查看文章

Self-trapped exciton emission spectra of four scheelite tungstate single crystals AWO₄ (A=Pb, Ca, Sr, Ba) were measured in a wide temperature range and their structure is discussed. We present decay kinetics of PbWO₄ in 0.35–300K range and a mathematical model, which successfully approximates temperature dependencies of the decay time and intensity with a unique set of parameters. Besides the usual thermal quenching also thermally induced exciton disintegration, which has been evidenced in earlier experiments, is considered.