Fluorescence self-quenching in aromatic vapours; the role of excited dimers

摘要: At temperatures sufficiently high to produce an appreciable pressure of 9, 10-diphenylanthracene, perylene or pyrene, the quantum yield fluorescence is found be independent vapour pressure. The negative temperature coefficient self-quenching in anthracene explained terms dissociation excited dimer which also responsible for delayed fluorescence. pressure-dependence lifetime at low pressures shown consistent with a pressure-independent quenching constant if second-order becomes first-order higher pressures.