Time- and Wavelength-Resolved Delayed-Fluorescence Emission from Acridine Yellow in an Inhomogeneous Saccharide Glass

作者: Julius C. Fister , Joel M. Harris

DOI: 10.1021/AC950738C

关键词: Singlet fissionAcridine yellowChemistryExcited stateSinglet stateIntersystem crossingPhosphorescencePopulationTriplet statePhotochemistry

摘要: Multiwavelength time-resolved spectroscopy is employed to study the triplet-state photophysics of acridine yellow dissolved in a rigid saccharide glass. Activated reverse intersystem crossing from photoexcited triplet states fluorescent singlet state provides temperature-dependent decay pathway population. While unimolecular relaxation homogeneous excited population would result single-exponential delayed-fluorescence intensity, nonexponential was observed at all temperatures. Multidimensional regression analysis time- and wavelength-resolved fluorescence phosphorescence emission found be powerful method investigate an inhomogeneous matrix, where two discrete populations are found. From temperature dependence their rates, energy barriers activated determined compared triplet−singlet gaps determine...

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