Time-Resolved Luminescence from (La, Ce)PO4:Tb Phosphors

Abstract

Time-resolved spectra of Tb³⁺ emission have been investigated for highly Tb doped LaPO₄ phosphors under 365 nm excitation and ⁵D₃ emissions of Tb³⁺ at which decay constants much faster than that of ⁵D₄ were observed. Further new line emissions at around 600 nm were found in (La, Ce, Th)(PO₄,BO₃):Tb phosphor under 365 nm dye laser excitation. The mechanisms for the emissions were discussed, and it is considered that the emissions originated from Ce²⁺ as a result of the spectral structure and the decay time.