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Boron-containing organic electroluminescent material and application thereof in organic electroluminescent device

A technology for electroluminescent materials and electroluminescent devices, which is applied in the fields of luminescent materials, electro-solid devices, organic chemistry, etc., can solve the problem of low S1 state radiation transition rate, difficult and high exciton utilization rate, and high fluorescence radiation efficiency and efficiency. roll-off and other issues

Inactive Publication Date: 2020-06-05
JIANGSU SUNERA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although theoretically TADF materials can achieve 100% exciton utilization, there are actually the following problems: (1) The T1 and S1 states of the designed molecules have strong CT characteristics, and the very small S1-T1 state energy gap, although it can A high T1→S1 state exciton conversion rate is achieved through the TADF process, but at the same time it leads to a low S1 state radiative transition rate. Therefore, it is difficult to achieve both (or simultaneously) high exciton utilization efficiency and high fluorescence radiation efficiency; (2) even Doped devices have been used to alleviate the T-exciton concentration quenching effect, and most devices made of TADF materials have a serious efficiency roll-off at high current densities

Method used

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  • Boron-containing organic electroluminescent material and application thereof in organic electroluminescent device
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  • Boron-containing organic electroluminescent material and application thereof in organic electroluminescent device

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Experimental program
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Effect test

Embodiment 1

[0089] Embodiment 1: Embodiment (1-1)-embodiment (1-23) shows the preparation method for preparing intermediate (1-1) to (1-23), intermediate (1-1) to ( 1-23) are structured as follows:

[0090]

[0091]

Embodiment (1-1

[0092] Embodiment (1-1): the preparation of intermediate A-3:

[0093]

[0094] In a 250mL three-neck flask, under nitrogen protection, add 0.01mol3,4-bromobenzene diboronate, 0.015mol3-phenoxyiodobenzene, dissolve with a mixed solvent of toluene and ethanol (90mL of toluene, 45mL of ethanol), and then Add containing 0.03mol Na 2 CO 3 Na 2 CO 3 Aqueous solution (2M), stirred with nitrogen for 1h, then added 0.0001mol Pd(PPh 3 ) 4 , Heated to reflux for 15h, sampled and plated, the reaction was complete. Natural cooling, filtration, rotary evaporation of the filtrate, and the residue passing through a silica gel column gave intermediate 1-1-1; elemental analysis structure (molecular formula C 18 h 14 BBrO 3): theoretical value C, 58.59; H, 3.82; B, 2.93; Br, 21.65; test value: C, 58.59; H, 3.82; B, 2.93; ESI-MS (m / z) (M+): The theoretical value is 368.02, and the measured value is 368.89.

[0095] In a 250mL three-neck flask, under nitrogen protection, add 0.01mol1...

Embodiment (1-2

[0097] Embodiment (1-2): the preparation of intermediate A-15:

[0098]

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Abstract

The invention discloses a boron-containing organic electroluminescent material and application thereof in an organic electroluminescent device, the compound comprises boron groups, and the compound has strong group rigidity, and has the characteristics of difficult crystallization between molecules, difficult aggregation and good film-forming property. When the compound is used as a luminescent layer material of the organic electroluminescent device, the current efficiency, the power efficiency and the external quantum efficiency of the device are greatly improved; and meanwhile, the service life of the device is obviously prolonged.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a boron-containing organic electroluminescent material and its application in organic electroluminescent devices. Background technique [0002] Organic electroluminescent (OLED: Organic Light Emission Diodes) device technology can be used to manufacture new display products and also can be used to make new lighting products, which is expected to replace the existing liquid crystal display and fluorescent lighting, and has a wide application prospect. [0003] The OLED light-emitting device is like a sandwich structure, including electrode material film layers, and organic functional materials sandwiched between different electrode film layers. Various functional materials are superimposed on each other according to the application to form an OLED light-emitting device. As a current device, when a voltage is applied to the electrodes at both ends of the OLED light-emitting ...

Claims

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Application Information

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IPC IPC(8): C07F5/02C09K11/06H01L51/54
CPCC07F5/027C09K11/06C09K2211/1096C09K2211/1088C09K2211/1029C09K2211/1033C09K2211/1014C09K2211/1007H10K85/636H10K85/654H10K85/657
Inventor 李崇陈海峰叶中华王芳
Owner JIANGSU SUNERA TECH CO LTD
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