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Photoluminescent (PL) efficiency measurements are an essential component of the characterization of high efficiency organic light emitting devices. We demonstrate that a reverse bias technique for measuring PL efficiency possesses several advantages. Using a two-tone synchronous detection scheme, it is found that nonlinearities in the reverse bias photoresponse are a probe for the presence of charge...
Thin films of many molecular materials are considered `amorphous' because they possess no detectable long-range order. However, we show that the fluorescence spectrum of polar molecules may shift due to the formation of ordered polar domains within an otherwise amorphous film. A model is derived to explain this shift and the associated quenching of luminescence as domains are formed. We demonstrate...
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