WO2016088574A1 - 分光測定装置および分光測定方法 - Google Patents
分光測定装置および分光測定方法 Download PDFInfo
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
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Definitions
- One aspect of the present invention relates to a spectroscopic measurement apparatus and a spectroscopic measurement method.
- a spectroscopic measurement technique that measures the luminous efficiency of a measurement object using an integrator and a spectroscopic detector.
- the integrator has an internal space in which the measurement object is disposed, a light input unit that inputs light output from the light source to the internal space, and a light output unit that outputs measured light from the internal space to the outside.
- the internal space of the integrator has a spherical shape, for example, and is covered with an inner wall surface having high reflectivity and excellent diffusibility.
- the internal space of the integrator is, for example, a hemispherical shape.
- the inner wall of the hemispherical part is a wall having high reflectivity and excellent diffusibility
- the flat part is a flat mirror having high reflectivity. It has become.
- the integrator can input the excitation light output from the light source into the internal space from the light input unit, and can multiplex diffusely reflect the excitation light in the internal space.
- the integrator can also diffusively reflect the generated light (for example, fluorescence) generated by irradiating the measurement object arranged in the internal space with the excitation light within the internal space. Then, the integrator outputs measured light from the internal space to the outside through the light output unit.
- the light to be measured is excitation light and / or generated light.
- the spectroscopic detector obtains spectral data by spectroscopically measuring the light to be measured output from the integrator.
- the spectroscopic detector splits the light to be measured into each wavelength component by a spectroscopic element such as a grating or a prism, and detects the intensity of the split light of each wavelength by an optical sensor.
- This optical sensor has a plurality of light receiving units arranged one-dimensionally, and by detecting the light intensity of the wavelength component by the light receiving unit corresponding to each wavelength, it is possible to acquire spectrum data of the light to be measured. it can. Then, by analyzing the spectrum data, it is possible to measure the light emission efficiency and the like of the measurement object without depending on the angular characteristics of the light emission of the measurement object.
- Examples of the measurement object in the spectroscopic measurement technique using an integrator include an organic EL (electroluminescence) material and a fluorescent material.
- the form of a measuring object is arbitrary, such as a solution, a thin film, and powder.
- the emission quantum yield is the ratio of the number of photons generated in the measurement object to the number of photons in the excitation light absorbed by the measurement object.
- a spectroscopic measurement technique using an integrator is suitably used when evaluating the light emission quantum yield of a measurement object.
- Upconversion luminescent materials have been conducted using such a spectroscopic measurement technique (see Non-Patent Document 1).
- upconversion light emission phenomenon light having a wavelength shorter than the wavelength of the excitation light (upconversion light) is generated.
- Upconversion is based on nonlinear optical phenomena such as multiphoton absorption and second and third harmonic generation, multistage excitation of rare earth elements, and triplet-triplet annihilation (TTA). It happens due to a phenomenon.
- Non-Patent Document 1 filters having different transmission characteristics are arranged on the optical path between the integrator and the spectroscopic detector at the time of excitation light measurement and at the time of up-conversion light measurement, The luminous efficiency of the up-conversion luminescent material that is the measurement object is measured.
- the present inventor has found that the up-conversion luminous efficiency measurement has the following problems.
- the up-conversion emission efficiency is small, when evaluating the emission quantum yield (internal quantum efficiency) where it is necessary to obtain both the absorbed excitation light intensity and the up-conversion light intensity, high-intensity excitation
- the spectral detector may be saturated by light, and the emission quantum yield may not be calculated.
- up-conversion luminescent materials there are materials that increase the luminescence quantum yield when the intensity density of the excitation light to be irradiated is increased.
- the spectroscopic detector may be saturated by high-intensity up-conversion light, and the emission quantum yield and the like may not be evaluated.
- Non-Patent Document 1 The up-conversion luminous efficiency measurement technique described in Non-Patent Document 1 is considered to be able to solve such a problem.
- the output from the integrator The measured light cannot be measured at once by the spectroscopic detector, and it takes time for measurement and the measurement time becomes longer.
- the measurement conditions are different between the excitation light measurement and the up-conversion light measurement, there is a possibility that the measurement accuracy of the light emission efficiency of the measurement object is deteriorated.
- An aspect of the present invention has been made to solve the above-described problems, and an object thereof is to provide a spectroscopic measurement apparatus and a spectroscopic measurement method capable of easily measuring upconversion light generation efficiency.
- a spectroscopic measurement device is a device that measures the luminous efficiency of a measurement object that outputs up-conversion light by inputting excitation light, and (1) an internal space in which the measurement object is disposed;
- An integrator having a light input unit for inputting excitation light from the outside to the internal space and a light output unit for outputting light from the internal space to the outside; and (2) the attenuation rate for the excitation light is greater than the attenuation rate for the up-conversion light.
- a filter unit that has a large transmission spectrum and attenuates the light output from the light output unit according to the transmission spectrum; and (3) spectral detection that obtains spectral spectrum data by splitting the light attenuated and output by the filter unit.
- an analysis unit that analyzes the light emission efficiency of the measurement object based on the transmission spectrum data and the spectral spectrum data.
- a spectroscopic measurement method includes an internal space in which a measurement object is disposed, a light input unit that inputs excitation light from the outside to the internal space, and a light output unit that outputs light from the internal space to the outside.
- a method for measuring the luminous efficiency of a measurement object that outputs up-conversion light in response to input of excitation light includes (1) an internal space in which the measurement object is arranged and excitation from the outside.
- An integrator having a light input unit that inputs light into the internal space and a light output unit that outputs light from the internal space to the outside is used.
- Excitation light is input from the light input unit of the integrator to the internal space.
- the light output from the light output unit is attenuated according to the transmission spectrum by the filter unit having a transmission spectrum in which the attenuation rate with respect to the excitation light is larger than the attenuation rate with respect to the up-conversion light, and (4) the spectral detector
- the spectrum output is attenuated by the filter unit to obtain spectral spectrum data
- the analysis unit analyzes the luminous efficiency of the measurement object based on the transmission spectrum data and the spectral spectrum data.
- the upconversion light generation efficiency can be easily measured.
- FIG. 1 is a diagram showing a configuration of the spectroscopic measurement apparatus 1.
- FIG. 2 is a diagram illustrating an example of a transmission spectrum of the filter unit attached to the filter attachment unit 25 of the integrator 20.
- FIG. 3 is a diagram illustrating an example of the filter set 60 attached to the filter attaching portion 25 of the integrator 20.
- FIG. 4 is a flowchart illustrating a procedure for evaluating the light emission quantum yield of the measurement object.
- FIG. 5 is a diagram illustrating an example of the spectral spectrum S R1 ( ⁇ ) corrected in step S14 and the spectral spectrum S S1 ( ⁇ ) corrected in step S17.
- FIG. 6 is a diagram illustrating a configuration of the spectroscopic measurement apparatus 2.
- FIG. 1 is a diagram showing the configuration of the spectrometer 1.
- the spectroscopic measurement apparatus 1 includes a light source 10, an input light guide 11, an integrator 20, an output light guide 30, a spectroscopic detector 40, an analysis unit 50, a display unit 51, and an input unit 52.
- the light source 10 outputs light to be input to the internal space 21 of the integrator 20.
- the light output from the light source 10 includes standard light for having a known spectrum and calibration of the sensitivity of the entire apparatus, and excitation light to be irradiated to the measurement object disposed in the internal space 21 of the integrator 20. Etc.
- the excitation light output from the light source 10 has a wavelength that can cause an upconversion light emission phenomenon in the measurement object.
- the wavelength of the light output from the light source 10 may be variable.
- the light source 10 is a laser diode that outputs laser light having a wavelength of 980 nm, for example.
- the light source 10 may include an ND filter and a relay optical system.
- the input light guide 11 guides the light output from the light source 10 to the light input unit 22 of the integrator 20.
- the integrator (optical integrator) 20 includes an internal space 21 in which the measurement object is optically arranged, and light (input light) output from the light source 10 and guided by the input light guide 11 to the internal space 21.
- the internal space 21 has a spherical shape and is covered with an inner wall surface having high reflectivity and excellent diffusibility.
- the sample attaching part 24 arrange
- the filter attaching part 25 is provided in the light output part 23, and arrange
- the integrator 20 can input the light output from the light source 10 into the internal space 21 from the light input unit 22, and can multiplex diffusely reflect the light in the internal space 21. Further, the integrator 20 can also multiplex diffusely reflect the generated light (up-conversion light in this embodiment) generated by the measurement object arranged in the internal space 21 in the internal space 21.
- the integrator 20 outputs the light to be measured from the internal space 21 through the light output unit 23 to the outside.
- the light to be measured is light input from the light source 10 to the internal space 21 and / or up-conversion light generated from the measurement object.
- a sample container holding a measurement object that outputs up-conversion light by input of excitation light is attached to the sample attachment portion 24.
- a solution sample cell made of a transparent material for example, quartz glass or plastic
- the object to be measured is a solid such as a powder or thin film
- a solid sample cell or a solid sample container made of a transparent material for example, quartz glass or plastic
- metal that transmits light
- the measurement object is not limited to being completely disposed in the internal space 21 of the integrator 20, and a part of the measurement object may be disposed in the internal space 21 of the integrator 20.
- a sample arranged outside the inner wall of the integrator 20 may be optically arranged in the internal space 21 of the integrator 20 using an optical attachment attached to the sample attaching portion 24.
- the output light guide 30 guides the light output from the light output unit 23 of the integrator 20 and attenuated by the filter unit to the spectroscopic detector 40.
- the spectroscopic detector 40 receives the light guided by the output light guide 30 and separates the light to obtain spectral data.
- the spectroscopic detector 40 splits input light into each wavelength component using a spectroscopic element such as a grating or a prism, and detects the intensity of the split light of each wavelength by an optical sensor.
- This optical sensor has a plurality of light receiving units arranged one-dimensionally, and by detecting the light intensity of the wavelength component by the light receiving unit corresponding to each wavelength, it is possible to acquire spectrum data of the light to be measured. it can.
- the optical sensor of the spectroscopic detector 40 is a CCD linear image sensor or a CMOS linear image sensor formed on a silicon substrate, and has sensitivity to light having a wavelength of 350 nm to 1100 nm.
- the optical sensor of the spectroscopic detector 40 is an InGaAs linear image sensor, and has sensitivity to light with a wavelength of 900 nm to 1650 nm.
- the spectroscopic detector 40 is preferably capable of variably setting the measurement time (exposure time), and is preferably set appropriately according to the sensitivity of the optical sensor.
- the analysis unit (analyzer) 50 inputs the spectrum data acquired by the spectrum detector 40 and analyzes the spectrum data. Details of the analysis will be described later.
- the analysis unit 50 includes a storage unit (storage) that stores input spectrum data, analysis results, and the like. Further, the analysis unit 50 may control the light source 10 and the spectral detector 40.
- the analysis unit 50 is a computer including a processor and a memory. The analysis unit 50 performs various types of analysis and control by the processor. Examples of such a computer include a personal computer and a tablet terminal.
- the analysis unit 50 can be integrated with the display unit 51 and the input unit 52.
- the display unit (display) 51 displays the spectrum data input by the analysis unit 50, and also displays the analysis result by the analysis unit 50.
- the input unit 52 is, for example, a keyboard or a mouse.
- the input unit 52 receives an input instruction from an operator who performs spectroscopic measurement using the spectroscopic measurement apparatus 1, and inputs the input information (for example, measurement conditions and display conditions) to the analysis unit 50. give.
- FIG. 2 is a diagram illustrating an example of a transmission spectrum of the filter unit attached to the filter attachment unit 25 of the integrator 20.
- the attenuation rate in the excitation light wavelength region (the wavelength region including 980 nm) is larger than the attenuation rate in the up-conversion light wavelength region.
- the filter unit attenuates the light output from the light output unit 23 according to such a transmission spectrum.
- the filter unit includes, for example, a first filter that selectively attenuates excitation light on the long wavelength side of excitation light and up-conversion light, and a second filter that attenuates both excitation light and up-conversion light. Can be configured.
- the first filter may be a short pass filter or a band pass filter.
- the second filter may be an ND filter or may be composed of a light reflecting material.
- Spectralon registered trademark
- Spectralon which is a material having high reflectivity and excellent diffusibility provided on the inner wall surface of the integrator 20
- Spectralon has a substantially constant reflectivity over a wide wavelength range from the visible range to the near infrared range.
- a Spectralon filter in which Spectralon is formed into a sheet shape can be used as the second filter.
- Such a Spectralon filter can be used not only as the second filter but also as a part that diffusely reflects light as a part of the inner wall surface of the integrator 20. That is, the second filter may be made of the same material as the light reflecting material provided on the inner wall surface of the integrator 20.
- the filter mounting portion 25 of the integrator 20 is preferably exchangeable on the optical path with a filter portion having a transmission spectrum as shown in FIG. 2 and another filter having a transmission spectrum.
- FIG. 3 is a diagram illustrating an example of the filter set 60 attached to the filter attaching portion 25 of the integrator 20.
- the filter set 60 includes a filter unit 61 having a transmission spectrum as shown in FIG. 2, a short pass filter 62 that selectively attenuates excitation light out of excitation light and up-conversion light, and an opening (no filter). 63 are arranged in parallel. By sliding the filter set 60 in the filter mounting portion 25, the opening 63 or any one of the filters can be arranged on the optical path.
- the filter part 61, the short pass filter 62, and the opening part 63 are arranged on the circumference, and the opening part 63 or any one of the filters can be arranged on the optical path by rotating. It is good also as a structure.
- the filter mounting part 25 and the filter set 60 may be provided in the light output part 23 of the integrator 20, or may be provided in the light input part of the spectroscopic detector 40. What is necessary is just to be provided on the optical path between the output part 23 and the optical input part of the spectroscopic detector 40.
- the spectroscopic measurement method of the present embodiment performs spectroscopic measurement using the spectroscopic measurement apparatus 1 described above.
- the light emission quantum yield of the up-conversion light-emitting material that is the measurement object is obtained by the procedure according to the flow shown in FIG.
- step S11 a standard light source is used as the light source 10, standard light with a known spectrum is input to the integrator 20, and the light output from the integrator 20 at that time is spectrally separated by the spectroscopic detector 40. , The sensitivity calibration of the spectroscopic detector 40 is performed. In each subsequent step, a spectrum after this sensitivity calibration is obtained.
- the spectrum after this sensitivity calibration is a spectrum with the vertical axis representing the number of photons and the horizontal axis representing the wavelength.
- step S12 the transmission spectrum of the filter unit 61 is measured. At this time, the measurement object is not arranged in the internal space 21 of the integrator 20.
- the filter unit 61 or the opening (no filter) 63 is arranged on the optical path in the filter mounting unit 25, the standard light is input to the integrator 20, and the light output from the integrator 20 at that time is spectrally detected. The spectrum is obtained by spectroscopic analysis using the instrument 40.
- Spectral data acquired by the spectral detector 40 when the filter unit 61 is disposed on the optical path is S 1 ( ⁇ )
- spectral data acquired by the spectral detector 40 when the opening 63 is disposed on the optical path Is S 0 ( ⁇ ), and the exposure time is the same
- the transmission spectrum data T ( ⁇ ) of the filter unit 61 is obtained by the following equation (1).
- ⁇ is a wavelength.
- the transmission spectrum data T ( ⁇ ) is stored in the storage unit of the analysis unit 50.
- T ( ⁇ ) S 1 ( ⁇ ) / S 0 ( ⁇ ) (1)
- step S ⁇ b> 13 a reference measurement is performed using an excitation light source as the light source 10 without placing a measurement object in the internal space 21 of the integrator 20.
- the measurement object is placed in the inner space 21 in the sample measurement in step S16 described later, the container is placed in the inner space 21 in the reference measurement in step S13.
- the In the filter mounting portion 25, the filter portion 61 is placed on the optical path, and excitation light is input to the integrator 20. Then, the light output from the integrator 20 and transmitted through the filter unit 61 is received by the spectroscopic detector 40 to acquire spectroscopic spectrum data S R0 ( ⁇ ).
- step S14 the analysis unit 50 divides the spectrum data S R0 ( ⁇ ) acquired in step S13 by the transmission spectrum data T ( ⁇ ) acquired in step S12 (the following equation (2)). Spectral spectrum data S R1 ( ⁇ ) after correction is obtained (FIG. 5). The corrected spectral data S R1 ( ⁇ ) is spectral data before attenuation by the filter unit 61.
- S R1 ( ⁇ ) S R0 ( ⁇ ) / T ( ⁇ ) (2)
- the reciprocal of the transmission spectrum data T ( ⁇ ) acquired in step S12 is calculated as a correction coefficient K ( ⁇ ), and the correction coefficient K ( ⁇ ) is added to the spectral spectrum data S R0 ( ⁇ ) acquired in step S13.
- the spectral data S R1 ( ⁇ ) after correction may be obtained by multiplying.
- the correction coefficient K ( ⁇ ) may be stored in the storage unit of the analysis unit 50.
- step S15 the analysis unit 50 obtains the number of photons I R1 in the excitation light wavelength region and the number of photons I R2 in the up-conversion light wavelength region based on the spectral data S R1 ( ⁇ ) obtained in step S14.
- the photon number I R1 in the excitation light wavelength region can be obtained as an integral value of the spectral spectrum data S R1 ( ⁇ ) over the excitation light wavelength region.
- the photon number I R2 in the up-conversion light wavelength region can be obtained as an integral value of the spectral spectrum data S R1 ( ⁇ ) over the up-conversion light wavelength region.
- the number of photons obtained thereafter can be obtained as an integral value of spectrum data over a predetermined wavelength range.
- step S ⁇ b> 16 sample measurement is performed using an excitation light source as the light source 10 and a measurement object placed in the internal space 21 of the integrator 20.
- the filter portion 61 is placed on the optical path, and excitation light is input to the integrator 20.
- the light output from the integrator 20 and transmitted through the filter unit 61 is received by the spectroscopic detector 40 to acquire spectroscopic spectrum data S S0 ( ⁇ ).
- step S17 the analysis unit 50 divides the spectral spectrum data S S0 ( ⁇ ) acquired in step S16 by the transmission spectral data T ( ⁇ ) acquired in step S12 (the following equation (3)), The corrected spectral data S S1 ( ⁇ ) is obtained (FIG. 5).
- This corrected spectral data S S1 ( ⁇ ) is spectral data before attenuation by the filter unit 61.
- S S1 ( ⁇ ) S S0 ( ⁇ ) / T ( ⁇ ) (3)
- the corrected spectral data S S1 ( ⁇ ) may be obtained by multiplying the spectral data S S0 ( ⁇ ) acquired in step S16 by the correction coefficient K ( ⁇ ).
- step S18 the analysis unit 50 obtains the number of photons I S1 in the excitation light wavelength region and the number of photons I S2 in the up-conversion light wavelength region based on the spectral data S S1 ( ⁇ ) obtained in step S17.
- the excitation light wavelength range and the up-conversion light wavelength range in steps S15 and S18 may be set by the user of the spectroscopic measurement apparatus 1 by the input unit 52, or based on the spectral spectrum data obtained in steps S14 and S17. Then, the analysis unit 50 may set it automatically.
- the excitation light wavelength region in step S15 and the excitation light wavelength region in step S18 are the same wavelength region.
- the up-conversion light wavelength region in step S15 and the up-conversion light wavelength region in step S18 are the same wavelength region.
- step S19 the analysis unit 50, the number of photons I R2 of the number of photons I R1 and upconversion wavelength region of the excitation light wavelength range obtained in step S15, and, number of photons I of the excitation light wavelength range obtained in step S18 Based on S1 and the number of photons I S2 in the up-conversion light wavelength region, a light emission quantum yield PLQY (Photoluminescence Quantum Yield) is obtained by the following equation (4).
- the analysis unit 50 can also determine the external quantum efficiency from the product of the absorption rate of the measurement object and the internal quantum yield PLQY.
- PLQY (I S2 ⁇ I R2 ) / (I R1 ⁇ I S1 ) (4)
- step S12 transmission spectrum measurement
- step S13 reference measurement
- step S16 sample measurement
- Steps S11 and S12 may be performed before the spectrometer 1 is shipped from the factory, and steps S13 to S19 may be performed by the user of the spectrometer 1 after the factory. The results obtained in steps S11 and S12 may be used for each subsequent measurement. Steps S11 and S12 may be performed every time prior to steps S13 to S19.
- the excitation light and the up-conversion light output from the integrator 20 are appropriately attenuated by the same filter unit 61 and input to the spectral detector 40,
- the number of photons in the excitation light wavelength region and the number of photons in the up-conversion light wavelength region are obtained based on the spectrum data acquired by the spectrum detector 40. Therefore, the up-conversion light generation efficiency can be easily measured with the same number of measurements and the same measurement conditions.
- the filter unit 61 includes a first filter that selectively attenuates the excitation light of the excitation light and the up-conversion light, and a second filter that attenuates both the excitation light and the up-conversion light. Therefore, since the filter unit 61 attenuates the light output from the light output unit 23 by both the first filter and the second filter, both the excitation light and the up-conversion light can be attenuated, and the up-conversion light generation efficiency can be reduced. It can be measured with high accuracy.
- the filter set 60 having the filter part 61 and the opening part 63 enables switching so that either the filter part 61 or the opening part 63 receives the light output from the light output part 23, and the transmission spectrum of the filter. Measurement and upconversion light generation efficiency can be easily measured. Furthermore, since the second filter is made of the same material as the light reflecting material provided on the inner wall of the integrator 20, it is difficult to affect the measurement of the upconversion light generation efficiency.
- FIG. 6 is a diagram illustrating a configuration of the spectroscopic measurement apparatus 2.
- the integrator 20 of the spectrometer 1 shown in FIG. 1 is an integrating sphere
- the integrator 20 of the spectrometer 2 shown in FIG. 6 is an integrating hemisphere.
- the internal space 21 of the integrator 20 has a hemispherical shape
- the inner wall of the hemispherical part is a wall having high reflectivity and excellent diffusibility
- the flat part is a flat mirror having high reflectivity.
- the light input unit 22 and the light output unit 23 may be provided at any location of the hemispherical part and the flat part. Even when this spectrometer 2 is used, the upconversion light generation efficiency can be easily measured in the same manner as described above.
- the spectral spectral data is corrected based on the transmission spectral data, and the light emission efficiency is measured based on the spectral data after the correction, but the quantum yield (internal quantum efficiency) Luminous efficiency such as external quantum efficiency may be obtained and the luminous efficiency may be corrected based on transmission spectrum data.
- the spectral data is not limited to data indicating the number of photons for each wavelength, but may be data indicating the detection intensity for each wavelength. In this case, the photon numbers I S1 and I R1 in the excitation light wavelength region and the photon numbers I S2 and I R2 in the up-conversion light wavelength region may be obtained from data indicating the detection intensity for each wavelength.
- the spectroscopic measurement device is a device that measures the luminous efficiency of a measurement object that outputs up-conversion light by inputting excitation light, and includes (1) an internal space in which the measurement object is disposed, and an external An integrator having a light input unit that inputs pumping light from the internal space to the internal space and a light output unit that outputs light from the internal space to the outside; A filter unit having a transmission spectrum and attenuating the light output from the light output unit according to the transmission spectrum; and (3) a spectral detector for obtaining spectral spectrum data by dispersing the light attenuated and output by the filter unit. And (4) an analysis unit that analyzes the light emission efficiency of the measurement object based on the transmission spectrum data and the spectral spectrum data. .
- the spectroscopic measurement method is a method for measuring the luminous efficiency of a measurement object that outputs up-conversion light by inputting excitation light, and includes (1) an internal space in which the measurement object is disposed, and an external Using an integrator having a light input unit for inputting pumping light from the internal space to the internal space and a light output unit for outputting light from the internal space to the outside, and (2) pumping light from the light input unit of the integrator to the internal space.
- the light output from the light output unit is attenuated according to the transmission spectrum by the filter unit having a transmission spectrum whose attenuation rate with respect to the excitation light is larger than the attenuation rate with respect to the up-conversion light, and (4) the spectral detector Then, spectral data is obtained by dispersing the light attenuated and output by the filter unit, and (5) the transmission spectral data and the spectral spectrum are obtained by the analyzing unit. Based on Rudeta is configured to analyze the light emission efficiency of the measurement object.
- the spectroscopic measurement apparatus having the above configuration further includes a filter set having a filter unit and an opening, and the filter set is configured to be switchable so that the filter unit or the opening receives light output from the light output unit. Also good. Further, the spectroscopic measurement method having the above-described configuration may be configured such that the filter unit or the opening is switched to receive light output from the light output unit by a filter set having the filter unit and the opening.
- the filter unit includes a first filter that selectively attenuates excitation light among the excitation light and up-conversion light, a second filter that attenuates both excitation light and up-conversion light, It is good also as a structure containing. In this case, it is preferable that the light output from the light output unit is attenuated by both the first filter and the second filter.
- the second filter may be an ND filter or a light reflecting material.
- the light reflecting material may be the same material as the light reflecting material provided on the inner wall of the integrator.
- the first filter may be a short pass filter or a band pass filter.
- the analysis unit may correct the spectroscopic spectrum data based on the transmission spectrum data and analyze the light emission efficiency of the measurement object based on the corrected spectroscopic data.
- the analysis unit may correct the spectroscopic spectrum data based on the transmission spectrum data, and analyze the light emission efficiency of the measurement object based on the corrected spectroscopic spectrum data.
- the present invention can be used as a spectroscopic measurement apparatus and a spectroscopic measurement method capable of easily measuring the upconversion light generation efficiency.
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Abstract
Description
T(λ)=S1(λ)/S0(λ) …(1)
SR1(λ)=SR0(λ)/T(λ) …(2)
SS1(λ)=SS0(λ)/T(λ) …(3)
PLQY=(IS2-IR2)/(IR1-IS1) …(4)
Claims (16)
- 励起光の入力によりアップコンバージョン光を出力する測定対象物の発光効率を測定する装置であって、
前記測定対象物が配置される内部空間と、外部から前記励起光を前記内部空間に入力する光入力部と、前記内部空間から光を外部へ出力する光出力部とを有する積分器と、
前記励起光に対する減衰率が前記アップコンバージョン光に対する減衰率より大きい透過スペクトルを有し、前記光出力部から出力される光を前記透過スペクトルに従って減衰させるフィルタ部と、
前記フィルタ部により減衰されて出力される光を分光して分光スペクトルデータを取得する分光検出器と、
前記透過スペクトルデータ及び前記分光スペクトルデータに基づいて前記測定対象物の発光効率を解析する解析部と、
を備える分光測定装置。 - 前記フィルタ部と開口部とを有するフィルタセットを更に備え、前記フィルタセットは、前記フィルタ部または前記開口部が前記光出力部から出力される光を受けるように切替可能に構成される、請求項1に記載の分光測定装置。
- 前記フィルタ部が、前記励起光および前記アップコンバージョン光のうち前記励起光を選択的に減衰させる第1フィルタと、前記励起光および前記アップコンバージョン光の双方を減衰させる第2フィルタと、を含み、前記光出力部から出力される光を前記第1フィルタおよび前記第2フィルタの両方によって減衰させる、請求項1または2に記載の分光測定装置。
- 前記第2フィルタがNDフィルタである、請求項3に記載の分光測定装置。
- 前記第2フィルタが光反射物質で構成されたものである、請求項3に記載の分光測定装置。
- 前記光反射物質は、前記積分器の内壁に設けられた光反射物質と同じ材料である、請求項5に記載の分光測定装置。
- 前記第1フィルタがショートパスフィルタまたはバンドパスフィルタである、請求項3~6の何れか一項に記載の分光測定装置。
- 前記解析部は、前記透過スペクトルデータに基づいて前記分光スペクトルデータを補正し、当該補正後の分光スペクトルデータに基づいて前記測定対象物の発光効率を解析する、請求項1~7の何れか一項に記載の分光測定装置。
- 測定対象物が配置される内部空間と、外部から励起光を前記内部空間に入力する光入力部と、前記内部空間から光を外部へ出力する光出力部とを有する積分器を用いて、前記励起光の入力によりアップコンバージョン光を出力する前記測定対象物の発光効率を測定する方法であって、
前記励起光を前記積分器の前記光入力部から前記内部空間に入力させ、
前記励起光に対する減衰率が前記アップコンバージョン光に対する減衰率より大きい透過スペクトルを有するフィルタ部により、前記光出力部から出力される光を前記透過スペクトルに従って減衰させ、
分光検出器により、前記フィルタ部により減衰されて出力される光を分光して分光スペクトルデータを取得し、
解析部により、前記透過スペクトルデータ及び前記分光スペクトルデータに基づいて前記測定対象物の発光効率を解析する、
分光測定方法。 - 前記フィルタ部と開口部とを有するフィルタセットにより、前記フィルタ部または前記開口部が前記光出力部から出力される光を受けるように切替える、請求項9に記載の分光測定方法。
- 前記フィルタ部が、前記励起光および前記アップコンバージョン光のうち前記励起光を選択的に減衰させる第1フィルタと、前記励起光および前記アップコンバージョン光の双方を減衰させる第2フィルタと、を含み、前記光出力部から出力される光を前記第1フィルタおよび前記第2フィルタの両方によって減衰させる、請求項9または10に記載の分光測定方法。
- 前記第2フィルタがNDフィルタである、請求項11に記載の分光測定方法。
- 前記第2フィルタが光反射物質で構成されたものである、請求項11に記載の分光測定方法。
- 前記光反射物質は、前記積分器の内壁に設けられた光反射物質と同じ材料である、請求項13に記載の分光測定方法。
- 前記第1フィルタがショートパスフィルタまたはバンドパスフィルタである、請求項11~14の何れか一項に記載の分光測定方法。
- 前記解析部により、前記透過スペクトルデータに基づいて前記分光スペクトルデータを補正し、当該補正後の分光スペクトルデータに基づいて前記測定対象物の発光効率を解析する、請求項9~15の何れか一項に記載の分光測定方法。
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US10036706B2 (en) | 2018-07-31 |
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