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Red light emitted compound used for organic electroluminous device and orgainic electroluminous device using same

A technology of electroluminescent devices and compounds, applied in electroluminescent light sources, organic semiconductor devices, organic chemistry, etc., can solve the problems of low red chroma, incomplete chroma, and reduced quenching luminous efficiency

Active Publication Date: 2004-10-06
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the peak wavelength of the luminescence spectrum of the above-mentioned DCM is at 600nm, and the width of the half-bandwidth is about 100nm. Therefore, corresponding to full color, the chromaticity of red is greatly low
In addition, if the concentration of red-emitting dopants such as DCM is small, the spectrum in the orange region will be obtained; if the concentration is large, the red region can be emitted, but the luminous efficiency decreases due to its own quenching
Alternatively, Alq3[tris(8- Quinolinolate) aluminum] as an electron transport material for red-emitting devices is unsatisfactory as a display material in terms of its luminance and chromaticity
[0029] However, an organometallic complex whose central metal is europium is known to be a substance emitting red light and has high chromaticity, but the maximum luminance of an organic EL device using this substance is very low [see Applied Physics Letter, 65(17 ), 2124-2126 (1994)]
[0030] Japanese Patent Laid-Open No. 1999-329731 discloses the manufacture of an organic EL device emitting red light by using a special distyryl compound, but the half bandwidth of the emission spectrum is greater than 100 nm, and therefore, its chromaticity is considered to be incomplete

Method used

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  • Red light emitted compound used for organic electroluminous device and orgainic electroluminous device using same
  • Red light emitted compound used for organic electroluminous device and orgainic electroluminous device using same
  • Red light emitted compound used for organic electroluminous device and orgainic electroluminous device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129]In this example, an organic EL device using Compound 10 as a dopant and Alq3 as a host for a red-emitting emitting layer was fabricated.

[0130] First, CuPC (copper(II) phthalocyanine) was vacuum-deposited to a thickness of 30 nm on ITO-deposited glass washed with microwaves to form a hole injection layer. Then, NPD (N,N′-dinaphthyl-N,N′-diphenyl-(1,1′-biphenylyl)-4,4′-diamine) was vacuum-deposited thereon to a thickness of 50 nm After the hole transport layer was formed, Alq3 (host) was deposited with a thickness of 30 nm on the hole transport layer to form an emission layer, and Alq3 was doped with 1.0% of compound 10 (dopant). Electron transport layer (Alq3; 40nm), electron injection layer (Li 2 O; 25nm) and a cathode (Mg / Ag; 100nm), thereby obtaining an organic EL device.

[0131] A direct voltage of forward bias was applied to the organic EL device prepared in Example 1, and its luminous performance was evaluated. The glowing color is red. The result of the spe...

Embodiment 2

[0133] In this example, an organic EL device using Compound 1 as a host and DCM as a dopant for a red emitting layer was fabricated.

[0134] First, CuPC with a thickness of 30 nm was vacuum-deposited on ITO-deposited glass washed with microwaves to form a hole-injection layer. Then, NPD (N,N'-dinaphthyl-N,N'-phenyl-(1,1'-biphenyl)-4,4'-diamine) was vacuum-deposited on it to a thickness of 50 nm to form A hole transport layer, and then deposit compound 1 (host) with a thickness of 30 nm on the hole transport layer to form an emission layer, and compound 1 is doped with 1.0% DCM (dopant). Electron transport layer (Alq3; 40nm), electron injection layer (Li 2 O; 25nm) and a cathode (Mg / Ag; 100nm), thereby obtaining an organic EL device.

[0135] A forward bias DC voltage was applied to the organic EL device prepared in Example 2, and its luminous performance was evaluated. The glowing color is red. The result of the spectroscopic test is that the luminescence peak of the spec...

Embodiment 3

[0137] In this example, an organic EL device using Compound 22 as a host and DCM as a dopant for a red emitting layer was fabricated.

[0138] First, CuPC with a thickness of 30 nm was vacuum-deposited on ITO-deposited glass washed with microwaves to form a hole-injection layer. Then, NPD (N,N'-dinaphthyl-N,N'-phenyl-(1,1'-biphenyl)-4,4'-diamine) was vacuum-deposited on it to a thickness of 50 nm to form A hole transport layer, and then deposit compound 22 (host) with a thickness of 30 nm on the hole transport layer to form an emission layer, and compound 22 is doped with 1.0% DCM (dopant). Electron transport layer (Alq3; 40nm), electron injection layer (Li 2 O; 25nm) and a cathode (Mg / Ag; 100nm), thereby obtaining an organic EL device.

[0139] A forward bias DC voltage was applied to the organic EL device prepared in Example 3, and its luminous performance was evaluated. The glowing color is red. The result of the spectroscopic test is that the luminescence peak of the s...

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Abstract

The present invention relates to red color emitting compounds for an organic electroluminescent device (OELD), particularly to red color emitting compounds represented by the following formula (1) having high luminescence efficiency and enhanced thermal-stability: R1-CH=CH-X-CH=CH-R2 wherein, R1, R2 and X each are as defined below.

Description

technical field [0001] The present invention relates to a red-emitting compound used in an organic electroluminescent device (OELD), in particular, to a red-emitting compound represented by the following formula (1) having high electroluminescent efficiency and improved thermal stability. Light compound: [0002] R 1 -CH=CH-X-CH=CH-R 2 [0003] where R 1 , R 2 and X are each as defined below. [0004] In addition, the present invention also relates to an organic electroluminescent device containing the red light-emitting compound, in particular to an organic electroluminescent device having one or more organic thin layers, the organic thin layer containing the first electrode and the second A light-emitting region formed between electrodes, wherein at least any one of the organic thin layers contains one or more compounds represented by the above-mentioned formula (1). Background technique [0005] The field of display devices is very important in the information ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C255/58C07D209/86C07D265/38C07D279/22C09K11/06H01L51/00H01L51/30H01L51/50H05B33/14
CPCC07C255/58C07D279/22H01L51/5012H01L51/0072C07D209/86H01L51/0071C09K2211/1029Y10S428/917C07D279/28C07D279/32C09K2211/1037C07D265/38C09K2211/1033C09K11/06H05B33/14H01L2251/308C09K2211/1014H01L51/0081H01L51/0059H10K85/631H10K85/657H10K85/6572H10K85/324H10K50/11H10K2102/103
Inventor 卓润兴韩允洙金麒东金相大金容瓘
Owner LG DISPLAY CO LTD
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