title: Emission red shift and unusual band narrowing of Mn2+ in NaCaPO4 phosphor.
abstract: Concentration dependence of Mn(2+) luminescence in NaCaPO(4)/Mn(2+) is investigated by structural analyses and optical and laser excitation spectroscopies in the temperature range 19-300 K. NaCaPO(4)/Mn(2+) forms solid solution over the Mn(2+) concentration range 1.0-22 mol %. We observe the red shift and unusual band narrowing of Mn(2+) emission by increasing Mn(2+) concentration in NaCaPO(4). The lifetime of Mn(2+) emission lengthens unexpectedly for higher Mn(2+) concentration. The results are discussed in relation with crystal structure, photon reabsorption, exchange interaction, and energy transfer and energy migration in NaCaPO(4)/Mn(2+).
authors.affiliation: Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea.
authors.forename: Liang
authors.initials: L
authors.lastname: Shi
authors.forename: Yanlin
authors.initials: Y
authors.lastname: Huang
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Seo