Enhancement of yellow persistent luminescence in Eu2+-doped β-Ba3P4O13 phosphor by Ga3+ codoping

Abstract

Novel yellow emitting persistent phosphors β-Ba₃P₄O₁₃:Eu²⁺ and β-Ba₃P₄O₁₃:Eu²⁺,Ga³⁺ were successfully synthesized via solid-reaction method. Ga³⁺ was proved to be an effective codopant to enhance persistent luminescence in Eu²⁺-doped β-Ba₃P₄O₁₃ phosphors. Eu²⁺–Ga³⁺ codoped β-Ba₃P₄O₁₃ showed about 6 times longer persistence time than the Eu²⁺-singly-doped phosphors. The yellow long persistent luminescence (LPL) of β-Ba₃P₄O₁₃:Eu²⁺,Ga³⁺ can persist about 10 h. The thermoluminescence (TL) analyses showed that co-doping Ga³⁺ can improve more appropriate traps leading to the enhancement of the afterglow. These results suggested that Ga³⁺ may play a critical role in creating traps in β-Ba₃P₄O₁₃:Eu²⁺.