Thermal activation delayed fluorescence material and application thereof
A technology of thermally activated delay and fluorescent materials, which is applied in the field of organic electroluminescent materials, can solve the problems of low thermal stability, low photoluminescent efficiency, and poor film-forming properties, so as to improve thermal stability, inhibit accumulation, reduce The effect of energy level difference
Active Publication Date: 2020-07-10
SHENZHEN UNIV
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Problems solved by technology
[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a thermally activated delayed fluorescent material and its application, aiming to solve the problems of low thermal stability, poor film-forming property and low photoluminescence efficiency of existing TADF materials
Method used
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Embodiment 1
[0055] Preparation of Compound 1:
[0056] The compound 1 is prepared by route a, the cyano-based substrate used is 4-dianilinobenzonitrile, the product is light yellow powder, the yield is 90%, MS (MALDI-TOF): m / z932.8 [M + ].
Embodiment 2
[0058] Preparation of compound 2:
[0059] The compound 2 is prepared by route a, the cyano-based substrate used is 4-carbazol-9-yl-benzonitrile, the product is light yellow powder, the yield is 87%, MS (MALDI-TOF): m / z926.1 [M + ].
Embodiment 3
[0061] Preparation of compound 3:
[0062] The compound 3 was prepared by route a, the cyano substrate used was 4-(3,6-dimethoxy-9hydro-carbazol-9-yl)benzonitrile, the product was yellow powder, and the yield was 73%. MS(MALDI-TOF):m / z1106.7[M + ].
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The invention provides a thermal activation delayed fluorescence material and an application thereof. The thermal activation delayed fluorescence material has the following structure: a compound taking tris([1, 2, 4] triazole)[4, 3-a: 4', 3'-c: 4'', 3''-e][1, 3, 5] triazine as a receptor core has the property of thermally activated delayed fluorescence, and the receptor has a rigid planar structure, so that the thermal stability of the material is effectively improved; a large torsion angle between a donor unit and an acceptor unit can inhibit intermolecular accumulation; the solubility and the film-forming property are improved; meanwhile, the larger torsion angle can reduce overlapping of molecular front line orbits, so that the lowest excited singlet state-triplet state energy level difference is reduced, triplet state excitons can return to the singlet state through reverse intersystem crossing and finally return to the ground state in a radiation transition mode to emit fluorescence, the exciton utilization rate is increased, and finally the purpose of improving the device efficiency is achieved.
Description
technical field [0001] The invention relates to the field of organic electroluminescent materials, in particular to a thermally activated delayed fluorescent material and its application. Background technique [0002] Organic light-emitting diodes (OLED), with its advantages of active light emission, fast response, large viewing angle, low driving voltage, energy saving, thinner and thinner, flexible display, etc., can meet consumers' demands for display technology. The new requirements have broad application prospects in the field of lighting displays, and the market demand is huge. [0003] In recent years, the emergence of Thermally Activated Delayed Fluorescence (TADF) materials has promoted the further development of OLED technology. TADF materials use pure organic building blocks to reduce the energy level difference between the lowest excited singlet state and triplet state through the separation of frontier orbitals, so that the triplet state can be effectively conv...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C07D487/22C07D519/00C07F5/02C07F7/10C09K11/06H01L51/50H01L51/54
CPCC07D487/22C07D519/00C07F5/02C07F7/0816C09K11/06C09K2211/104C09K2211/1074C09K2211/1044C09K2211/1029C09K2211/1033C09K2211/1037H10K85/636H10K85/631H10K85/654H10K85/657H10K85/40H10K85/6572H10K50/11
Inventor 刘贺苏拉吉·库玛·帕塔克杨楚罗
Owner SHENZHEN UNIV
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