White organic light-emitting diodes based on spectral broadening in electroluminescence due to formation of interfacial exciplexes

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 t...

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Bibliographic Details
Published in:Applied physics letters 2005-03, Vol.86 (11)
Main Authors: Singh, Samarendra P., Mohapatra, Y. N., Qureshi, M., Sundar Manoharan, S.
Format: Article
Language:English
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1884255