Дефекты и перенос энергии в Sr-=SUB=-9-=/SUB=-Lu(PO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=-, легированном ионами Pr-=SUP=-3+-=/SUP=-

Abstract

In this work luminescence properties of crystalline powders of Sr9Lu(PO4)7 doped with Pr3+ ions were studied upon excitation in UV range in temperature range 5-320 K. Photoluminescence spectra show intensive emission corresponding to radiative interconfigurational 5d→4f electronic transitions, weak narrow lines of intraconfigurational 4f→4f transitions as well as emission of two types of crystal lattice defects. Upon pulsed excitation, timing characteristics of emission related to the impurity center and defects were studied, as well as temperature dependence of emission yield. The processes of energy transfer between impurity center and defects are discussed.