期刊
AIP ADVANCES
卷 2, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3679428
关键词
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资金
- ERC [20100009882]
- National Research Foundation (NRF) of Korea [2010-0024809]
- Korea Ministry of Education, Science and Technology (MEST)
- National Research Foundation of Korea [2010-0009882, 2010-0024809] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We demonstrate red phosphorescent organic light-emitting diodes (OLEDs) with multiple quantum well structures which confine triplet exciton inside an emitting layer (EML) region. Five types of OLEDs, from a single to five quantum wells, are fabricated with charge control layers to produce high efficiencies, and the performance of the devices is investigated. The improved quantum efficiency and lifetime of the OLED with four quantum wells, and its suppressed quantum efficiency roll-off of 17.6%, can be described by the increased electron-hole charge balance owing to the bipolar property as well as the efficient triplet exciton confinement within each EML, and by prevention of serious triplet-triplet and/or triplet-polaron annihilation as well as the Forster self-quenching due to charge control layers. Copyright 2012 Author(s). This article is distributed under a Creative Commons Attribution 3.0 Unported License. [doi: 10.1063/1.3679428]
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