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The effect of energy level offset between Ir dopant and carbazole hosts on the emission efficiency
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/content/aip/journal/apl/97/2/10.1063/1.3462931
2010-07-14
2014-08-23

Abstract

The interface energy offsets of various carbazole hosts and iridium(III) [bis(4,6-difluorophenyl) pyridinato-]-tetrakis(1-pyrazolyl)borate (FIr6) and their influence on the efficiency were investigated. Vacuum level shifted by for bis(4-(-carbazolyl)phenyl)dimethylsilane and FIr6 interface, which was negligible for other hosts and FIr6 interface. As a result, the hole injection from the host to the guest was almost barrier free to reach a high efficiency of 17.1% in the based device. It dropped to 14% when , -dicarbazolyl-3,5-benzene (mCP) was used as the host, which is the reminiscent of the existence of a hole injection barrier (−0.16 eV).

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Scitation: The effect of energy level offset between Ir dopant and carbazole hosts on the emission efficiency
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/2/10.1063/1.3462931
10.1063/1.3462931
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