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Durham University

Research & business

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Publication details for Prof. J.A. Gareth Williams

Virgili, D., Cocchi, M., Fattori, Sabatini, C., Kalinowski, J. & Williams, J.A.G. (2006). Highly efficient exciplex phosphorescence from organic light-emitting diodes. Chemical Physics Letters 433(1-3): 145-149.

Author(s) from Durham

Abstract

The efficiency of organic exciplex light-emitting-devices (EXLEDs) can be greatly improved by introduction of a phosphorescent sensitizer with a high electronic affinity. In the electron–hole combination process at the electron donor/acceptor interface, solely singlet exciplexes are generated producing the exciplex fluorescence. A phosphor sensitizer allows the formation in the emitter bulk of triplet exciplexes, which yield highly efficient exciplex phosphorescence. As an example, we use a Pt-based phosphor (PtL2Cl) doped into a star-burst amine hole transporting donor (m-MTDATA) and bathophenanthroline (BPT) electron-transporting acceptor system which in a bi-layer EXLED reveals an exciplex high electro-phosphorescence external quantum yield of 2.4% photon/carrier.