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Organic light emitting display device

a light-emitting display and organic technology, applied in the direction of thermoelectric device junction materials, semiconductor devices, electrical apparatus, etc., can solve the problems of high electron density in the light emission area, interface degradation and lifetime reduction, and the phosphorescent devices using two types of hosts and one type of dopants have not achieved lifetime improvement, etc., to achieve the effect of increasing the lifetime of the organic light-emitting display devi

Inactive Publication Date: 2016-06-09
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about an organic light emitting display device that can improve its lifetime. The device has two parts that emit light, and the second layer of the device includes two regions. The first region has a hole-type host and a first electron-type host to improve electron injection, while the second region has a different electron mobility from the first region to further improve the lifetime of the device. This design increases the number of electrons injected into the second layer and enhances the stability of the organic light emitting display device.

Problems solved by technology

However, phosphorescent devices using two types of host and one type of dopant have not achieved improvements in lifetime though phosphorescent devices have done in efficiency.
The cause of the interface degradation and lifetime reduction is the high electron density in the light emission area.
High electron densities move the light emission area toward the hole transport layer and exert electric stress on the dopant, thus accelerating the degradation.

Method used

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Examples

Experimental program
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embodiment 1

[0086]The organic light emitting display device has the same composition as Comparative Example, and includes a first yellow light emitting layer and a second yellow light emitting layer instead of the yellow light emitting layer. The first yellow light emitting layer is formed of a mixture of a CBP host and a B3PYMPM host (the ratio of the CBP host and the B3PYMPM host is 1:1), and the second yellow light emitting layer is formed of a mixture of a B3PYMPM host and a 3TPYMP host (the ratio of the B3PYMPM host and the 3TPYMP host is 3:7). The first and second yellow light emitting layer includes the first and second yellow-green light emitting layer. In the embodiments, the first electron-type host of the first yellow light emitting layer and the first electron-type host of the second yellow light emitting layer include the same material, but are not limited thereto. The first electron-type host of the first and second light emitting layers may be applied the same material or the dif...

embodiment 2

[0087]The organic light emitting display device has the same composition as Embodiment 1. The first yellow light emitting layer is formed of a mixture of a CBP host and a B3PYMPM host (the ratio of the CBP host and the B3PYMPM host is 1:1), and the second yellow light emitting layer is formed of a mixture of a B3PYMPM host and a 3TPYMP host (the ratio of the B3PYMPM host and the 3TPYMP host is 5:5). The first and second yellow light emitting layer includes the first and second yellow-green light emitting layer. In the embodiments, the first electron-type host of the first yellow light emitting layer and the first electron-type host of the second yellow light emitting layer include the same material, but are not limited thereto. The first electron-type host of the first and second light emitting layers may be applied the same material or the different material having the range of the LUMO levels and the electron mobility of the embodiments.

embodiment 3

[0088]The organic light emitting display device has the same composition as Embodiment 1. The first yellow light emitting layer is formed of a mixture of a CBP host and a B3PYMPM host (the ratio of the CBP host and the B3PYMPM host is 1:1), and the second yellow light emitting layer is formed of a mixture of a B3PYMPM host and a 3TPYMP host (the ratio of the B3PYMPM host and the 3TPYMP host is 7:3). The first and second yellow light emitting layer includes the first and second yellow-green light emitting layer. In the embodiments, the first electron-type host of the first yellow light emitting layer and the first electron-type host of the second yellow light emitting layer include the same material, but are not limited thereto. The first electron-type host of the first and second light emitting layers may be applied the same material or the different material having the range of the LUMO levels and the electron mobility of the embodiments.

[0089]The materials for the light emitting l...

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Abstract

An organic light emitting display device is disclosed. The organic light emitting display device includes a first light emitting part between an anode and a cathode, the first light emitting part having a first light emitting layer, and a second light emitting part between the first light emitting part and the cathode, the second light emitting part having a second light emitting layer and a third light emitting layer, wherein the second light emitting layer includes a hole-type host and a first electron-type host, and the third light emitting layer includes a first electron-type host and a second electron-type host.

Description

[0001]This application claims the priority benefit of Korean Patent Application No. 10-2014-0175347 filed on Dec. 8, 2014, which is incorporated herein by reference for all purposes as if fully set forth herein.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device which is capable of improving lifetime.[0004]2. Discussion of the Related Art[0005]Image displays used for displaying a variety of information on the screen are one of the core technologies of the information and communication era. Such image displays have been developed to be thinner, lighter, and more portable, and furthermore to have high performance. With the development of the information society, various demands for display devices are on the rise. To meet these demands, research on panel displays such as liquid crystal displays (LCD), plasma display panels (PDP), electroluminescent d...

Claims

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Application Information

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IPC IPC(8): H01L27/32
CPCH01L51/5092H01L27/3206H10K50/131H10K50/11H10K2101/40H10K2101/30H10K2101/90H10K59/32H10K50/13H10K50/19H10K50/12H10K50/125H10K59/30H10K50/171H10K2101/00
Inventor JANG, JAESEUNGSONG, JAEILKIM, DONGHYUK
Owner LG DISPLAY CO LTD
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