Organic electroluminescent display device having plural...

Details Organic electroluminescent display device having plural... Organic electroluminescent display device having plural...

2007-06-19

2007-06-19

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S504000

Reexamination Certificate

active

11020394

ABSTRACT:
In an organic EL device disclosed, there are stacked sequentially on a glass substrate an anode, a first carrier transportation layer, a second carrier transportation layer, a light emission layer, a third carrier transportation layer, a fourth carrier transportation layer, an electron transportation layer, and a cathode. The first carrier transportation layer is formed from a material having an ionization potential Ip lower than the ionization potential Ip of the second carrier transportation layer, and the third carrier transportation layer is formed from a material having an electron affinity Ea less than the electron affinity Ea of the fourth carrier transportation layer.

REFERENCES:
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patent: 2003/0064246 (2003-04-01), Kim et al.
patent: 5-326146 (1993-12-01), None
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patent: 7-110500 (1995-04-01), None
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patent: 2001-71558 (2001-03-01), None
patent: 2001-176667 (2001-06-01), None
Korean Office Action dated Aug. 31, 2006, issued in corresponding Korean Patent Application No. 10-2005-7001022.

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