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Organic light emitting device

An organic light-emitting device, device technology, applied in the direction of organic semiconductor devices, light-emitting materials, electric solid-state devices, etc., can solve the problems of driving voltage exceeding the predetermined value, not suitable for commercial applications, OLED lack of working stability, etc.

Inactive Publication Date: 2006-11-08
LG PHILIPS LCD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the OLEDs lack sufficient working stability, which may make them unsuitable for commercial applications
By employing mixed light-emitting layer OLEDs, high operational stability has been achieved, but the driving voltage often exceeds a predetermined value, such as 5V

Method used

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  • Organic light emitting device
  • Organic light emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] The following examples are illustrative and not limiting of the invention.

[0040]

device

pieces

make up

No

HTL 1

EL 2

ETL 3

at 25mA / cm 2 lower efficiency

31.25mA / c

m 2 steady

Qualitative

in hours

unit calculation

out of the initial

brightness

500cd / m 2

the t 1 / 2

brightness

(cd /

cm 2 )

to drive

move

Electricity

to press

(V

)

CIE

coordinates

(Yan

color)

initial

brightness

(Lo

)

(cd /

cm 2 )

t 1 / 2

(

small

Time)

1

NPB 4 +5%

Rubrene (40nm)

BH2 5 +2%BD 2 6

(10nm)

T1(45nm)

576

4.46

0.200,

0.265

(blue)

703

...

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PUM

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Abstract

The present invention relates to organic light emitting devices (OLEDs) comprising an electroluminescent material layer comprising a mixture of at least two materials having different electron and hole transport capacities, and an electron transport layer comprising a triazine. Display devices comprising the OLEDs are also disclosed.

Description

technical field [0001] The present invention relates to organic light emitting devices. Background technique [0002] Organic Light Emitting Devices (OLEDs) represent a more promising technology in the field of display applications. A conventional device structure contains (1) a transparent front electrode; (2) a multilayer organic light emitting region (typically at least two layers) containing at least a small molecule or polymer organic electroluminescent material; and (3) a back electrode. OLEDs are usually laminated on a substrate. One of the front and rear electrodes is an electron injection cathode, and the other is a hole injection anode. When a voltage is applied across the electrodes, the light emitted from the light-emitting area is conveyed to the observer through the transparent front electrode. Typically, the light-emitting region contains: (1) at least one layer of electron transport material near the cathode; (2) at least one layer of hole transport materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54H05B33/12
CPCH10K85/654H10K50/11H10K2102/351H05B33/14H10K59/00C09K11/06H05B33/22Y02B20/30Y10S428/917H10K50/16
Inventor H·阿兹兹波波维克J·A·科甘胡南星
Owner LG PHILIPS LCD CO LTD