Characteristics of emissive bilayers in electrophosphorescent organic light-emitting diodes

New electrophosphorescent organic light-emitting diodes were fabricated by polymer/Ir(ppy)3 bilayers. Already several groups have reported polymer systems that show efficient energy transfer from a polymer host to an organometallic guest. We have fabricated a phosphorescent polymer light-emitting de...

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Bibliographic Details
Published in:Current applied physics 2006, 6(4), , pp.658-662
Main Authors: Chang, Bum Jin, Park, Jong Hyeok, Lee, Kwang Hee, Kim, Yong Chul, Yu, Jae-Woong, Kim, Jai Kyeong
Format: Article
Language:English
Subjects:
Bilayer
Electrophosphorescence
Energy transfer
Light-emitting diodes
PVK
물리학
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Summary:New electrophosphorescent organic light-emitting diodes were fabricated by polymer/Ir(ppy)3 bilayers. Already several groups have reported polymer systems that show efficient energy transfer from a polymer host to an organometallic guest. We have fabricated a phosphorescent polymer light-emitting device with fac tris(2-phenylpyridine)iridium [Ir(ppy)3] as a triplet emissive layer on a poly(vinylcarbazole) (PVK) layer. The emission spectrum of the bilayer device exhibited pure Ir(ppy)3 emission, which indicates that the efficient energy transfer from PVK layer to Ir(ppy)3 layer. Our bilayer device system shows a lower driving voltage and a higher current density than those of the general blended device.
ISSN:1567-1739
1878-1675
DOI:10.1016/j.cap.2005.04.015