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A kind of organic electroluminescent device and display device
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A technology for electroluminescent devices and organic light-emitting layers, which can be used in electro-solid devices, electrical components, semiconductor devices, etc., and can solve the problems of large roll-off of device efficiency, inability of phosphorescent materials to become dyes, and high cost.
Active Publication Date: 2022-04-01
TSINGHUA UNIV
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Specifically, traditional fluorescent materials have the disadvantage of not being able to utilize triplet excitons. Although phosphorescent materials can achieve 100% energy use efficiency by introducing heavy metal atoms, such as iridium or platinum, to realize the transition from singlet excitons to triplet states, but Heavy metals such as iridium or platinum are very scarce, expensive and easily cause environmental pollution, so phosphorescent materials cannot be the first choice for dyes
Thermally activated delayed fluorescent materials can realize reverse intersystem jumping from triplet excitons to singlet states by absorbing ambient heat, and then emit fluorescence from singlet states. However, the lifetime of triplet excitons in TADF materials is long, and the device efficiency drops Disadvantages such as large drop and poor stability
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preparation example Construction
[0106] The present invention also provides a preparation method of the organic electroluminescent device, to figure 1 As an example, it includes sequentially depositing an anode 2 , a hole transport region 3 , an organic light-emitting layer 4 , an electron transport region 5 , and a cathode 6 on a substrate 1 , and then packaging. Wherein, when preparing the organic light-emitting layer 4, the organic light-emitting layer 4 is formed by co-evaporating a wide bandgap material source, an electron donor material source, an electronacceptor material source and a resonant TADF material source.
[0107] Specifically, the preparation method of the organic electroluminescent device of the present invention comprises the following steps:
[0108] 1. Ultrasonically treat the glass plate coated with the anode material in a commercial cleaning agent, rinse in deionized water, ultrasonically degrease in acetone: ethanol mixed solvent, bake in a clean environment until the water is comple...
Embodiment 1
[0119] The device structure of this embodiment is as follows:
[0121] The glass plate coated with the ITO transparent conductive layer is ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in acetone: ethanol mixed solvent, baked in a clean environment until the water is completely removed, and then cleaned with ultraviolet light. Light and ozone cleaning, and bombardment of the surface with a beam of low-energy cations;
[0122] HATCN was vacuum evaporated on the ITO transparent conductive layer as the hole injection layer of the device, the evaporation rate was 0.1nm / s, and the total film thickness was 5nm;
[0131] The meaning of the device is roughly the same as that of Example 1, the only difference is that the dye concentration of the organic light-emitting layer is different.
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Abstract
The invention relates to an organic electroluminescence device and a display device, belonging to the technical field of organic electroluminescence. This organic electroluminescent device of the present invention comprises an organic light-emitting layer, the organic light-emitting layer comprises a host material and a doped dye, the host material is a wide bandgap material, and the singlet energy level (S 1 h ) is greater than the singlet energy level of the luminescent dye (S 1 g ), and the triplet energy level of the host material (T 1 h ) greater than or equal to the second triplet energy level of the luminescent dye (T 2 g ); the second triplet energy level of the luminescent dye (T 2 g ) is greater than or equal to the first singlet energy level of the luminescent dye (S 1 g ); the luminescent dye is a fluoroborazine methylenebipyridine compound or a fluorobora methylenebipyridine compound. The device of the invention realizes 100% excitonutilization rate by regulating the energy level relationship of the host and the guest, thereby improving the efficiency and stability of the organic light-emitting device.
Description
technical field [0001] The invention relates to an organic electroluminescence device and a display device, belonging to the technical field of organic electroluminescence. Background technique [0002] Organic Light Emitting Diode (OLED) is a device that is driven by current to achieve the purpose of emitting light. Its main characteristics come from the organic light-emitting layer. When an appropriate voltage is applied, electrons and holes Excitons are combined in the organic light-emitting layer to emit light of different wavelengths according to the characteristics of the organic light-emitting layer. At present, the light-emitting layer is composed of host materials and doped dyes, and the dyes are mostly selected from traditional fluorescent materials and phosphorescent materials. Specifically, traditional fluorescent materials have the disadvantage of not being able to utilize triplet excitons. Although phosphorescent materials can achieve 100% energy use efficienc...
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