Blue-light fluorescent organic light-emitting diode with hybrid localized charge transfer material containing tta process as the main body and preparation method thereof
A technology of light-emitting diodes and fluorescence, which is applied in the direction of chemical instruments and methods, luminescent materials, electric solid devices, etc., can solve the problems of HLCT material efficiency not reaching the expected result, low efficiency, etc., to improve efficiency roll-off and stability, improve Device Efficiency, Efficiency Improvement Effect
Active Publication Date: 2022-01-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
However, compared with phosphorescence and TADF materials, the efficiency of HLCT materials has not reached the expected results, and effective methods need to be explored to further improve their efficiency and give full play to the characteristics of high efficiency, high stability and low efficiency roll-off of HLCT materials
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[0036] A blue fluorescent OLEDs based on the HLCT material containing TTA process, the schematic diagram of its structure is shown in figure 1 Shown, its preparation method comprises the following steps:
[0037] First, ultrasonically treat the ITO glass substrate with an alkaline cleaning agent, then rinse the ITO glass surface with deionized water, dry it with high-purity nitrogen, bake it in an oven at 120°C for 30 minutes, and then treat it with ultraviolet ozone for 6 minutes Finally, put it into the vacuum coating machine, wait until the pressure of the vacuum coating machine is reduced to 1×10 -4 Pa, thin films are sequentially evaporated on the surface of the ITO conductive glass substrate. First, the hole injection layer is evaporated, and then the hole transport layer, the electron blocking layer, the light emitting layer, the electron transport layer, the electron injection layer and the cathode are evaporated in sequence to obtain the blue fluorescent light based ...
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Abstract
The invention discloses a blue-light fluorescent organic light-emitting diode with a hybrid local charge transfer material containing TTA process as the main body and a preparation method thereof. The light-emitting layer of the blue-light fluorescent organic light-emitting diode is composed of HLCT host material and blue fluorescent guest material Doped composition, the host material is PAC, and the blue light fluorescent guest material is BD. The blue fluorescent OLEDs based on the HLCT material containing the TTA process of the present invention can well realize the Dexter energy transfer between the host and the guest, so that the excitons captured on the BD can be transferred to the HLCT containing the TTA process through the Dexter energy transfer. The lowest triplet excited state of the HLCT host can be effectively utilized by TTA, and blue fluorescent OLEDs with high efficiency, low efficiency roll-off and good stability are finally prepared, which provides a new way to prepare high-performance blue fluorescent OLEDs.
Description
technical field [0001] The invention belongs to the technical field of organic light-emitting diodes, and specifically relates to a hybrid localized charge transfer (HLCT) material with a high-energy state reverse intersystem crossing (hRISC) process and a triplet-triplet annihilation (TTA) process as the main body. Blue light fluorescent organic light emitting diode and its preparation method. Background technique [0002] Organic light-emitting diodes (OLEDs) are a new generation of display and lighting technology. Due to the advantages of self-illumination, rich material sources, wide color gamut, soft light, no blue light damage, and flexibility and bendability, it has attracted attention in the fields of full-color flat panel display and lighting. It has received extensive attention and developed rapidly. However, compared with red and green OLEDs, blue OLEDs still have problems in terms of efficiency and lifetime, hindering the development of the OLEDs industry. Acco...
Claims
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IPC IPC(8): H01L51/50H01L51/54H01L51/56C09K11/06
CPCC09K11/06C09K2211/1011C09K2211/1014H10K71/164H10K85/60H10K50/121H10K71/00
Inventor 马东阁林城伟肖曙代岩峰孙倩胡德华马於光
Owner SOUTH CHINA UNIV OF TECH