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Organic electroluminescent device

An electroluminescent device, electroluminescent technology

Active Publication Date: 2011-08-31
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the process of realizing organic electroluminescent devices to emit green light, the biggest problem is the reduction of color purity and luminous efficiency
[0011] Conventional green light-emitting materials have the following problems: long-wavelength light is emitted during light emission; and the higher the doping density, the more the color purity of light and the luminous efficiency decrease

Method used

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  • Organic electroluminescent device
  • Organic electroluminescent device
  • Organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0080] The ITO glass was embossed to a size of 3mm x 3mm. The patterned ITO glass was cleaned.

[0081] The substrate is located at a base pressure set to 1×10 -6 CuPC was sequentially deposited on ITO in a torr vacuum chamber (200 ), NPB (500 ), luminous layer (300 ), Alq 3 (500 ), LiF (5 ) and Al (1,000 ).

[0082] Wherein, the first matrix of the light-emitting layer includes the following materials, and the mixing ratio of matrix and impurities is 1:0.01.

[0083]

[0084] Matrix-1

no. 1 approach

[0086] When using the dopant of chemical formula G-2, when the current is about 1mA, the voltage is about 7.48v, and the brightness is about 1527cd / m 2 , thus CIE (Commission Internationale de L'Eclairage, International Commission on Illumination) x=0.220, y=0.555.

no. 2 approach

[0088] When using the dopant of chemical formula G-3, when the current is about 1mA, the voltage is about 7.12v, and the brightness is about 1445cd / m 2 , thus CIE x=0.254, y=0.619.

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Abstract

Disclosed is an organic electroluminescent device including a substrate, a first and second electrode formed on the substrate, and a light-emitting layer formed between the first electrode and the second electrode, The light-emitting layer having a plurality of materials and and being green luminescent material using a chemical Formula I as a dopant. Formula (I) Wherein at least one of A1 and A2 is selected from a substituted or non-substituted aromatic group, a heterocyclic group, an aliphatic group, and hydrogen.

Description

technical field [0001] The present invention relates to an organic electroluminescent device, and more specifically, the present invention relates to a green light-emitting material for a light-emitting layer. Background technique [0002] Recently, with the tendency for display devices to become larger in size, demand for flat panel display devices occupying a small area has increased. One example of a flat panel display device is an organic electroluminescent device, also known as an organic light emitting diode (OLED). Also, the organic electroluminescent display technology is developing rapidly, and thus various prototypes are already on the market. [0003] An organic electroluminescence device emits light in such a way that charges are injected into an organic layer formed between a cathode and an anode to form pairs of electrons and holes, thereby generating excitons, which fall from an excited state to a ground state of the excitons. glow. [0004] Compared with p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06H05B33/14H05B33/18
CPCH05B33/14Y10S428/917C09K2211/1014C09K2211/1007C09K2211/1011H10K85/621H10K85/615H10K85/631H10K50/11
Inventor 徐正大金憘廷李敬勋吴炯润金明燮朴春键
Owner LG DISPLAY CO LTD