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

A phosphorescent main body and bipolar technology, which is applied in the bipolar blue phosphorescent main material and its preparation, and in the field of organic electroluminescent devices, can solve problems such as shortage, reduce manufacturing cost, reduce process flow, and improve luminous efficiency Effect

Inactive Publication Date: 2014-12-03
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

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

Method used

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  • Bipolar blue light phosphorescent host material, preparation method and organic electroluminescent device thereof
  • Bipolar blue light phosphorescent host material, preparation method and organic electroluminescent device thereof
  • Bipolar blue light phosphorescent host material, preparation method and organic electroluminescent device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The bipolar blue phosphorescence host material of this embodiment has a structure of 9,9'-(5-(phenylsulfonyl)-1,3-phenylene)bis(9H-carbazole), and the preparation steps are as follows:

[0043]

[0044] Step 1: Under nitrogen protection, dissolve 9,9'-(5-bromo-1,3-phenylene)bis(9H-carbazole) (38.9g, 80mmol) in 200mLN,N-dimethylformaldehyde Amide (DMF) solution, then add thiophenol (8.8g, 80mmol), potassium carbonate (22.1g, 160mmol), cuprous iodide (1.52g, 8mmol). The mixture was stirred and reacted at 120°C for 3 hours. Stop the reaction and cool to room temperature, filter, wash the solid three times with distilled water, and use the eluent n-hexane to separate the crude product through a silica gel column to obtain an off-white solid compound, namely The yield was 88%.

[0045] Step 2: Dissolve compound C (20.6g, 40mmol) in 120mL of dichloromethane (DCM) solution in 0°C ice-water mixing bath, then drop it into 90mL m-chlorobenzoic acid (mCPBA) (2mol / L) in dic...

Embodiment 2

[0049] The bipolar blue phosphorescence host material of this embodiment has a structure of 9,9'-(5-(phenylsulfonyl)-1,3-phenylene)bis(9H-carbazole), and the preparation steps are as follows:

[0050]

[0051] Step 1: Dissolve 9,9'-(5-bromo-1,3-phenylene)bis(9H-carbazole) (38.9g, 80mmol) in 200mL toluene (Tol) solution under nitrogen protection, Then thiophenol (9.68g, 88mmol), cesium carbonate (57.2g, 176mmol), copper powder (0.768g, 12mmol) were added. The mixture was stirred and reacted at 110°C for 6 hours. Stop the reaction and cool to room temperature, filter, wash the solid three times with distilled water, and use the eluent n-hexane to separate the crude product through a silica gel column to obtain an off-white solid compound, namely The yield was 94%.

[0052] The second step: the step is the same as the second step in the first embodiment.

Embodiment 3

[0054] The bipolar blue phosphorescence host material of this embodiment has a structure of 9,9'-(5-(phenylsulfonyl)-1,3-phenylene)bis(9H-carbazole), and the preparation steps are as follows:

[0055]

[0056] The first step: under nitrogen protection, 9,9'-(5-bromo-1,3-phenylene)bis(9H-carbazole) (38.9g, 80mmol) was dissolved in 200mL acetonitrile (MeCN) solution, Then thiophenol (10.6g, 96mmol), potassium phosphate (39g, 184mmol) and cuprous oxide (2.3g, 16mmol) were added. The mixture was stirred and reacted at 90°C for 8 hours. Stop the reaction and cool to room temperature, filter, wash the solid three times with distilled water, and use the eluent n-hexane to separate the crude product through a silica gel column to obtain an off-white solid compound, namely The yield was 84%.

[0057] The second step: the step is the same as the second step in the first embodiment.

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Abstract

Belonging to the field of organic semiconductor materials, the invention discloses a bipolar blue light phosphorescent host material, a preparation method and an organic electroluminescent device thereof. The host material has a structural formula shown as the specification. The bipolar blue light phosphorescent host material provided by the invention has bipolar carrier transport capacity, also has hole transport properties and electron transport properties at the same time, and enables balance transport of holes and electrons in a luminescent layer. With a high triplet state energy level, the host material can effectively prevent back transmission of energy to the host material in a luminescence process, thus greatly improving the luminescence efficiency.

Description

technical field [0001] The invention relates to the field of organic semiconductor materials, in particular to a bipolar blue phosphorescence host material and a preparation method thereof. The invention also relates to an organic electroluminescent device, the material of the light-emitting layer contains bipolar blue phosphorescence host material. Background technique [0002] 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, thereby achieving 100% internal quantum efficiency. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D209/86C09K11/06H01L51/54
CPCC09K11/06C07D209/86H10K85/6572
Inventor 周明杰张振华王平黄辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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