CN110635056B - OLED device, display panel, display device and lighting device - Google Patents
OLED device, display panel, display device and lighting device Download PDFInfo
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- CN110635056B CN110635056B CN201910909886.4A CN201910909886A CN110635056B CN 110635056 B CN110635056 B CN 110635056B CN 201910909886 A CN201910909886 A CN 201910909886A CN 110635056 B CN110635056 B CN 110635056B
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H—ELECTRICITY
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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Abstract
The invention discloses an OLED device, comprising: a reflective electrode and a transmissive electrode disposed opposite to each other; and a fluorescent light emitting unit and at least one phosphorescent light emitting unit stacked between the reflective electrode and the transmissive electrode; the fluorescent light-emitting unit comprises a blue light-emitting layer and a green light-emitting layer, and the green light-emitting layer is close to the reflecting electrode compared with the blue light-emitting layer. The invention can improve the efficiency of the OLED device on the premise of ensuring the color rendering index of the OLED device.
Description
Technical Field
The invention relates to the technical field of display. And more particularly, to an OLED device, a display panel, a display apparatus, and a lighting apparatus.
Background
Organic light-emitting display devices (OLEDs) have recently gained more and more attention and applications in the display field, especially in the aspect of small and medium-sized panels, due to a series of natural advantages of active light emission, simple preparation process, fast response speed, wide viewing angle, capability of realizing flexible display and the like, and as more and more flagship phones and even middle and low-end phones begin to adopt screens made of AMOLED materials, huge market potential of OLEDs can be seen, and the OLEDs have broad application prospects.
The basic structure of the organic light emitting display device includes a transmissive electrode layer, a functional layer, and a reflective electrode layer, wherein the functional layer includes: when appropriate voltage is provided for the reflecting electrode and the transmitting electrode, electrons and holes are respectively injected into the electron and hole transport layers from the reflecting electrode and the transmitting electrode and respectively migrate to the light-emitting layer through the electron and hole transport layers, and the holes and the electrons are combined in the light-emitting layer to emit light, so that the self-light-emitting characteristic of the organic light-emitting display device is realized.
Fig. 1 shows a schematic structural diagram of a conventional device in the prior art, as can be seen from fig. 1, in the prior art, a blue light emitting layer 301 is used as an independent light emitting unit, a yellow light emitting layer 401 and a red light emitting layer 402 are used as another independent light emitting unit, the two independent light emitting units are connected through a charge generation layer 500, the blue light emitting layer 301 is located on the side of a transmission electrode 200, and the yellow light emitting layer 401 and the red light emitting layer 402 are located on the side of a reflection electrode 100.
Disclosure of Invention
To solve the technical problems mentioned in the background, a first aspect of the present invention provides an OLED device, including:
a reflective electrode and a transmissive electrode disposed opposite to each other; and
a fluorescent light-emitting unit and at least one phosphorescent light-emitting unit which are stacked between the reflective electrode and the transmissive electrode;
the fluorescent light-emitting unit comprises a blue light-emitting layer and a green light-emitting layer, and the green light-emitting layer is close to the reflecting electrode compared with the blue light-emitting layer.
Optionally, the fluorescent light emitting unit is close to the reflective electrode than the at least one phosphorescent light emitting unit.
Optionally, the fluorescent light-emitting unit comprises
A host material;
a blue light emitting material doped layer formed in the host material;
a green light emitting material doped layer formed in the host material.
Optionally, the fluorescent light-emitting unit comprises
A blue light emitting material layer;
a green light emitting material layer formed on the blue light emitting material layer.
Optionally, the spectral peak wavelengths of the blue light and the green light emitted by the fluorescent light-emitting unit are both less than 530 nm.
Optionally, the phosphorescent light-emitting unit includes a yellow light-emitting layer and a red light-emitting layer, and the spectral peak wavelengths of the yellow light and the red light emitted by the phosphorescent light-emitting unit are both greater than 550 nm.
Optionally, the peak wavelength of the spectrum of the blue light emitted by the blue light emitting layer is 460nm at 450-.
Optionally, the ratio of the spectral intensities of the red light emitted by the red light emitting layer, the yellow light emitted by the yellow light emitting layer, the green light emitted by the green light emitting layer, and the blue light emitted by the blue light emitting layer is: 1: (0.55-0.6): (0.37-0.42): (0.17-0.22).
Optionally, the distance between the reflective electrode and the blue light emitting layer is 50nm-55 nm.
Optionally, the number of the at least one phosphorescent light-emitting unit is 1, wherein a charge generation layer is arranged between the fluorescent light-emitting unit and the 1 phosphorescent light-emitting unit; or
The at least one phosphorescent light-emitting unit is a plurality of phosphorescent light-emitting units which are arranged in a stacked mode, wherein charge generation layers are arranged between the fluorescent light-emitting unit and the phosphorescent light-emitting unit adjacent to the fluorescent light-emitting unit and between the phosphorescent light-emitting units.
Optionally, a first electron transport layer is further disposed between the fluorescent light emitting unit and the reflective electrode, and a first hole transport layer is further disposed between the phosphorescent light emitting unit and the transmissive electrode.
Optionally, a second hole transport layer is further disposed between the fluorescent light emitting unit and the charge generation layer, and a second electron transport layer is further disposed between the phosphorescent light emitting unit and the charge generation layer.
A second aspect of the present invention provides a display panel including the OLED device of the first aspect of the present invention.
A third aspect of the present invention provides a display device including the display panel of the second aspect of the present invention.
A fourth aspect of the invention provides a lighting device comprising the display panel of the first aspect of the invention.
The invention has the following beneficial effects:
the technical scheme of the invention has the advantages of clear principle and simple design, the fluorescent light-emitting unit can emit blue light and green light simultaneously when emitting light, the green light-emitting layer is added in the limited laminated layer, so that the blue light-emitting layer and the green light-emitting layer form a composite light-emitting layer, the color rendering index of the finally compounded light is higher, and the efficiency of the OLED device is improved on the premise of ensuring the color rendering index of the OLED device.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a schematic structural diagram of a conventional device in the prior art;
FIG. 2 is a schematic diagram of a layer structure of an OLED device according to an embodiment of the present invention
FIG. 3 is a schematic diagram showing a layer structure of an OLED device including two phosphorescent light-emitting units in this embodiment;
fig. 4 is a schematic view showing a layer structure of an OELD device in the present embodiment;
fig. 5 shows a schematic diagram of a comparison of spectra of a conventional device in the prior art and a QLED device proposed in this embodiment.
In the figure: 100. a reflective electrode; 200. a transmissive electrode; 300. a fluorescent light-emitting unit; 301. a blue light emitting layer; 302. a green light emitting layer; 400. a phosphorescent light-emitting unit; 401. a yellow light emitting layer; 402. a red light emitting layer; 500. a charge generation layer; 600. a first electron transport layer; 700. a first hole transport layer; 800. a second hole transport layer; 900. a second electron transport layer.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Fig. 2 is a schematic diagram illustrating a layer structure of an OLED device according to an embodiment of the present invention, as shown in fig. 2, including: the organic el display includes a reflective electrode 100 and a transmissive electrode 200 which are disposed to face each other, and a fluorescent light emitting cell 300 and at least one phosphorescent light emitting cell 400 which are disposed between the reflective electrode 100 and the transmissive electrode 200 in a stacked manner.
Specifically, the fluorescent light emitting cells 300 should be understood as light emitting cells containing fluorescent materials, and correspondingly, the phosphorescent light emitting cells 400 should be understood as light emitting cells containing phosphorescent materials, in the example of fig. 2, the number of the phosphorescent light emitting cells 400 is 1, and since the light emitting efficiency of the light emitting cells containing phosphorescent materials is greater than that of the light emitting cells containing fluorescent materials, in order to improve the overall light emitting efficiency of the OLED device, the number of the phosphorescent light emitting cells 400 may be set to be plural in the same OLED device (in the example of fig. 3, the number of the phosphorescent light emitting cells 400 is 2), it should be noted that, when the number of the phosphorescent light emitting cells 400 is plural, the current efficiency of the OLED device is correspondingly improved, and the power efficiency may be correspondingly reduced, and the number and the positions of the phosphorescent light emitting cells 400 are not particularly limited in this embodiment, preferably, in order to further improve the efficiency of the OLED device, the fluorescent light emitting unit 300 is close to the reflective electrode 100 compared to the at least one phosphorescent light emitting unit 400.
In the example of fig. 4, since in the prior art, the spectral intensity of the blue light emitted by the blue light emitting layer 301 is strong, and the efficiency of the OLED device is difficult to improve on the premise of ensuring the color rendering index of the OLED device, in order to solve the above problem, in this embodiment, the fluorescent light emitting unit 300 includes the blue light emitting layer 301 and the green light emitting layer 302, where the blue light emitting layer 301 includes a blue light emitting material, the green light emitting layer 302 includes a green light emitting material, and the green light emitting layer 302 is closer to the reflective electrode 100 than the blue light emitting layer 301, and when the fluorescent light emitting unit 300 emits light, the fluorescent light emitting unit 300 can emit blue light and green light at the same time, and the green light emitting layer 302 is added in a limited stack layer, so that the blue light emitting layer 301 and the green light emitting layer 302 form a composite light emitting layer, and further the color rendering index of the finally combined light is higher, and on the premise of ensuring the color rendering index of the OLED device, the efficiency of the OLED device is improved.
In some optional implementations of this embodiment, the fluorescence light-emitting unit 300 includes
A host material;
a blue light emitting material doped layer formed in the host material;
a green light emitting material doped layer formed in the host material.
Specifically, the blue light emitting layer 301 and the green light emitting layer 302 are formed by doping corresponding blue light emitting materials and green light emitting materials on one host material, and corresponding manufacturing on the two host materials is not required, so that the difficulty of the manufacturing process of the OLED device is further reduced, and the overall structure thickness is reduced, wherein the host material can be an n-type organic material, and exemplarily includes: HAT-CN, C60, and C70. It should be understood by those skilled in the art that the present invention is not limited to the type of n-type organic material used as the host material, and other n-type organic materials should also fall within the scope of the present invention.
In some optional implementations of this embodiment, the fluorescence light-emitting unit 300 includes
A blue light emitting material layer;
a green light emitting material layer formed on the blue light emitting material layer.
Specifically, the blue light emitting material layer and the green light emitting material layer are formed by material growth.
In the example of fig. 4, the phosphorescent light emitting unit 400 includes a red light emitting layer 402 and a yellow light emitting layer 401, and it should be noted that in the present embodiment, the red light emitting layer 402 and the yellow light emitting layer 401 are stacked.
In some optional implementations of this embodiment, in order to further improve the efficiency of the OLED device, the spectral peak wavelengths of the blue light and the green light emitted by the fluorescent light emitting unit 300 are both less than 530nm, and the spectral peak wavelengths of the yellow light and the red light emitted by the phosphorescent light emitting unit 400 are both greater than 550 nm.
Specifically, in one example, the peak wavelength of the spectrum of the blue light emitted by the blue light emitting layer 301 is 460nm, the full width at half maximum is greater than 50nm, the peak wavelength of the spectrum of the green light emitted by the green light emitting layer 302 is 518-525nm, the full width at half maximum is greater than 48nm, the peak wavelength of the spectrum of the yellow light emitted by the yellow light emitting layer 401 is 555-565nm, the full width at half maximum is greater than 80nm, the peak wavelength of the spectrum of the red light emitted by the red light emitting layer 402 is 615-625nm, and the full width at half maximum is greater than 60 nm.
In some optional implementations of the present embodiment, the longer the peak wavelength of the spectrum of the light emitted by each of the fluorescent light-emitting unit 300 and the phosphorescent light-emitting unit 400 is, the stronger the corresponding spectral intensity is.
Illustratively, the ratio of the spectral intensities of the red light emitted by the red light emitting layer 402, the yellow light emitted by the yellow light emitting layer 401, the green light emitted by the green light emitting layer 302, and the blue light emitted by the blue light emitting layer 301 is: 1: (0.55-0.6): (0.37-0.42): (0.17-0.22).
It should be noted that the spectral intensities of the emitted red, yellow, green and blue light are further changed by changing the thicknesses and doping concentrations of the red, yellow, green and blue light emitting layers 402, 302 and 301, and preferably, the spectral intensity ratios of the red, yellow, green and blue light are controlled by changing the layer thicknesses and the concentrations of the light emitting materials as follows: 1: 0.57: 0.4: 0.5, in the present embodiment, the peak wavelength and the spectral intensity of the spectrum of each light emitting layer are combined according to the above ratio, so as to match the spectral shape required by high color rendering index, and correspondingly improve the efficiency of the OLED device.
Fig. 5 is a schematic diagram showing a comparison of spectra of a conventional device in the prior art shown in fig. 1 and a QLED device proposed in the present embodiment, in fig. 5, the conventional spectra are shown as spectra of the conventional device in the prior art, and the comparison of performances shown in the following table can be obtained by combining fig. 5 and corresponding performance tests:
from the above table, one can obtain: after the spectral peak wavelengths, the full widths at half maximum and the spectral intensities of the red light, the yellow light, the green light and the blue light are correspondingly adjusted, the current efficiency and the efficiency of the OLED device in the embodiment are higher than those of the conventional device, and the color rendering index is correspondingly improved.
In some optional implementations of this embodiment, a distance between the reflective electrode 100 and the blue light emitting layer 301 is 50nm to 55 nm.
Specifically, in this embodiment, the distance between the blue light emitting layer 301 and the reflective electrode 100 is set to be 50nm to 55nm, so that the efficiency of the OLED device can be further improved on the premise of improving the color rendering index.
In some optional implementations of this embodiment, there are 1 of the at least one phosphorescent light-emitting unit 400, wherein a charge generation layer 500 is disposed between the fluorescent light-emitting unit 300 and the 1 phosphorescent light-emitting unit 400; or
The at least one phosphorescent light emitting unit 400 is a plurality of phosphorescent light emitting units 400 stacked, wherein a charge generation layer 500 is disposed between the fluorescent light emitting unit 300 and the phosphorescent light emitting unit 400 adjacent thereto and between the plurality of phosphorescent light emitting units 400.
Specifically, when the number of the phosphorescent light emitting cells 400 is 1, the phosphorescent light emitting cells 400 and the fluorescent light emitting cells 300 are connected through one charge generation layer 500, and when the number of the phosphorescent light emitting cells 400 is greater than 1, for example, 2, the first phosphorescent light emitting cell 400 and the fluorescent light emitting cell 300 are connected through one charge generation layer 500, and the corresponding first phosphorescent light emitting cell 400 and the second phosphorescent light emitting cell 400 are connected through one charge generation layer 500, it should be noted that, in the example of fig. 4, the OLED device is shown to include one phosphorescent light emitting cell 400.
In some optional implementations of this embodiment, a first electron transport layer 600 is further disposed between the fluorescent light emitting unit 300 and the reflective electrode 100, and a first hole transport layer 700 is further disposed between the phosphorescent light emitting unit 400 and the transmissive electrode 200.
Specifically, the first electron transport layer 600 is mainly used to transport electrons generated from the reflective electrode 100 to the fluorescent light emitting unit 300, and correspondingly, the first hole transport layer 700 is used to transport holes generated from the transmissive electrode 200 to the phosphorescent light emitting unit 400.
In some optional implementations of this embodiment, a second hole transport layer 800 is further disposed between the fluorescent light emitting unit 300 and the charge generation layer 500, and a second electron transport layer 900 is further disposed between the phosphorescent light emitting unit 400 and the charge generation layer 500.
Specifically, the second hole transport layer 800 is used for transporting holes generated by the charge generation layer 500 to the fluorescent light emitting unit 300, and correspondingly, the second electron transport layer 900 is used for transporting electrons generated by the charge generation layer 500 to the phosphorescent light emitting unit 400.
In some optional embodiments of this embodiment, the reflective electrode 100 may be a cathode, and the transmissive electrode 200 may be an anode.
Another embodiment of the present invention provides a display panel including the OLED device provided in the above embodiment.
Specifically, in this embodiment, a corresponding color filter substrate may be further disposed on the light exit side of the OLED device.
Another embodiment of the present invention provides a display device including the display panel provided in the above embodiment.
A further embodiment of the present invention proposes a lighting apparatus comprising the OLED device provided in the above embodiment.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (11)
1. An OLED device, comprising:
a reflective electrode and a transmissive electrode disposed opposite to each other; and
a fluorescent light-emitting unit and at least one phosphorescent light-emitting unit which are stacked between the reflective electrode and the transmissive electrode;
wherein the fluorescent light-emitting unit comprises a blue light-emitting layer and a green light-emitting layer, and the green light-emitting layer is closer to the reflective electrode than the blue light-emitting layer;
wherein, the first and the second end of the pipe are connected with each other,
the phosphorescent light-emitting unit comprises a yellow light-emitting layer and a red light-emitting layer;
the fluorescent light emitting unit is closer to the reflective electrode than the at least one phosphorescent light emitting unit,
the peak wavelengths of the spectrums of the blue light and the green light emitted by the fluorescent light-emitting unit are both smaller than 530nm, and the peak wavelengths of the spectrums of the yellow light and the red light emitted by the phosphorescent light-emitting unit are both larger than 550 nm;
the peak wavelength of the spectrum of the blue light emitted by the blue light emitting layer is 450-460nm, the full width at half maximum is greater than 50nm, the peak wavelength of the spectrum of the green light emitted by the green light emitting layer is 518-525nm, the full width at half maximum is greater than 48nm, the peak wavelength of the spectrum of the yellow light emitted by the yellow light emitting layer is 555-565nm, the peak wavelength of the spectrum of the red light emitted by the red light emitting layer is 615-625nm, and the full width at half maximum is greater than 60 nm.
2. The OLED device of claim 1, wherein the fluorescent light-emitting unit comprises
A host material;
a blue light emitting material doped layer formed in the host material;
a green light emitting material doped layer formed in the host material.
3. The OLED device of claim 1, wherein the fluorescent light-emitting unit comprises
A blue light emitting material layer;
a green light emitting material layer formed on the blue light emitting material layer.
4. The OLED device of claim 1 wherein the ratio of the spectral intensities of the red light emitted by the red light-emitting layer, the yellow light emitted by the yellow light-emitting layer, the green light emitted by the green light-emitting layer, and the blue light emitted by the blue light-emitting layer is: 1: (0.55-0.6):
(0.37-0.42)：(0.17-0.22)。
5. the OLED device of claim 1, wherein the distance between the reflective electrode and the blue light emitting layer is 50nm-55 nm.
6. The OLED device of claim 1, wherein the at least one phosphorescent light-emitting unit is 1, and wherein a charge generation layer is disposed between the fluorescent light-emitting unit and the one phosphorescent light-emitting unit; or
The at least one phosphorescent light-emitting unit is a plurality of phosphorescent light-emitting units which are arranged in a stacked mode, wherein charge generation layers are arranged between the fluorescent light-emitting unit and the phosphorescent light-emitting unit adjacent to the fluorescent light-emitting unit and between every two phosphorescent light-emitting units.
7. The OLED device of claim 1, wherein a first electron transport layer is further disposed between the fluorescent light emitting unit and the reflective electrode, and a first hole transport layer is further disposed between the phosphorescent light emitting unit and the transmissive electrode.
8. The OLED device of claim 1, wherein a second hole transport layer is further disposed between the fluorescent light emitting unit and the charge generating layer, and a second electron transport layer is further disposed between the phosphorescent light emitting unit and the charge generating layer.
9. A display panel comprising an OLED device as claimed in any one of claims 1 to 8.
10. A display device characterized by comprising the display panel according to claim 9.
11. An illumination device comprising an OLED device as claimed in any one of claims 1 to 8.
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