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Organic electroluminescent material and device thereof

A technology for electroluminescent devices and electroluminescent materials, which is applied in the directions of luminescent materials, electro-solid devices, electrical components, etc., can solve the problem of low luminous efficiency of devices, low energy transfer efficiency to guest materials, and triplet energy of host materials of light-emitting layers. It can improve the luminous efficiency, excellent electron transport performance, and good hole transport performance.

Inactive Publication Date: 2021-05-28
苏州远卓科技信息有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low triplet energy level of the host material of the light-emitting layer and low energy transfer efficiency to the guest material in the prior art, resulting in low luminous efficiency of the device.

Method used

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  • Organic electroluminescent material and device thereof
  • Organic electroluminescent material and device thereof
  • Organic electroluminescent material and device thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides an organic electroluminescence material having a structure as shown in formula (I):

[0046]

[0047] R 1 , R 3 -R 9 , R 11 , R 12 is independently selected from hydrogen, halogen, cyano, alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, silyl or aryl;

[0048] R 2 , R 10 independently selected from furyl, thienyl, pyrrolyl, imidazolyl, oxazolyl, thiazolyl, benzofuryl, benzimidazolyl, quinolinyl, isoquinolyl.

[0049] The synthetic route of the structure shown in formula (I) is:

[0050]

[0051] 0.5mol of the compound shown in formula (I-A) and 500mL water are transferred in the 2000mL round bottom flask, the concentrated hydrochloric acid of 200mL6N is added, the ice-salt bath keeps the temperature lower than 0 ℃, stirs; Add dropwise the aqueous solution of sodium nitrite ( 0.5 mol of sodium nitrite), stop adding until the starch potassium iodide test paper turns slightly blue; dissolve 1.5 mol of sodium sulfite with 500 mL of water, ...

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Abstract

The invention belongs to the technical field of display, and particularly relates to an organic electroluminescent material. According to the organic electroluminescent material provided by the invention, substituted indolinyl and substituted phenyl are respectively introduced to 1-site and 6-site of benzopyran, so that a bidipolar material is formed, the HOMO energy level is distributed in an electron-donating group, the LUMO energy level is distributed in an electron-withdrawing group, effective separation of the HOMO energy level and the LUMO energy level can be realized, and the organic electroluminescent material has good hole transport performance, also has excellent electron transmission performance so as to realize balanced transmission of charges. According to a device prepared from the material, the anti-intersystem crossing (RISC) rate of conversion from a triplet state to a singlet state is high, energy transfer is promoted, and the singlet state exciton proportion is improved, so that energy loss in the Dexter energy transfer (DET) process is reduced, the efficiency roll-off of the organic electroluminescent device is effectively reduced, and the external quantum efficiency of the device is improved.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to an organic electroluminescent material and a device thereof. Background technique [0002] Organic Light-Emitting Diode (OLED), as a current-mode light-emitting device, has become more and more popular due to its characteristics of self-luminescence, low driving voltage, high luminous efficiency, short response time, and high clarity and contrast. It is widely used in the field of high-performance display. [0003] Most OLEDs use a sandwich structure, that is, the organic light-emitting layer is sandwiched between electrodes on both sides. The luminescence mechanism is: driven by an external electric field, electrons and holes are injected from the cathode and anode into the organic electron transport layer and the hole transport layer respectively, and recombine in the organic light emitting layer to generate excitons, and the excitons radiatively transition back t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D491/107C07F7/08C09K11/06H01L51/50H01L51/54
CPCC07D491/107C07F7/0814C09K11/06C09K2211/1029C09K2211/1033C09K2211/1037C09K2211/1044C09K2211/1088C09K2211/1092C09K2211/185H10K85/656H10K85/654H10K85/655H10K85/657H10K85/6574H10K85/342H10K85/40H10K85/6572H10K50/11
Inventor 王艳慧
Owner 苏州远卓科技信息有限公司