Concentration Studies of the Praseodymium ~3P_0 Emission in SrAl_(12)O_(19):Pr~(3+)

摘要

Phosphor materials with a quantum efficiency greater than 100 % have been studied since 1974,when Piper et al.observed quantum cascade emission in YF_3:Pr~(3+)/1/.More recently,Srivastava and Beers reported quantum cascade emission in a Pr~(3+) doped oxide,SrAl_(12)O_(19):Pr~(3+) (SAP).In this talk we will focus on the concentration quenching of the Pr~(3+) emission in this system by studying the Pr~(3+) luminescence after pulsed excitation for dopant concentrations between 0.1 % and 15 % in the temperature range from 1.5 K to 300 K.While the relaxation of SAP with 0.1 % Pr~(3+) is found to be single exponential,samples with higher Pr~(3+) concentration display the (expected) non-exponential relaxation behavior due to cross relaxation between Pr~(3+) ions in close proximity (Fig.1).