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Sei-Yong Kim, Won-Ik Jeong, Christian Mayr, Young-Seo Park, Kwon-Hyeon Kim, Jeong-Hwan Lee, Chang-Ki Moon, Wolfgang Brütting and Jang-Joo Kim Organic Light-Emitting Diodes with 30% External Quantum Efficiency Based on a Horizontally Oriented Emitter Advanced Functional Materials 23

Version of Record online: 27 MAR 2013 | DOI: 10.1002/adfm.201300104

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High-efficiency phosphorescent organic light-emitting diodes (OLEDs) doped with Ir(ppy)2(acac) in an exciplex forming co-host have a preferred horizontal emitter orientation. Based on optical analysis a maximum efficiency of the OLEDs of about 30% is calculated, which matches very well with the experimental data. Furthermore, a simple method to predict the maximum efficiency achievable with a certain emitting dye in a host matrix is suggested.

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