Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Blue light-emitting organic electroluminescent material, its preparation method and organic electroluminescent device

A luminescent and electromechanical technology, applied in luminescent materials, electrical solid devices, organic chemistry, etc., can solve problems such as poor blue light color purity, luminous color purity of blue light luminescent materials, luminous efficiency device efficiency attenuation bottlenecks, etc., to reduce self- Quenching phenomenon, beneficial to evaporation, reducing the effect of direct action

Inactive Publication Date: 2014-08-06
OCEANS KING LIGHTING SCI&TECH CO LTD +2
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although various optimizations have been made to the FIrpic OLED structure, and the device performance has been greatly improved, the biggest weakness of FIrpic is that the blue light emitted by FIrpic is sky blue, and the color purity of the blue light is not good. The CIE of each OLED device produced It varies between (0.13~0.17,0.29~0.39), which is a big gap with the standard Blu-ray CIE (0.137,0.084)
[0007] People's research on iridium metal complexes of organic electroluminescent materials has been in-depth, but blue light-emitting materials have always had bottlenecks in terms of luminous color purity, luminous efficiency, and device efficiency attenuation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Blue light-emitting organic electroluminescent material, its preparation method and organic electroluminescent device
  • Blue light-emitting organic electroluminescent material, its preparation method and organic electroluminescent device
  • Blue light-emitting organic electroluminescent material, its preparation method and organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The preparation method of the above-mentioned blue-light organic electroluminescent material comprises the following steps:

[0048] S1. In an oxygen-free environment (in the present invention, the oxygen-free environment is at least one of nitrogen and argon, preferably nitrogen, the same below), the structural formula is The compound A (due to the different substitution position and substituent group of R, its chemical name is different, please refer to the examples for details, the same below) and the structural formula is The compound B (due to the different substitution positions of the two Fs, its chemical name is different, see the examples for details, the same below) is dissolved in an organic solvent, and tetrabutyl bromide, which acts as a phase transfer catalyst, is added to the organic solvent Ammonium, alkali and rake catalyst, Suzuki reflux coupling reaction for 5h, stop the reaction, obtain the structural formula after separation and purification treat...

Embodiment 1

[0055] Example 1: Complex tris(3-(4',6'-difluorophenyl)pyridazine-N,C 2 ’) Synthesis of iridium

[0056] (1) Synthesis of 3-(2',4'-difluorophenyl)pyridazine

[0057]

[0058] Under nitrogen protection, 2.29g (20mmol) 3-chloropyridazine, 3.79g (24mmol) 2,4-difluorophenylboronic acid, 80mL DMF, 20mL water, 3.22g (10mmol) tetrabutylammonium bromide (TBTA) , 5.53g (40mmol) anhydrous potassium carbonate, 0.23g (0.2mmol) tetrakis (triphenylphosphine) palladium (Pd (PPh 3 ) 4 ), stirred and refluxed for 5h. After the reaction solution was cooled to room temperature, it was extracted with dichloromethane, separated, washed with water until neutral, and dried over anhydrous magnesium sulfate. After filtration, the filtrate was distilled off the solvent under reduced pressure to obtain the crude product. Silica gel column chromatography was carried out with dichloromethane as the eluent. After drying, 2.69 g of solid was obtained, with a yield of 70.0%.

[0059] Structure Ident...

Embodiment 2

[0076] Example 2: Complex tris(3-(4',5'-difluorophenyl)pyridazine-N,C 2 ’) Synthesis of iridium

[0077] (1) Synthesis of 3-(3',4'-difluorophenyl)pyridazine

[0078] The synthesis steps are basically the same as the synthesis of the ligand 3-(2',4'-difluorophenyl)pyridazine in Example 1. The difference is that 3,4-difluorophenylboronic acid was used instead of 2,4-difluorophenylboronic acid to obtain a white solid product with a yield of 66%.

[0079] Structure Identification:

[0080] Mass Spectrum (MS m / z): 192.0 (M + )

[0081] Elemental Analysis: C 10 h 6 f 2 N 2

[0082] Theoretical value: C, 62.50; H, 3.15; F, 19.77; N, 14.58;

[0083] Found: C, 62.45; H, 3.17; F, 19.76; N, 14.62.

[0084] The above data confirm that the substance obtained by the above reaction is 3-(4',5'-difluorophenyl)pyridazine.

[0085] (2) Complex tris(3-(4',5'-difluorophenyl)pyridazine-N,C 2 ’) Synthesis of iridium

[0086] Synthetic steps and complex three (3-(4 ', 6'-difluorophenyl) ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of organic electroluminescent materials and discloses a blue light-emitting organic electroluminescent material and its preparation method and use. The blue light-emitting organic electroluminescent material has a general structural formula shown in the description, and in the formula, R represents hydrogen atom, alkyl or alkoxy. The blue light-emitting organic electroluminescent material comprises 3-phenylpyridazine as a ring metal ligand main structure and also comprises hydrogen atom, alkyl or alkoxy so that satisfactory energy transmission efficiency and blue light emission wavelength are obtained and a certain steric-hinerance effect is produced and thus direct effect between metal atoms is reduced and triplet exciton self-quenching phenomenon is reduced. Two F and cyano substituent groups on the phenyl ring effectively realize blue shift of emission wavelength and improve luminescence performances.

Description

technical field [0001] The invention relates to an organic electroluminescent material, in particular to a blue light organic electroluminescent material and a preparation method thereof. The invention also relates to an organic electroluminescence device using the blue light organic electroluminescence material as a light-emitting layer material. Background technique [0002] Organic electroluminescence refers to a luminescence phenomenon in which organic materials directly convert electrical energy into light energy under the action of an electric field. In the early days, the research on organic electroluminescence was stagnant because of the high driving voltage and low luminous efficiency of organic electroluminescent devices. Until 1987, people such as Tang of American Kodak Company invented 8-hydroxyquinoline aluminum (Alq 3 ) is a light-emitting material, and a uniform and dense high-quality thin film is made with aromatic diamines, and an organic electroluminescen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C07F15/00H01L51/54
Inventor 周明杰王平张娟娟梁禄生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com