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

Ying Wang, Weiying Gao, Slawomir Braun, William R. Salaneck, Fabrice Amy, Calvin Chan, Antoine Kahn

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number193501
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number19
DOIs
StatePublished - Nov 7 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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