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Thermally activated fluorescent material with electron acceptor segment composed of carbon and hydrogen atoms and its application

A technology of host materials and oxygen atoms, applied in the field of fluorescent materials, can solve the problems of reduced lifespan and low device stability.

Active Publication Date: 2021-08-10
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When thermally activated delayed fluorescent materials designed with these electron acceptor fragments are prepared into organic electroluminescent devices, the stability of the device is not high and the lifetime will be reduced.

Method used

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  • Thermally activated fluorescent material with electron acceptor segment composed of carbon and hydrogen atoms and its application
  • Thermally activated fluorescent material with electron acceptor segment composed of carbon and hydrogen atoms and its application
  • Thermally activated fluorescent material with electron acceptor segment composed of carbon and hydrogen atoms and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Preparation of 10-(acenaphtho[3,2,1,8-fghij]phenaph-7-yl)-10hydrophenoxazine

[0047]

[0048] Wherein, X is an oxygen atom.

[0049] The compound (2mmol, 0.7g) shown in formula (3) and ultra-dry dichloromethane (30.0mL), the CH of IBr 2 Cl 2 The solution (4ml, 1.0M) was mixed and the resulting mixture was stirred at room temperature for 4h, quenched with sodium bisulfate, extracted with dichloromethane and water. Then the organic phase was washed with anhydrous Na 2 SO 4 Drying, and then the residual solvent in the organic phase was removed under reduced pressure to obtain a solid, which is the compound represented by formula (4).

[0050]The solid obtained under reduced pressure (0.25 g) was added to toluene, followed by phenoxazine (1.1 mmol, 0.2 g), Pd(OAc) 2 (30mg), P(t-Bu) 3 (1mL), Cs 2 CO 3 (960mg), heated to 100°C and stirred under nitrogen for 10 hours. After cooling to room temperature, it was concentrated and purified by column chromato...

Embodiment 2

[0058] Fabrication and Performance Evaluation of Organic Electroluminescent Devices Using 10-(acenaphtho[3,2,1,8-fghij]perphene-7-yl)-10hydrophenoxazine Prepared in Example 1 as Fluorescent Doping Dye . The organic electroluminescent device is composed of a glass substrate 1, a hole transport layer 2, an electron blocking layer 3, a light emitting layer 4, an electron transport layer 5 and a cathode layer 6 arranged in sequence ( figure 1 ).

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Abstract

The present invention relates to a compound represented by formula (I), whose structural formula is as follows: wherein, X is selected from an oxygen atom, a sulfur atom or a benzimino group. The above compound has thermally activated fluorescence properties, and the electron acceptor segment in the compound is only composed of carbon and hydrogen atoms, and can be used to prepare organic electroluminescent devices with low voltage drive and high external quantum efficiency.

Description

technical field [0001] The invention relates to the field of fluorescent materials, in particular to a heat-activated fluorescent material whose electron acceptor segment is composed of carbon and hydrogen atoms and its application. Background technique [0002] An organic electroluminescent device is a current-mode semiconductor light-emitting device based on organic materials. Its basic structure belongs to a sandwich structure. The classic structure is to make a layer of organic light-emitting material on ITO glass as a light-emitting active layer, and above the light-emitting layer. Add a layer of metal electrodes. Through further optimization, the efficiency of the device can be improved, and the electron transport layer and the hole transport layer can be added. When an external voltage is applied to the device, the holes and electrons generated by the positive and negative electrodes recombine into excitons in the light-emitting material, and the energy of the excito...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D241/46C07D265/38C07D279/22C09K11/06H01L51/50H01L51/54
CPCC07D241/46C07D265/38C07D279/22C09K11/06C09K2211/1037C09K2211/1033C09K2211/1044C09K2211/1011H10K85/624H10K85/657H10K50/12H10K85/6572H10K50/11
Inventor 张晓宏陈嘉雄张祥王凯
Owner SUZHOU UNIV
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