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Bipolar blue-light main material and preparation method thereof and organic electroluminescent device

A blue-light host material, bipolar technology, applied in the field of copolymers, can solve the problem of lack of charge transport performance, achieve high triplet energy level, good electron injection and hole blocking and exciton blocking capabilities, excellent thermal stability performance effect

Active Publication Date: 2015-07-08
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few efficient blue phosphorescent devices, mainly due to the lack of both good charge transport performance and high triplet energy level (E T ) of the main material

Method used

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  • Bipolar blue-light main material and preparation method thereof and organic electroluminescent device
  • Bipolar blue-light main material and preparation method thereof and organic electroluminescent device
  • Bipolar blue-light main material and preparation method thereof and organic electroluminescent device

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Experimental program
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preparation example Construction

[0020] The preparation scheme of the above-mentioned bipolar blue light host material is as follows:

[0021] Step S1, providing the structural formula as The 2,7-dibromofluorenone and the structural formula are Triphenylamine derivatives; in the formula, R is H or C 1 ~C 12 The alkyl group, preferably R is C 1 ~C 12 straight-chain or branched-chain alkyl;

[0022] Step S2: In an oxygen-free environment (composed of inert gas, such as nitrogen, argon, etc.), 2,7-dibromofluorenone, triphenylamine derivatives and methanesulfonic acid ( CH 3 SO 3 H, used in acidic environment) is placed in the reactor, stirred and reacted at 140°C for 6h and then cooled to room temperature to obtain the structural formula: 9,9-bis(triphenylamino)-2,7-dibromofluorene derivative; the reaction formula is as follows:

[0023]

[0024] Step S3: Dissolve the 9,9-bis(triphenylamino)-2,7-dibromofluorene derivative prepared in step S2 in an organic solvent, and then add n-butyllithium (n -...

Embodiment 1

[0037] This embodiment discloses 2,7-bis(diphenylphosphinooxy)-9,9-bis(triphenylamino)fluorene (R is H) with the following structural formula:

[0038]

[0039] The preparation of the above-mentioned target molecule is as follows:

[0040] 1. 9,9-bis(triphenylamino)-2,7-dibromofluorene

[0041]

[0042] Under the protection of argon, 2,7-dibromofluorenone (3.38g, 10mmol), triphenylamine (34.3g, 140mmol) and methanesulfonic acid (0.96g, 10mmol) were respectively added into a 100mL three-necked flask. Stir the reaction at 140°C for 6h, stop the reaction and cool to room temperature, extract with dichloromethane, and wash with saturated sodium bicarbonate solution and distilled water respectively. The organic layer was concentrated to give a blue solid. The crude product was separated and purified by silica gel chromatography using petroleum ether / dichloromethane (3:1) as the eluent, and then recrystallized with acetone to obtain white 9,9-bis(triphenylamino)-2,7- Dibromof...

Embodiment 2

[0048] This embodiment discloses 2,7-bis(diphenylphosphinooxy)-9,9-bis[4-(di-p-propylphenyl)aminophenyl]fluorene (R is propyl) with the following structural formula:

[0049]

[0050] The preparation of the above-mentioned target molecule is as follows:

[0051] 1. 9,9-bis[4-(di-p-propylphenyl)aminophenyl]-2,7-dibromofluorene

[0052]

[0053] Under argon protection, in a 100mL three-necked flask, were added 2,7-dibromofluorenone (3.303g, 9mmol), 4-(di-p-propylphenyl)aniline (41.45g, 126mmol), methyl Sulfonic acid (0.9 g, 9 mmol). Stir the reaction at 140°C for 6h, stop the reaction and cool to room temperature, extract with dichloromethane, and wash with saturated sodium bicarbonate solution and distilled water respectively. The organic layer was concentrated to give a blue solid. The crude product was separated and purified by silica gel chromatography using petroleum ether / dichloromethane (3:1) as eluent, and then recrystallized with acetone to obtain a white solid...

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Abstract

The invention belongs to the field of photoelectron materials, and discloses a bipolar blue-light main material, a preparation method and an application thereof; the material has the following general formula, wherein R is H or a C1-C12 alkyl. The bipolar blue-light main material of the invention has good electron injection, hole-blocking and exciton-blocking capabilities, a high triplet-state energy level (ET), and excellent thermal stability.

Description

technical field [0001] The present invention relates to a copolymer, more specifically to a bipolar blue light host material used in semiconductor materials and a preparation method thereof. [0002] The invention also relates to an organic electroluminescent device using a bipolar blue light host material as a light emitting layer. Background technique [0003] Organic electroluminescent devices have the advantages of low driving voltage, fast response speed, wide viewing angle range, rich colors through fine-tuning of chemical structure, easy realization of high resolution, light weight, and large-area flat-panel display. 21st Century Flat Panel Display Technology" has become a research hotspot in the fields of materials, information, physics and flat panel display. Future efficient commercial OLEDs will likely contain organometallic phosphors because they can trap both singlet and triplet excitons, leading to 100% internal quantum efficiency. However, due to the relativ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C07F9/53H01L51/50H01L51/54
Inventor 周明杰王平张振华梁禄生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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