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White organic light-emitting diodes based on spectral broadening electroluminescence due to formation of interfacial exciplexes
, Y.N. Mohapatra, M. Qureshi, S.S. Manoharan
Published in
Volume: 86
Issue: 11
Pages: 1 - 3
We demonstrate white organic light-emitting diodes (OLEDs) having spectral width of approximately 260 nm in electroluminescence (EL) in a simple bilayer structure, consisting of TPD and zinc benzothiazole, without taking recourse to complex strategies such as blending and doping. The EL is broader than the corresponding photoluminescence (PL) of both component materials and their structures. A deconvolution of PL and EL spectra shows that as large as 60% of the broad EL emission originates from multiple exciplexes formed at the interface during electrical excitation. © 2005 American Institute of Physics.
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