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Red fluorescent materials for electroluminescent device and its preparing process

An electroluminescence device and red fluorescence technology, which is applied in the field of optoelectronics, can solve the problems of low fluorescence efficiency and poor color purity, and achieve the effects of high fluorescence efficiency, low cost and simple preparation process

Inactive Publication Date: 2004-06-02
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a red electroluminescence material with high fluorescence efficiency and good color purity and its preparation method in order to overcome the shortcomings of low fluorescence efficiency and poor color purity in the prior art

Method used

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  • Red fluorescent materials for electroluminescent device and its preparing process
  • Red fluorescent materials for electroluminescent device and its preparing process
  • Red fluorescent materials for electroluminescent device and its preparing process

Examples

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Embodiment 1

[0019] 3,5,5-trimethyl-2-cyclohexene-1 (110mmol, 15.2g) and malononitrile (100mmol, 6.6g) were dissolved in dimethylformamide (50ml) solution, and then added to the solution Add piperidine (1.5g), glacial acetic acid (0.3g) and acetic anhydride (0.2g), and stir the mixture at 80°C for 60 minutes, mix well, and then distill the mixture under reduced pressure to drive off excess dimethylformaldehyde Amide; treat the obtained product with concentrated hydrochloric acid (about 3ml) and hot water (about 100ml), and filter the obtained precipitate after treatment; add 2-propanol (15ml) and water (2ml) to the precipitate and grind thoroughly , The solid and the liquid were separated and dried to obtain a crude product. To the crude product, a mixed solution of methylene chloride and hexane with a volume ratio of 8:2 was added, and after flash chromatography, about 14 g of a red powdery solid was finally obtained. See figure 1 .

Embodiment 2

[0021] 3,5,5-Trimethyl-2-cyclohexene-1 (220mmol, 30.4g) and malononitrile (200mmol, 13.2g) were dissolved in dimethylformamide (100ml), then piperidine was added (3.0g), glacial acetic acid (0.6g) and acetic anhydride (0.4g), the mixture was stirred at 85°C for 50 minutes, then the mixture was distilled under reduced pressure to remove excess dimethylformamide, and the obtained product was concentrated Treat with hydrochloric acid (about 6ml) and hot water (about 200ml), and filter after treatment; add 2-propanol (30ml) and water (4ml) to the filtered precipitate, grind thoroughly, separate the solid and liquid, and dry; To obtain a crude product, a mixed solution of dichloromethane and hexane with a volume ratio of 8:2 was added to the crude product, and after rapid chromatographic separation, about 28 g of a red powdery solid was finally obtained. The electroluminescent spectra of the double-layer device made of the material of the present invention under different bias volt...

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Abstract

A red fluorescent material is prepared through single-tank synthesis process and features high fluorescent efficiency and better colour purity. Its chemical formula is C21H23N3 and its basic structure is 3-dinitrle methylene-5,5-dimethyl-1-(4-dimethylamine-benzenevinyl)-1-cyclohexene. It can be added to Alq3 matrix to be used as activating layer of electroluminescent diode, generating 630 nm red light.

Description

(1) Technical field [0001] The invention relates to a red fluorescent material for an electroluminescent device and a preparation method thereof, belonging to the field of optoelectronic technology. (2) Background technology [0002] In recent years, organic electroluminescence (EL) has attracted great attention. Organic electroluminescence is based on the injection of electrons or holes flowing between the cathode and the anode into the organic electroluminescence active layer in the electroluminescent device, forming the emission of wanderers, whose emission wavelength depends on the characteristics of the material. People hope to realize full-color display through organic electroluminescent devices, therefore, three primary colors of red, green and blue are required. Currently, green and blue organic electroluminescent materials have achieved high fluorescence efficiency and good color purity. However, red organic electroluminescent materials still face problems such as...

Claims

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Application Information

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IPC IPC(8): C09K11/06
Inventor 陶绪堂王继扬邵宗书于晓强蒋民华
Owner SHANDONG UNIV
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