@article{43e127b9a1d545d29ddc6100e4416504,
title = "Enhancement of iridium-based organic light-emitting diodes by spatial doping of the hole transport layer",
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.",
author = "Ying Wang and Weiying Gao and Slawomir Braun and Salaneck, {William R.} and Fabrice Amy and Calvin Chan and Antoine Kahn",
note = "Funding Information: The authors thank Dr. V. Grushin for providing the compound, and Dr. N. Herron for providing the MPMP compound. Technical assistance from C. Adams and G. Young is greatly appreciated. The Princeton group is grateful for support for this work by the National Science Foundation (DMR-0408589) and E. I. DuPont Corp. S.B. is supported by a contract with E. I. DuPont Corp. Research in Link{\"o}ping is supported by the European Commission within the Integrated Project NAIMO (NMP4-CT-2004-500355), the Swedish Research Council (VR), as well as the Center for Advanced Molecular Materials, CAMM, and the Center of Organic Electronics (COE), both of which are funded by the Swedish Foundation for Strategic Research, SSF.",
year = "2005",
month = nov,
day = "7",
doi = "10.1063/1.2117623",
language = "English (US)",
volume = "87",
pages = "1--3",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "19",
}