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Browse Journals & Magazines > Applied Physics Letters ...> Volume:87 Issue:19 Help

Enhancement of iridium-based organic light-emitting diodes by spatial doping of the hole transport layer

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7 Author(s)
Wang, Ying ; E. I. DuPont de Nemours and Co., Inc., P.O. Box 80356, Experimental Station, Wilmington, Delaware 19880-0356 ; Gao, Weiying ; Braun, Slawomir ; Salaneck, William R.
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The electroluminescence efficiency of Ir-based green emitter devices is very sensitive to the nature of the hole transport layer used. We show that by inserting a 1 nm layer of bis[4-(N,N-diethylamino)-2-methylphenyl](4-methylphenyl)methane (MPMP) in a 4,4′-bis-(carbazol-9-yl)biphenyl (CBP) hole transport layer, a device that combines the positive attributes of both MPMP (high efficiency) and CBP (low injection voltage) is obtained. These results can be understood based on a combined ultraviolet photoemission spectroscopy/inverse photoemission spectroscopy study, which reveals the very low electron affinity and superior electron blocking capability of MPMP.

Published in:
Applied Physics Letters  (Volume:87 ,  Issue: 19 )

Date of Publication: Nov 2005

Page(s):
193501 - 193501-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.2117623
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Nov 2005

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