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Bipolar copolymer blue phosphorescence main material, preparation method thereof and organic electroluminescent device

A bipolar copolymer and phosphorescent host technology, which can be used in luminescent materials, electro-solid devices, semiconductor devices, etc., can solve the problems of poor thermal stability and low luminous efficiency, and achieve excellent film-forming performance and high electroluminescence efficiency. , the effect of reducing manufacturing costs

Inactive Publication Date: 2014-12-31
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the host materials in electroluminescent devices mainly include small molecule host materials and polymer host materials, which have poor thermal stability and low luminous efficiency.

Method used

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  • Bipolar copolymer blue phosphorescence main material, preparation method thereof and organic electroluminescent device
  • Bipolar copolymer blue phosphorescence main material, preparation method thereof and organic electroluminescent device
  • Bipolar copolymer blue phosphorescence main material, preparation method thereof and organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The bipolar copolymer blue-light phosphorescent host material of this embodiment, that is, poly{N-(4-n-hexyloxyphenyl)-2,7-diylcarbazole-co-3,5-di(3-yl -Phenyl)-4-naphthyl-4H-1,2,4-triazole} (P1) (where R is n-hexyl, n=39), its structural formula is as follows:

[0033]

[0034] The preparation steps of above-mentioned polymer are as follows:

[0035] The reaction formula is as follows:

[0036]

[0037] Under argon protection, N-(4-n-hexaneoxyphenyl)-2,7-dipinacol borate carbazole (119mg, 0.2mmol), 3,5-bis(3-bromobenzene Base)-4-naphthyl-4H-1,2,4-triazole (101mg, 0.2mmol) was added to a flask containing 10ml of toluene solvent, and after fully dissolving, potassium carbonate (2mL, 2mol / L) solution was added to In the flask, the oxygen was vacuumed and filled with argon, and then bistriphenylphosphine palladium dichloride (5.6mg, 0.008mmol) was added; the flask was heated to 100°C for Suzuki coupling reaction for 48h. Subsequently, the polymerization reaction w...

Embodiment 2

[0041] The bipolar copolymer blue-light phosphorescent host material of this embodiment, that is, poly{N-(4-methoxyphenyl)-2,7-diylcarbazole-co-3,5-bis(3-yl- Phenyl)-4-naphthyl-4H-1,2,4-triazole} (where R is methyl, n=98), its structural formula is as follows:

[0042]

[0043] The preparation steps of above-mentioned polymer are as follows:

[0044] The reaction formula is as follows:

[0045]

[0046]Under the protection of a mixed gas of nitrogen and argon, N-(4-methoxyphenyl)-2,7-dipinacol borate carbazole (130mg, 0.3mmol), 3,5-bis(3- Bromophenyl)-4-naphthyl-4H-1,2,4-triazole (152mg, 0.3mmol) and 15mL tetrahydrofuran were added to a 50mL two-necked bottle, and after fully dissolving, a mixture of nitrogen and argon was introduced to exhaust After about 20 minutes in the air, tetrakistriphenylphosphine palladium (4mg, 0.003mmol) was added into it, and after fully dissolved, sodium bicarbonate (3mL, 2mol / L) solution was added. Then, the mixed gas of nitrogen and arg...

Embodiment 3

[0049] The bipolar copolymer blue-light phosphorescent host material of this embodiment, that is, poly{N-(4-n-eicosyloxyphenyl)-2,7-diylcarbazole-co-3,5-bis(3 -yl-phenyl)-4-naphthyl-4H-1,2,4-triazole} (where R is n-eicosyl, n=83), its structural formula is as follows:

[0050]

[0051] The preparation steps of above-mentioned polymer are as follows:

[0052] The reaction formula is as follows:

[0053]

[0054] Under nitrogen protection, N-(4-n-eicosyloxyphenyl)-2,7-dipinacol borate carbazole (238mg, 0.3mmol), 3,5-bis(3-bromobenzene base)-4-phenyl-4H-1,2,4-triazole (167mg, 0.33mmol), palladium acetate (3.5mg, 0.015mmol) and tris(o-methoxyphenyl)phosphine (21mg, 0.06mmol ) into a flask containing 12mL of N,N-dimethylformamide, fully dissolved and then adding potassium carbonate (3mL, 2mol / L) solution, and then blowing nitrogen into the flask and exhausting the air for about 30min; the flask was heated The Suzuki coupling reaction was performed at 130°C for 12h. Subseq...

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Abstract

The invention belongs to the field of organic semiconductors, and discloses a bipolar copolymer blue phosphorescence main material, a preparation method thereof and an organic electroluminescent device. The structural general formula of the main material is shown in the specification. In the formula, R is a C1-C20 alkyl group, and n is an integer from 16 to 98. In the bipolar copolymer blue phosphorescence main material, triazole is an electron transfer unit, and is in favor of transferring charges; and carbazole is an important electroluminescent material and has an excellent hole transport performance, N can be modified with an alkyl group to improve the dissolving performance and the film forming performance of copolymerized carbazole, and triazole is introduced to the main chain of a carbazyl polymer to realize the carrier balance of the organic electroluminescent device in order to solve the low efficiency problem of the organic electroluminescent device.

Description

technical field [0001] The invention relates to the field of organic semiconductor materials, in particular to a bipolar copolymer blue phosphorescence host material and a preparation method thereof. The invention also relates to an organic electroluminescent device using the bipolar copolymer blue phosphorescence host material as a host material of a light-emitting layer. Background technique [0002] Since 1987, C.W.Tang et al. of Kodak reported for the first time that Alq 3 Since the double-layer device structure of light-emitting materials, organic electroluminescence has received great attention. Organic electroluminescence can be divided into fluorescence and phosphorescence electroluminescence. According to the spin quantum statistical theory, the formation probability ratio of singlet excitons and triplet excitons is 1:3, that is, singlet excitons only account for 25% of the "electron-hole pairs". Therefore, the fluorescence from the radiative transition of single...

Claims

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Application Information

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IPC IPC(8): C08G61/12C09K11/06H01L51/54
Inventor 周明杰张振华王平冯小明
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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