Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2993326
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Funding
- CityU Strategic Research [7001986]
- NNSF of China [20502013, 60778033]
- Chinese Academy of Sciences
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We studied the performance of exciplex-based organic light-emitting devices (OLEDs) made of different electron transporting materials (ETMs) with similar electron affinities to minimize the effect of the lowest unoccupied molecular orbital levels. A strong correlation was observed between the intensity of exciplex emission and the choice of ETMs. The intensity of exciplex emission relied on interfacial charge accumulation densities at organic/organic contacts, which in turn determined device color and efficiency. Contrary to common belief, highly efficient exciplex-based OLEDs can be achieved, provided that the involved organic materials have high carrier mobility, high photoluminescence quantum yield, and suitable electron energy levels. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2993326]
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