Instrument response standard in time-resolved fluorescence Rev. Sci. Instrum. 80, 033109 (2009); 10.1063/1.3095677Alkali-helium exciplex formation on the surface of helium nanodroplets. II. A time-resolved study A time-resolved measurement system for electrofluorescence spectra ͑plots of electric-field-induced change in fluorescence intensity as a function of wavelength͒ has been constructed by combining the time-correlated single-photon-counting system for emission decay measurement with modulated electric field as a sample bias. Four fluorescence decays, which correspond to positive, zero, negative, and zero sample bias, respectively, can be measured simultaneously, and a small field-induced change in decay profile can be detected precisely by using the constructed system. Measurements of time-resolved electrofluorescence spectra have been performed in electron donoracceptor compounds which show a photoinduced electron transfer.
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