CN107611275B - A kind of white luminous device, display device and preparation method thereof - Google Patents
A kind of white luminous device, display device and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to field of display technology more particularly to a kind of white luminous device, display devices and preparation method thereof.White luminous device of the invention includes first electrode, the second electrode relative to first electrode and the first luminescent layer and the second luminescent layer that are set between first electrode and second electrode, doped with the first blue light emitting material and red emitting material in first luminescent layer, the second luminescent layer is interior doped with the second blue light emitting material and green light luminescent material；Two kinds of blue light emitting materials are the phosphor material of different luminescence bands, the transmitting main peak of second blue light emitting material and the absorption spectrum of green light luminescent material, which exist, to partly overlap, so as to reduce the loss of energy transmission, luminous efficiency is improved, and then obtains a kind of white luminous device efficiently, stable, excitation purity is high.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of white luminous device, display device and its production sides
Method.
Background technique
Organic electroluminescent LED (Organic Light Emitting Diode, OLED) technology was nearly 20 years in the past
Between attracted extensive research attention and achieve significant progress, it is at low cost, the response time is short, brightness is high, visual angle is wide, drives
Dynamic voltage is low and can realize that the advantages such as Flexible Displays become the plate full-color EL display technology in broad development space.
As the performance of monochromatic OLED graduallys mature, white light organic electroluminescence diode (white Organic Light
Emitting Diode, WOLED) as a kind of novel solid state light emitter, show in terms of illumination and plate
Good application prospect, has attracted people more and more to pay attention to.With the continuous deepening of research and develop, the effect of WOLED
Rate and performance have obtained raising at full speed.The application of organic electromechanical phosphorescent material is so that the efficiency of WOLED realizes a leap.
The verified whole excitons that can use singlet and triplet state of organic electrophosphorescenpolymer, theoretically highest internal quantum efficiency is reachable
To 100%.Therefore, the research center of WOLED gradually turns to phosphorescence WOLED from fluorescence WOLED.
Statistical theory is generated according to random exciton, the internal quantum efficiency of fluorescence OLED is limited in 25% hereinafter, therefore making
With fluorescent material is used, efficiency is too low, and using phosphorescent light-emitting materials, efficiency is higher.The general red light-emitting in industrialization device
Material, Yellow light emitting material and yellow green-emitting luminescent material gloss phosphor material, blue light emitting material use fluorescent material.So this
A little WOLED devices will appear blue light low efficiency, and feux rouges, yellow light and yellowish green light efficiency are higher, in the case where lighting for a long time, blue light
It is asynchronous with the life time decay of green-yellow light, cause colour cast to change over time.
Summary of the invention
In view of this, the present invention provides a kind of white luminous device, the production method of white luminous device and organic hair
Electro-optical display device.
In a first aspect, the embodiment of the present invention provides a kind of white luminous device, include:
First electrode, relative to the first electrode second electrode and be set to the first electrode and described second
The first luminescent layer and the second luminescent layer between electrode, first luminescent layer are interior doped with the first blue light emitting material and feux rouges
Luminescent material, second luminescent layer are interior doped with the second blue light emitting material and green light luminescent material；
First blue light emitting material and second blue light emitting material are blue emitting phosphor material, and described second is blue
The absorption spectrum for emitting main peak and the green light luminescent material of light luminescent material is in wave-length coverage within the scope of 400~480nm
In the presence of overlapping, the hair of the wavelength of the transmitting main peak of first blue light emitting material than second blue light emitting material
Penetrate at least big 4nm of wavelength of main peak.
Second aspect, the embodiment of the present invention also provide a kind of display device, send out comprising white described in above-mentioned first aspect
Optical device.
The third aspect, the embodiment of the present invention also provide a kind of preparation method of white luminous device comprising the steps of:
First electrode layer is formed on the substrate；
The first luminescent layer is formed in the first electrode layer, is then formed second on first luminescent layer and is shone
Layer, finally forms the second electrode lay on second luminescent layer；Or
The second luminescent layer is formed in the first electrode layer, is then formed first on second luminescent layer and is shone
Layer, finally forms the second electrode lay on first luminescent layer；
Doped with the first blue light emitting material and red emitting material in first luminescent layer, in second luminescent layer
Doped with the second blue light emitting material and green light luminescent material, first blue light emitting material and the second blue light emitting material
Material is blue emitting phosphor material, the absorption spectrum of the transmitting main peak and the green light luminescent material of second blue light emitting material
It partly overlaps in maximum absorption band of the wave-length coverage within the scope of 350~500nm, the transmitting master of first blue light emitting material
The wavelength at peak is 4nm at least bigger than the wavelength of the transmitting main peak of second blue light emitting material.
Technical solution of the present invention at least has following beneficial effect:
White luminous device of the invention is all made of doping by using double emitting layers, the luminescent material of each luminescent layer
Form, wherein doped with the first blue light emitting material and red emitting material in the first luminescent layer, in the second luminescent layer doped with
Second blue light emitting material and green light luminescent material, thus make the first luminescent layer transmitting blue light and feux rouges, the transmitting of the second luminescent layer
Blue light and green light.Wherein, the first blue light emitting material and the second blue light emitting material are blue emitting phosphor material, two kinds of blue light hairs
Luminescent material is the material of different luminescence bands, and the wavelength of the transmitting main peak of the first blue light emitting material is than the second blue light emitting material
Transmitting main peak at least big 4nm of wavelength.And the absorption of the transmitting main peak and green light luminescent material of the second blue light emitting material
Spectrum exists within the scope of 350~500nm in wave-length coverage to overlap, and so as to reduce the loss of energy transmission, improves
Luminous efficiency.To obtain, a kind of color is efficient, stablizes, the white luminous device of purity is high.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field
For those of ordinary skill, without any creative labor, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a kind of structural schematic diagram of white luminous device provided in an embodiment of the present invention；
Fig. 2 be it is provided in an embodiment of the present invention another white luminous device structural schematic diagram；
Fig. 3 be it is provided in an embodiment of the present invention another white luminous device structural schematic diagram；
Fig. 4 be it is provided in an embodiment of the present invention another white luminous device structural schematic diagram；
Fig. 5 be it is provided in an embodiment of the present invention another white luminous device structural schematic diagram；
Fig. 6 is a kind of structural schematic diagram of display device provided in an embodiment of the present invention；
Fig. 7 is a kind of flow diagram of white luminous device production method provided in an embodiment of the present invention；
Fig. 8 is the flow diagram of another white luminous device production method provided in an embodiment of the present invention；
Fig. 9 is the absorption of the transmitting main peak and green light luminescent material of the second blue light emitting material provided in an embodiment of the present invention
Spectrum.
Wherein:
1- luminescent device；
10- first electrode；
The first luminescent layer of 11-；
The first luminescent layer of 12-；
13- hole transmission layer；
14- electron transfer layer；
15- hole injection layer
16- electron injecting layer；
17- hole blocking layer；
18- electronic barrier layer；
20- second electrode；
The transmitting main peak of the second blue light emitting material of 100-；
The absorption spectrum of 200- green light luminescent material.
Specific embodiment
For a better understanding of the technical solution of the present invention, being retouched in detail to the embodiment of the present invention with reference to the accompanying drawing
It states.
It will be appreciated that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The present invention.In the embodiment of the present invention and the "an" of singular used in the attached claims, " described " and "the"
It is also intended to including most forms, unless the context clearly indicates other meaning.
The embodiment of the present invention provides a kind of white luminous device, and structural schematic diagram is as shown in Fig. 1~5.Wherein, such as Fig. 1
With shown in Fig. 2, white luminous device 1 includes: first electrode 10, relative to first electrode 10 second electrode 20 and be set to
The first luminescent layer 11 and the second luminescent layer 12 between first electrode 10 and second electrode 20, the first luminescent layer 11 and second shine
The position of layer 12 can be interchanged.
Wherein, doped with the first blue light emitting material and red emitting material in the first luminescent layer, so as to emit blue light
And feux rouges, the second luminescent layer is interior doped with the second blue light emitting material and green light luminescent material, so as to emit blue light and green light,
It is compound with the blue light and feux rouges of the first luminescent layer, white light is generated, to obtain white light emitting device.In the embodiment of the present invention
One luminescent layer and the second luminescent layer are connected directly, can be by the Mixed Circumscription of hole and electronics in the light emitting region of two luminescent layers
It is interior, and with the variation of operating voltage, luminous zone will not vary widely, so that it is good to guarantee that white light emitting device has
It is colour-stable.
In the embodiment of the present application, the first blue light emitting material, the second blue light emitting material are blue emitting phosphor material, phase
For fluorescence luminescent material, the blue light material of the embodiment of the present invention selects phosphor material, overcomes blue-light fluorescent material
The life time decay of the blue light low efficiency of white luminous device, blue light and green-yellow light is asynchronous, so as to cause the defect of colour cast, and
It is greatly improved the luminous efficiency of white light emitting device.
In embodiments of the present invention, there is the visible spectrum in 600nm~700nm in the emission spectrum of red emitting material
Peak wavelength, there is in the emission spectrum of green light luminescent material the peak wavelength in the visible spectrum of 500nm~600nm, it is blue
There is the peak wavelength in the visible spectrum of 400nm~500nm in the emission spectrum of light luminescent material.It is further alternative, it is red
There is the peak wavelength in the visible spectrum of 610nm~640nm, the hair of green light luminescent material in the emission spectrum of light luminescent material
The peak wavelength having in the visible spectrum of 510nm~550nm is penetrated in spectrum, is had in the emission spectrum of blue light emitting material
The peak wavelength of the visible spectrum of 400nm~480nm.
In the embodiment of the present invention, the first blue light emitting material transmitting main peak wavelength than the second blue light emitting material hair
Penetrate at least big 4nm of wavelength of main peak.That is, the wavelength of the transmitting main peak of the second blue light emitting material is shorter, according to its visible spectrum
In emission wavelength, be a kind of navy blue luminescent material；The wavelength of the transmitting main peak of first blue light emitting material is longer, according to it
Emission wavelength in visible spectrum is a kind of sky blue luminescent material.This is because, the luminous efficiency of blue emitting phosphor material is lower,
The life time decay of blue light and green-yellow light is asynchronous, so as to cause the defect of colour cast.In view of this, the embodiment of the present invention is sent out in white
Optical device has used two kinds of blue emitting phosphor materials to make white luminous device to compensate for the defect of blue emitting phosphor material simultaneously
With good excitation purity.
For the difference of the dark blue luminescent material of clearer explanation and the luminescent spectrum of day blue light material, in the embodiment of the present invention
In, the wavelength of the transmitting main peak of the second blue light emitting material is defined as λ2, by the transmitting main peak of the first blue light emitting material
Wavelength is defined as λ1；
λ2With λ1It needs to meet: 350nm≤λ2≤ X nm, X nm < λ1≤500nm；
The range of X is 450nm≤X≤470nm.
In existing blue phosphor materials, the blue phosphor materials for meeting above-mentioned requirements have very much, such as FIrpic,
FCNIr、FCNIrpic、(HF)2Ir(pic)、(HF)2Ir(fptc)、(HFP)2Ir(pic)、(HFP)2Ir(mpic)、(HFP)2Ir
(fptz) etc., when specific choice, it is only necessary to meet the wavelength of transmitting main peak of the first blue light emitting material than the second blue light emitting
At least big 4nm of wavelength of the transmitting main peak of material, those skilled in the art can be according to the transmitting of existing blue phosphor materials
Peak wavelength is selected.
Since feux rouges phosphor material, green light phosphor material have current material with high purity, that luminous efficiency is high, be
The luminous efficiency of white luminous device of the embodiment of the present invention is further increased, red illuminating material and green light luminescent material adopt
Use phosphor material.
Further alternative, adoptable feux rouges phosphor material has Ir (pig)3、Ir(pig-F)2(acac)、Ir(m-
pig)2(acac)、Ir(DBQ)2(acac)、Ir(MDQ)2(acac)、(nam)Ir(bbz)2CF3。
In the embodiment of the present invention, in order to be further reduced the loss of energy transmission, luminous efficiency, the embodiment of the present invention are improved
White luminous device in the second blue light emitting material transmitting main peak and green light luminescent material absorption spectrum in wavelength model
It is trapped among to exist within the scope of 350nm~500nm and overlap.Forster energy transfer passes through the dipole-dipole sense of relatively long distance
Mode is answered to transmit energy, if the emission spectrum of host emitter is Chong Die with the absorption spectrum of guest emitter, and the transition of the two
It is allowed, then will generate quick and non-luminous energy transfer between host and guest's illuminator, so as to reduce the damage of energy transmission
It loses.
Further alternative, adoptable green light phosphor material has Ir (ppy)3、Ir(nbi)2(acac)、Ir(pnbi)2
(acac)、Ir(cbi)2(acac)、Ir(fbi)2(acac)、Ir(tbi)2(acac)、Ir(pybi)2(acac)、Ir(tabi)2
(acac)。
To sum up, the white luminous device of the embodiment of the present invention, by above-mentioned condition to red illuminating material, green luminescence material
The selection of material, navy blue luminescent material and sky blue luminescent material, to be prepared, a kind of excitation purity is high, luminous efficiency is high
And stable white luminous device.
It is further alternative, in the first luminescent layer, the doping concentration of the first blue light emitting material be 3wt.%~
10wt.%；The upper limit of the doping concentration of first blue light emitting material can for 10wt.%, 9wt.%, 8wt.%, 7.5wt.%,
7wt.%, 6wt.%, 5.5wt.%, the lower limit of the doping concentration of the first blue light emitting material can for 3wt.%, 3.5wt.%,
4wt.%, 4.5wt.%, 5wt.%；The doping concentration range of first blue light emitting material can be made of any number.If the
The doping concentration of one blue light emitting material is excessively high, then deep blue light emitting is too strong, influences the illumination effect of feux rouges；If the first blue light
The doping concentration of luminescent material is too low, then deep blue light emitting is insufficient, and then influences the excitation purity of entire white light emitting device, even
White light can not be formed.
Further alternative, in the first luminescent layer, doping concentration 0.5wt.%~5wt.% of red emitting material is red
The upper limit of the doping concentration of light luminescent material can for 5wt.%, 4.5wt.%, 4wt.%, 3.5wt.%, 3wt.%,
2.5wt.%, 2wt.%, the lower limit of the doping concentration of red emitting material can for 0.5wt.%, 1wt.%, 1.5wt.%,
1.75wt.%；The doping concentration range of red emitting material can be made of any number.It is further alternative, red light-emitting material
Doping concentration 0.5wt.%~3wt.% of material.If the doping concentration of red emitting material is excessively high, red light-emitting is too strong, such as
The doping concentration of fruit red emitting material is too low, then red light-emitting is insufficient, and then influences the excitation purity of entire white light emitting device,
White light can not even be formed.
It is further alternative, the first luminescent layer with a thickness of 15nm~20nm.If the thickness of the first luminescent layer is excessive,
It is unfavorable for carrier transport, causes whole efficiency too low；If the thickness of the first luminescent layer is too small, it may appear that efficiency roll-off
(roll off) phenomenon, efficiency will appear sharp fall after substantial increase.
It is further alternative, in the second luminescent layer, the doping concentration of the second blue light emitting material be 3wt.%~
10wt.%；The upper limit of the doping concentration of second blue light emitting material can for 10wt.%, 9wt.%, 8wt.%, 7.5wt.%,
7wt.%, 6wt.%, 5.5wt.%, the lower limit of the doping concentration of the first blue light emitting material can for 3wt.%, 3.5wt.%,
4wt.%, 4.5wt.%, 5wt.%；The doping concentration range of second blue light emitting material can be made of any number.If the
The doping concentration of two blue light emitting materials is excessively high, then day blue light emitting is too strong, influences the illumination effect of green light；If the second blue light
The doping concentration of luminescent material is too low, then the second blue light emitting material can only play the role of energy transfer, itself shine deficiency,
And then the excitation purity of entire white light emitting device is influenced, or even white light can not be formed.
Further alternative, in the second luminescent layer, doping concentration 0.5wt.%~5wt.% of green light luminescent material is green
The upper limit of the doping concentration of light luminescent material can for 5wt.%, 4.5wt.%, 4wt.%, 3.5wt.%, 3wt.%,
2.5wt.%, 2wt.%, the lower limit of the doping concentration of green light luminescent material can for 0.5wt.%, 1wt.%, 1.5wt.%,
1.75wt.%；The doping concentration range of green light luminescent material can be made of any number.It is further alternative, green luminescence material
Doping concentration 0.5wt.%~3wt.% of material.If the doping concentration of green light luminescent material is excessively high, green luminescence is too strong, such as
The doping concentration of fruit green light luminescent material is too low, then green luminescence is insufficient, and then influences the excitation purity of entire white light emitting device,
White light can not even be formed.
It is further alternative, the second luminescent layer with a thickness of 15nm~20nm.If the thickness of the second luminescent layer is excessive,
It is unfavorable for carrier transport, causes whole efficiency too low；If the thickness of the second luminescent layer is too small, it will appear efficiency roll-off
(roll off) phenomenon, efficiency will appear sharp fall after substantial increase.
In the white luminous device of the embodiment of the present invention, by taking first electrode is anode, second electrode is cathode as an example, when white
When color luminescent device includes anode, the first luminescent layer, the second luminescent layer and the cathode successively overlapped, the first luminescent layer is more
Add close to anode, the first luminescent layer can be selected the material of main part that hole mobility is greater than electron mobility, be more conducive to hole
Transmission；The main body that electron mobility is greater than hole mobility can be selected closer to cathode, the second luminescent layer in second luminescent layer
Material is more advantageous to the transmission of electronics；To improve the efficiency and brightness of entire white luminous device.
When white luminous device includes anode, the second luminescent layer, the first luminescent layer and the cathode successively overlapped；
The material of main part that hole mobility is greater than electron mobility can be selected closer to anode, the second luminescent layer in second luminescent layer, more
Added with the transmission for being conducive to hole；Closer to cathode, the first luminescent layer can be selected electron mobility and is greater than hole first luminescent layer
The material of main part of mobility is more advantageous to the transmission of electronics；To improve the efficiency and brightness of entire device.
Meanwhile first the material of main part of luminescent layer and the second luminescent layer same material also can be selected.With main body material of the same race
Expect not only to can simplify device process, but also can be with the stability of lifting assembly as the material for exciting red, blue, green dopant.If
Using different material of main parts, used material of main part need to cooperate its electronics and cavity transmission ability, can just component be made to have
Good charge balance, to obtain optimal component efficiency.
It is further alternative, the first luminescent layer, the second luminescent layer material of main part can be selected from: DPVBi, DPVBA, MADN
Deng.
The organic layer of the white luminous device of the embodiment of the present invention further includes one of the following terms or any in addition to the light emitting layer
Combination: hole transmission layer, electron transfer layer, hole injection layer, electron injecting layer, electronic barrier layer and hole blocking layer；
When including hole transmission layer, hole transmission layer is between anode and luminescent layer；
When including electron transfer layer, electron transfer layer is between cathode and luminescent layer；
When including hole injection layer, hole injection layer is between anode and hole transmission layer；
When including electron injecting layer, electron injecting layer is between cathode and electron transfer layer；
When including electronic barrier layer, electronic barrier layer is between hole transmission layer and luminescent layer；
When including hole blocking layer, hole blocking layer is between electron transfer layer and luminescent layer.
Illustratively, as shown in figure 3, white luminous device 1 is six layer structure, include the first electrode successively overlapped
10, hole transmission layer 13, the first luminescent layer 11, the second luminescent layer 12, electron transfer layer 14 and second electrode 20, first shines
The position of layer 11 and the second luminescent layer 12 can be interchanged.
Illustratively, as shown in figure 4, white luminous device 1 is eight layers of structure, include the first electrode successively overlapped
10, hole injection layer 15, hole transmission layer 13, the first luminescent layer 11, the second luminescent layer 12, electron transfer layer 14, electron injection
The position of layer 16 and second electrode 20, the first luminescent layer 11 and the second luminescent layer 12 can be interchanged.
Illustratively, as shown in figure 5, white luminous device 1 is ten layers of structure, include the first electrode successively overlapped
10, hole injection layer 15, hole transmission layer 13, electronic barrier layer 18, the first luminescent layer 11, the second luminescent layer 12, hole barrier
Layer 17, electron transfer layer 14, electron injecting layer 16 and second electrode 20, the position of the first luminescent layer 11 and the second luminescent layer 12
It can be interchanged.
The second aspect of the embodiment of the present invention proposes a kind of display device, specifically as shown in fig. 6, including the embodiment of the present invention
The white luminous device 1 of first aspect.Display device is specifically as follows such as touch screen, mobile phone, tablet computer, notebook electricity
Brain, any electronic equipment having a display function of electric paper book or television set etc..
In addition to this, white luminous device of the embodiment of the present invention is also used in lighting apparatus.
The production method that the third aspect of the embodiment of the present invention proposes a kind of white luminous device, as shown in fig. 7, being this reality
Apply the production method flow diagram 100 of a white luminous device；The following steps are included:
Step S1: first electrode layer is formed on the substrate；
Step S2: the first luminescent layer is formed in first electrode layer；
Step S3: forming the second luminescent layer on the first luminescent layer,
Step S4: the second electrode lay is formed on the second luminescent layer.
Since the position of the first luminescent layer and the second luminescent layer can be interchanged, white luminous device of the embodiment of the present invention it is another
A kind of production method, as shown in figure 8, being the production method flow diagram 200 of the present embodiment white luminous device；Including following
Step:
Step S1: first electrode layer is formed on the substrate；
Step S2: the second luminescent layer is formed in first electrode layer；
Step S3: the first luminescent layer is formed on the second luminescent layer；
Step S4: the second electrode lay is formed on the first luminescent layer.
Wherein, it in the first luminescent layer doped with the first blue light emitting material and red emitting material, is mixed in the second luminescent layer
Miscellaneous have the second blue light emitting material and a green light luminescent material, the transmitting main peak of the second blue light emitting material and green light luminescent material
Absorption spectrum partly overlaps in maximum absorption band of the wave-length coverage within the scope of 350nm~500nm, the first blue light emitting material
The wavelength for emitting main peak is 4nm at least bigger than the wavelength of the transmitting main peak of big blue light emitting material.
Wherein, the first luminescent layer, the specific restriction of the second luminescent layer and the first blue light emitting material, the second blue light hair
Luminescent material, red emitting material, the specific restriction of green light luminescent material are as previously described.
It is further described below by content of the concrete mode to the embodiment of the present invention.In following specific embodiments
In, following phosphorescent light-emitting materials illustratively can be selected, the Composition of contents of the embodiment of the present invention is not limited, art technology
The content that personnel are introduced according to embodiments of the present invention, the phosphorescent light-emitting materials preparation that other types can be selected have the present invention real
Apply the white light emitting device of an effect.
First blue light emitting material: FIrpic；
Second blue light emitting material: Pt2SPy4；
Red emitting material: Ir (piq)3；
Green light luminescent material: Ir (ppy)3。
Wherein, the transmitting main peak of the second blue light emitting material and the absorption spectrum of green light luminescent material are as shown in Figure 9.Scheming
In 9, the transmitting main peak 100 of the second blue light emitting material and the absorption spectrum 200 of green light luminescent material are in 350nm~500nm model
Maximum absorption band in enclosing partly overlaps.The preparation of OLED device: preparation TFT substrate；Anode is formed on the tft substrate；In sun
Organic layer is formed on extremely；Form cathode.
Device architecture is respectively as follows:
Luminescent device 1#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 2wt.%, 93wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%, 2wt.%,
93wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
In luminescent device 1#, ITO represents anode, the thickness of size Expressing this layer in bracket, for example, ITO (100nm)
Indicate anode with a thickness of 100nm；
F4-TCNQ:NPB is hole injection layer, with a thickness of 10nm；
TAPC is hole transmission layer, with a thickness of 100nm；
FIrpic:Ir(piq)3: DPVBi is the first luminescent layer, with a thickness of 15nm；FIrpic is the first blue light emitting material
Material, doping 5wt.%；Ir(piq)3For red emitting material, doping is material based on 2wt.%:DPVBi, content
For 93wt.%；
Pt2SPy4:Ir(ppy)3: DPVBi is the second luminescent layer, with a thickness of 15nm；Pt2SPy4For the second blue light emitting material
Material, doping 5wt.%；Ir(ppy)3For green light luminescent material, doping is material based on 2wt.%:DPVBi, content
For 93wt.%；
Bphen is electron transfer layer, with a thickness of 20nm；
LiF represents electron injecting layer, with a thickness of 35nm；
Al represents cathode, with a thickness of 100nm.
Luminescent device 2#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/Pt2SPy4:Ir
(ppy)3: DPVBi (5wt.%, 2wt.%, 93wt.%, 15nm)/FIrpic:Ir (piq)3: DPVBi (5wt.%, 2wt.%,
93wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 3#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (10wt.%, 5wt.%, 85wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (10wt.%,
5wt.%, 85wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 4#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 3wt.%, 92wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%, 2wt.%,
92wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 5#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (11wt.%, 2wt.%, 87wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%,
2wt.%, 93wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 6#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 2wt.%, 93wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (11wt.%,
2wt.%, 87wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 7#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (2wt.%, 2wt.%, 96wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%, 2wt.%,
93wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 8#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 2wt.%, 93wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (2wt.%, 2wt.%,
96wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 9#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 6wt.%, 89wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%, 2wt.%,
93wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 10#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 0.4wt.%, 94.6wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%,
2wt.%, 93wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 11#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 2wt.%, 93wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%, 6wt.%,
89wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Luminescent device 12#:ITO (100nm)/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/FIrpic:Ir
(piq)3: DPVBi (5wt.%, 2wt.%, 93wt.%, 15nm)/Pt2SPy4:Ir(ppy)3: DPVBi (5wt.%,
0.4wt.%, 94.6wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Comparative example:
ITO/F4-TCNQ:NPB (1wt.%, 10nm)/TAPC (100nm)/Ir (piq)3: DPVBi (2wt.%,
98wt.%, 15nm)/Pt2SPy4:DPVBi (5wt.%, 95wt.%, 15nm)/Ir (ppy)3: DPVBi (2wt.%,
98wt.%, 15nm)/Bphen (20nm)/LiF (35nm)/Ag (100nm).
Sample after the completion of preparation is tested for the property, and is tested with Keithley 2365A digital nanovoltmeter according to test case
And electric current of the organic photoelectric device manufactured in comparative example under different voltages, then had with electric current divided by light-emitting area
The current density under different voltages of machine electrooptical device.It is tested with Konicaminolta CS-2000 spectroradio luminance meter
Brightness and radiant emittance of the organic photoelectric device made according to test case and comparative example under different voltages.According to having
Current density and brightness of the machine electrooptical device under different voltages, obtain (the 0.1M/cm under same current density2) electric current effect
Rate (Cd/A) and external quantum efficiency EQE.
Using the experimental data of comparative example 1 as 100%, the experimental data of luminescent device 1#~12# is calculated separately.It is surveyed
Examination data are as shown in table 1 (bright voltage is opened in wherein V expression).
Table 1:
According to the experimental data of luminescent device 1#~4# it is found that using two kinds of blue emitting phosphor materials respectively with red light-emitting material
The luminous efficiency that material, green light luminescent material adulterate obtained white luminous device is obviously improved, and the service life also obtains
It is obviously improved.
According to the experimental data of luminescent device 5#~8# it is found that if the first blue light emitting material or the second blue light emitting material
The doping of material is too large or too small, and luminous efficiency and service life have certain downward trend, and white balance is also by certain
It influences.
According to the experimental data of luminescent device 9#~12# it is found that if the doping of red emitting material, green light luminescent material
Measure too large or too small, luminous efficiency and service life have certain downward trend, and white balance is affected.
It is not for limiting claim, any this field skill although the application is disclosed as above with preferred embodiment
Art personnel without departing from the concept of this application, can make several possible variations and modification, therefore the application
Protection scope should be subject to the range that the claim of this application is defined.
Claims (13)
1. a kind of white luminous device, which is characterized in that
The white luminous device include first electrode, relative to the first electrode second electrode and be set to described
The first luminescent layer and the second luminescent layer between one electrode and the second electrode, first luminescent layer are interior doped with the first indigo plant
Light luminescent material and red emitting material, second luminescent layer are interior doped with the second blue light emitting material and green luminescence material
Material；
First blue light emitting material and second blue light emitting material are blue emitting phosphor material, the second blue light hair
The absorption spectrum for emitting main peak and the green light luminescent material of luminescent material is in wave-length coverage in 350nm~500nm range memory
Overlapping, first blue light emitting material transmitting main peak wavelength than second blue light emitting material transmitting
At least big 4nm of the wavelength of main peak.
2. white luminous device according to claim 1, which is characterized in that the red emitting material is phosphor material,
The green light luminescent material is phosphor material.
3. white luminous device according to claim 1, which is characterized in that
The wavelength of the transmitting main peak of second blue light emitting material is λ2, the transmitting main peak of first blue light emitting material
Wavelength is λ1；
λ2With λ1Meet: 350nm≤λ2≤ X nm, X nm < λ1≤500nm；
X meets 450nm≤X≤470nm.
4. described in any item white luminous devices according to claim 1~3, which is characterized in that in first luminescent layer,
The doping concentration of first blue light emitting material is 3wt.%~10wt.%.
5. white luminous device according to claim 1, which is characterized in that in first luminescent layer, the feux rouges
Doping concentration 0.5wt.%~5wt.% of luminescent material.
6. white luminous device according to claim 5, which is characterized in that in first luminescent layer, the feux rouges
Doping concentration 0.5wt.%~3wt.% of luminescent material.
7. described in any item white luminous devices according to claim 1~3, which is characterized in that in second luminescent layer,
The second blue light emitting material doping concentration is 3wt.%~10wt.%.
8. white luminous device according to claim 1, which is characterized in that in second luminescent layer, the green light
Material of main part doping concentration 0.5wt.%~5wt.%.
9. white luminous device according to claim 8, which is characterized in that in second luminescent layer, the green light
Material of main part doping concentration 0.5wt.%~3wt.%.
10. white luminous device according to claim 1, which is characterized in that
The first electrode is anode, and the second electrode is cathode,
When the white luminous device include successively overlap the anode, first luminescent layer, it is described second shine
When layer and the cathode；The hole mobility of the material of main part of first luminescent layer be greater than electron mobility, described second
The electron mobility of the material of main part of luminescent layer is greater than hole mobility；
When the white luminous device include successively overlap the anode, second luminescent layer, it is described first shine
When layer and the cathode；The hole mobility of the material of main part of second luminescent layer be greater than electron mobility, described first
The electron mobility of the material of main part of luminescent layer is greater than hole mobility.
11. white luminous device according to claim 1, which is characterized in that first luminescent layer with a thickness of 15nm
~20nm, second luminescent layer with a thickness of 15nm~20nm.
12. a kind of display device, which is characterized in that including white luminous device as claimed in any one of claims 1 to 11.
13. a kind of production method of white luminous device, which is characterized in that at least include the following steps:
First electrode layer is formed on the substrate；
The first luminescent layer is formed in the first electrode layer, then forms the second luminescent layer on first luminescent layer, most
The second electrode lay is formed on second luminescent layer afterwards；Or
The second luminescent layer is formed in the first electrode layer, then forms the first luminescent layer on second luminescent layer, most
The second electrode lay is formed on first luminescent layer afterwards；
Doped with the first blue light emitting material and red emitting material, the interior doping of second luminescent layer in first luminescent layer
There are the second blue light emitting material and green light luminescent material, first blue light emitting material and second blue light emitting material are equal
For blue emitting phosphor material, the transmitting main peak of second blue light emitting material and the absorption spectrum of the green light luminescent material are in wave
Maximum absorption band of the long range within the scope of 400nm~480nm partly overlaps, the transmitting main peak of first blue light emitting material
Wavelength than second blue light emitting material transmitting main peak wavelength it is 4nm at least big.
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| CN102064282A (en) * | 2009-11-13 | 2011-05-18 | 昆山维信诺显示技术有限公司 | Organic electroluminescent device |
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