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A bipolar OLED phosphorescent host material and a light-emitting device comprising the material

A technology for light-emitting devices and host materials, applied in the field of light-emitting devices and OLED materials, can solve the problems of rapid decline in device efficiency, acceleration of triplet-triplet annihilation, etc., so as to increase the glass transition temperature and thermal decomposition temperature, and reduce phosphorescence quenching. The effect of extinguishing and improving external quantum efficiency

Active Publication Date: 2018-06-19
VALIANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Narrow exciton recombination regions lead to accelerated triplet-triplet annihilation, leading to a rapid drop in device efficiency especially at high voltages

Method used

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  • A bipolar OLED phosphorescent host material and a light-emitting device comprising the material
  • A bipolar OLED phosphorescent host material and a light-emitting device comprising the material
  • A bipolar OLED phosphorescent host material and a light-emitting device comprising the material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 The preparation of compound C02

[0034]

[0035] 1) Under nitrogen protection, the raw material 3,6-dibromoxanthone (1.77g, 5mmol), phenoxazine (2.02g, 11mmol) and 150mL toluene were added to a 250mL three-necked flask, and then the catalyst palladium acetate ( 0.022g, 0.1mmol) and catalyst ligand tri-tert-butylphosphine tetrafluoroborate (0.058g, 0.2mmol), acid-binding agent potassium carbonate (2.07g, 15mmol). The system was heated to reflux and stirred for 10 hours, then cooled naturally to 20-25°C, then 50 mL of water was added to quench the reaction, the liquid was separated, the solvent was removed, and the crude product was crystallized with toluene to obtain 2.23 g of intermediate C02-a with a yield of 79.9%.

[0036] High resolution mass spectrometry, ESI source, positive ion mode, molecular formula C 37 h 22 N 2 o 4 , the theoretical value is 558.1580, and the test value is 558.1576. Elemental analysis (C 37 h 22 N 2 o 4 ), theoretica...

Embodiment 2

[0041] The preparation of embodiment 2 compound C03

[0042]

[0043] The synthesis method refers to the preparation method of C02, and the total yield is 26.5%.

[0044] High resolution mass spectrometry, ESI source, positive ion mode, molecular formula C 67 h 51 N 2 o 2 P, theoretical value 946.3688, test value 946.3683. Elemental analysis (C 67 h 51 N 2 o 2 P), theoretical value C: 84.97, H: 5.43, N: 2.96, O: 3.38, P: 3.27, measured value C: 84.96, H: 5.44, N: 2.96, O: 3.36, P: 3.29.

Embodiment 3

[0045] The preparation of embodiment 3 compound C04

[0046]

[0047] The synthesis method refers to the preparation method of C02, and the total yield is 23.6%.

[0048] High resolution mass spectrometry, ESI source, positive ion mode, molecular formula C 61 h 39 N 2 o 2 P, theoretical value 862.2749, test value 862.2751. Elemental analysis (C 61 h 39 N 2 o 2 P), theoretical value C: 84.90, H: 4.56, N: 3.25, O: 3.71, P: 3.59, measured value C: 84.91, H: 4.57, N: 3.25, O: 3.71, P: 3.59.

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Abstract

The present invention relates to an OLED material, which is characterized in that spiro[fluorene-9,9'-oxanthene] and phenylphosphine oxide structure are the core, and the general structural formula is: wherein Ar1 and Ar2 are independently selected from hydrogen and polycyclic aromatic groups containing heteroatoms, and Ar1 and Ar2 are not hydrogen at the same time. The invention also provides a method for preparing the OLED material. The present invention also provides a light-emitting device comprising the OLED material as a host material of a light-emitting layer. The compound structure disclosed in the present invention has good bipolar transport characteristics for transporting holes and electrons, has high carrier transport capacity, and can effectively increase the glass transition temperature and thermal decomposition temperature of molecules, which is beneficial to further improving the device. The life of the device has great benefits, and the prepared device can effectively improve the external quantum efficiency, power efficiency and current efficiency.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, and more particularly relates to an OLED material and a light-emitting device containing the material. Background technique [0002] Electromechanical luminescence has the advantages of ultra-thin, self-illumination, wide viewing angle, fast response, high luminous efficiency, low driving voltage, and low energy consumption. According to the luminescence process in which excitons radiatively transition from the excited singlet state or excited triplet state back to the ground state, electroluminescence is divided into two types: electroluminescence and electrophosphorescence. Constrained by spin statistics, the ratio of singlet and triplet excitons is 1:3 during the formation of excitons. Fluorescent materials can only use the radiative transition from singlet excitons to the ground state due to the triplet exciton spin prohibition, resulting in the internal quantum efficiency of elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/6558C07F9/655C07F9/6561C09K11/06H01L51/50H01L51/54
CPCC09K11/06C07F9/65522C07F9/65586C07F9/6561C09K2211/1044C09K2211/1033C09K2211/1029C09K2211/1088H10K85/636H10K85/633H10K85/631H10K85/6574H10K85/657H10K85/6572H10K50/00
Inventor 张成新石宇李庆巨成良刘英瑞王元勋
Owner VALIANT CO LTD
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