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Copolymer blue light host material, preparation method thereof and organic electroluminescent device

A technology of blue light host material and copolymer, applied 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, high electroluminescence efficiency, high efficiency improved effect

Inactive Publication Date: 2015-01-21
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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  • Copolymer blue light host material, preparation method thereof and organic electroluminescent device
  • Copolymer blue light host material, preparation method thereof and organic electroluminescent device
  • Copolymer blue light host material, preparation method thereof and organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The copolymer blue light host material of this embodiment, that is, poly{2,7-diyl-9,9-bis(4-n-hexyloxybenzene)fluorene-co-(4,4'-(2,7-di Base-9H-fluorene-9,9-diyl)bis(4,1-phenylene))bis(diphenylphosphine oxide)} (represented by P1) (where R is n-hexyl, n=57), 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, 9,9-bis(4-n-hexaneoxybenzene)fluorene-2,7-dipinacol borate (154mg, 0.2mmol), (4,4'-(2, 7-Dibromo-9H-fluorene-9,9-diyl)bis(4,1-phenylene))bis(diphenylphosphine oxide) (175mg, 0.2mmol) was added to a flask containing 10ml of toluene solvent, fully After dissolving, potassium carbonate (2mL, 2mol / L) solution was added to the flask, vacuumed to deoxygenate and filled with argon, then bistriphenylphosphine palladium dichloride (5.6mg, 0.008mmol) was added; the flask was heated The Suzuki coupling reaction wa...

Embodiment 2

[0040] The copolymer blue light host material of this embodiment, that is, poly{2,7-diyl-9,9-bis(4-methoxybenzene)fluorene-co-(4,4'-(2,7-diyl -9H-fluorene-9,9-diyl)bis(4,1-phenylene))bis(diphenylphosphineoxy)} (represented by P2) (where R is methyl, n=82), its structural formula as follows:

[0041]

[0042] The preparation steps of above-mentioned polymer are as follows:

[0043] The reaction formula is as follows:

[0044]

[0045] Under the protection of a mixed gas of nitrogen and argon, 9,9-bis(4-methoxybenzene)fluorene-2,7-dipinacol borate (189mg, 0.3mmol), (4,4'- Add (2,7-dibromo-9H-fluorene-9,9-diyl)bis(4,1-phenylene))bis(diphenylphosphine oxide) (263mg, 0.3mmol) and 15mL tetrahydrofuran into two ports of 50mL In the bottle, after fully dissolving, introduce a mixture of nitrogen and argon to exhaust the air for about 20 minutes, then add tetrakistriphenylphosphine palladium (4mg, 0.003mmol) into it, and then add sodium bicarbonate (3mL, 2mol / L) solution. T...

Embodiment 3

[0048] The copolymer blue light host material of this embodiment, that is, poly{2,7-diyl-9,9-bis(4-n-eicosyloxybenzene)fluorene-co-(4,4'-(2,7 -diyl-9H-fluorene-9,9-diyl) two (4,1-phenylene)) two (diphenylphosphine oxygen)} (represented by P3) (wherein, R is n-eicosyl group, n =40), its structural formula is as follows:

[0049]

[0050] The preparation steps of above-mentioned polymer are as follows:

[0051] The reaction formula is as follows:

[0052]

[0053] Under nitrogen protection, 9,9-bis(4-n-eicosyloxybenzene)fluorene-2,7-dipinacol borate (349mg, 0.3mmol), (4,4'-(2, 7-Dibromo-9H-fluorene-9,9-diyl)bis(4,1-phenylene))bis(diphenylphosphine oxide) (289mg, 0.33mmol), palladium acetate (3.5mg, 0.015mmol) and Tris(o-methoxyphenyl)phosphine (21mg, 0.06mmol) was added into a flask filled with 12mL of N,N-dimethylformamide, and after fully dissolving, potassium carbonate (3mL, 2mol / L) solution was added, Then nitrogen was passed into the flask to exhaust the air for a...

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Abstract

Belonging to the field of organic semiconductors, the invention discloses a copolymer blue light host material, a preparation method thereof and an organic electroluminescent device. The host material has a structural general formula shown as the specification, wherein R is alkyl of C1-C20, and n is an integer of 15-96. In the copolymer blue light host material provided by the invention, the phosphine-oxygen group has a tetrahedral configuration, and is a good electron transmission unit. Polyfluorene derivatives are an important category of electroluminescent polymers, and the 9- position can be modified so as to improve the solubility performance and film-forming performance of polyfluorene derivatives. By introducing the phosphine-oxygen group to a polyfluorene derivative main chain, efficiency of the organic electroluminescent device can be improved.

Description

technical field [0001] The invention relates to the field of organic semiconductor materials, in particular to a copolymer blue light host material and a preparation method thereof. The invention also relates to an organic electroluminescence device using the copolymer blue light 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 singlet excitons only accounts for 25% of...

Claims

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Application Information

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IPC IPC(8): C08G61/02C09K11/06H01L51/54
Inventor 周明杰张振华王平张娟娟
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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