、請求項1~7の何れか一項に記載の光計測装置。 - 試料に励起光を照射し、計測光を検出する光計測方法であって、
積分器に配置された第1光吸収部材に対して励起光を所定のビーム断面で照射し、第1補正用強度データを取得するために前記積分器から出力された第1計測光を検出する工程と、
前記積分器に配置された第2光吸収部材に対して前記励起光を前記所定のビーム断面で照射し、第2補正用強度データを取得するために前記積分器から出力された第2計測光を検出する工程と、
前記積分器に配置された前記試料に対して前記励起光を前記所定のビーム断面で照射し、1又は複数の波長における前記試料の強度データを取得するために前記積分器から出力された計測光を検出する工程と、
前記第1補正用強度データ及び前記第2補正用強度データに基づいて、補正データを算出する工程と、
前記試料の強度データ及び前記補正データに基づいて、前記試料の光特性を算出する工程と、を含み、
前記励起光の前記所定のビーム断面は、
前記第1光吸収部材に覆われると共に、前記第2光吸収部材を覆う、光計測方法。 - 前記補正データを算出する工程では、前記第1補正用強度データに基づいて算出された第1吸収率と、前記第2補正用強度データに基づいて算出された第2吸収率と、の比から前記補正データを算出する、請求項9に記載の光計測方法。
- 前記補正データを算出する工程では、前記第1補正用強度データに基づいて算出された第1反射率と、前記第2補正用強度データに基づいて算出された第2反射率と、の比から前記補正データを算出する、請求項9に記載の光計測方法。
- 前記補正データは、複数の波長における補正値である、請求項9~11の何れか一項に記載の光計測方法。
- 前記第1光吸収部材及び前記第2光吸収部材は、同じ吸収率の材料で形成されている、請求項9~12の何れか一項に記載の光計測方法。
- 前記励起光の照射位置における前記試料の面積は、前記励起光の照射位置における前記第2光吸収部材の面積と等しく、
前記励起光の前記所定のビーム断面は、前記試料を覆い、
前記試料の前記光特性を算出する工程では、前記試料の強度データ及び前記補正データに基づいて、前記試料の吸収率又は反射率を前記光特性として算出する、請求項9~13の何れか一項に記載の光計測方法。 - 前記励起光の照射位置における前記試料の面積は、前記励起光の照射位置における前記第1光吸収部材の面積と等しく、
前記励起光の前記所定のビーム断面は、前記試料に覆われ、
前記試料の前記光特性を算出する工程では、前記試料の強度データ及び前記補正データに基づいて、前記試料の内部量子効率を前記光特性として算出する、請求項9~13の何れか一項に記載の光計測方法。 - 前記第1光吸収部材に覆われる前記所定のビーム断面は、前記励起光の照射位置において前記第1光吸収部材の面積よりも小さい面積を有し、
前記第2光吸収部材を覆う前記所定のビーム断面は、前記励起光の照射位置において前記第2光吸収部材の面積よりも大きい面積を有する、請求項9~15の何れか一項に記載の光計測方法。 - 試料に励起光を照射し、計測光を検出する光計測装置であって、
前記試料が配置される積分器と、
前記励起光を前記積分器内へ入力し、前記励起光を所定のビーム断面で前記試料に照射させる光学系と、
前記積分器から出力された計測光を検出し、1又は複数の波長における前記試料の強度データを出力する光検出器と、
補正データが記憶された記憶部と、
前記光検出器から出力された前記試料の強度データ及び前記記憶部に記憶された前記補正データに基づいて、前記試料の光特性を算出する光特性算出部と、を備え、
前記補正データは、
前記積分器に配置された第1光吸収部材に対して前記励起光を前記所定のビーム断面で照射した際に前記積分器から出力された第1計測光の検出値である第1補正用強度データと、前記積分器に配置された第2光吸収部材に対して前記励起光を前記所定のビーム断面で照射した際に前記積分器から出力された第2計測光の検出値である第2補正用強度データと、に基づいて算出された補正値であり、
前記励起光の前記所定のビーム断面の面積は、
前記第1光吸収部材の面積より小さく、前記第2光吸収部材の面積より大きい、光計測装置。 - 試料に励起光を照射し、計測光を検出する光計測方法であって、
積分器に配置された第1光吸収部材に対して励起光を所定のビーム断面で照射し、第1補正用強度データを取得するために前記積分器から出力された第1計測光を検出する工程と、
前記積分器に配置された第2光吸収部材に対して前記励起光を前記所定のビーム断面で照射し、第2補正用強度データを取得するために前記積分器から出力された第2計測光を検出する工程と、
前記積分器に配置された前記試料に対して前記励起光を前記所定のビーム断面で照射し、1又は複数の波長における前記試料の強度データを取得する前記積分器から出力された計測光を検出する工程と、
前記第1補正用強度データ及び前記第2補正用強度データに基づいて、補正データを算出する工程と、
前記試料の強度データ及び前記補正データに基づいて、前記試料の光特性を算出する工程と、を含み、
前記励起光の前記所定のビーム断面の面積は、
前記第1光吸収部材の面積よりも小さく、前記第2光吸収部材の面積よりも大きい、光計測方法。
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