Approaches for achieving highly efficient exciplex-based organic light-emitting devices

Lai, S. L.; Chan, M. Y.; Tong, Q. X.; Fung, M. K.; Wang, P. F.; Lee, C. S.; Lee, S. T.
October 2008
Applied Physics Letters;10/6/2008, Vol. 93 Issue 14, p143301
Academic Journal
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.


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