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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/9198

Title: Enhanced performance of organic light-emitting diodes by inserting wide-energy-gap interlayer between hole-transport layer and light-emitting layer
Authors: Honda, Yusuke
Matsushima, Toshinori
Murata, Hideyuki
Keywords: Organic light-emitting diode
Singlet-polaron annihilation
Carrier recombination efficiency
Unstable α-NPD excitons
Issue Date: 2009-07-09
Publisher: Elsevier
Magazine name: Thin Solid Films
Volume: 518
Number: 2
Start page: 545
End page: 547
DOI: 10.1016/j.tsf.2009.07.016
Abstract: We demonstrated that driving voltages, external quantum efficiencies, and power conversion efficiencies of organic light-emitting diodes (OLEDs) are improved by inserting a wide-energy-gap interlayer of (4,4′-N,N′-dicarbazole)biphenyl (CBP) between a hole-transport layer of N,N-di(naphthalen-1-yl)-N,N′-diphenyl-benzidine (α-NPD) and a light-emitting layer of tris(8-hydroxyquinoline)aluminum. By optimization of CBP thicknesses, the device with a 3-nm-thick CBP layer had the lowest driving voltage and the highest power conversion efficiency among the OLEDs. We attributed these improvements to enhancement of a carrier recombination efficiency and suppression of exciton–polaron annihilation. Moreover, we found that the degradation of the OLEDs is caused by decomposition of CBP molecules and excited-state α-NPD molecules.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Yusuke Honda, Toshinori Matsushima, Hideyuki Murata, Thin Solid Films, 518(2), 2009, 545-547, http://dx.doi.org/10.1016/j.tsf.2009.07.016
URI: http://hdl.handle.net/10119/9198
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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