OLEDS HAVING INCREASED EXTERNAL ELECTROLUMINESCENCE QUANTUM EFFICIENCIES

WIPO Patent Application WO2003061028

A3

OLED devices are disclosed having increased external electroluminescence quantum efficiencies, i.e., increased "out-coupling" efficiencies. OLED devices that have increased out-coupling efficiencies and that are also protected from environmental elements such as moisture and oxygen are also disclosed. The OLED device of the present invention comprises a substrate (110); an active region (180) positioned on the substrate, wherein the active region comprises an anode layer (130), a cathode layer (150) and a light-emitting layer (140) disposed between the anode layer and the cathode layer; and a polymeric layer (120) disposed (a) over the active region, (b) under the active region or (c) both over and under the active region. The polymeric layer (120) has microparticles (170) incorporated therein, and the microparticles are effective to increase the out-coupling efficiency of the OLED. In one embodiment, the OLED device comprises a composite barrier layer and the microparticles are incorporated in a polymeric planarizing sublayer of the composite barrier layer. The composite barrier layer in this embodiment also protects the OLED from damage caused by environmental elements such as moisture and/or oxygen.

WEAVER MICHAEL S
BULOVIC VLADIMIR
LU MIN-HAO MICHAEL

PCT/US2003/000400

December 11, 2003

January 08, 2003

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UNIVERSAL DISPLAY CORP (US)

H01L51/52; (IPC1-7): H01L51/20

WO1998017083A1	1998-04-23
WO2000076008A1	2000-12-14
WO2002037580A1	2002-05-10

EP1116987A2	2001-07-18
US5757126A	1998-05-26

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