Luminescence studies during combustion synthesis of a long afterglow phosphor Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺

Abstract

The long glow persistent phosphor Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺ has been synthesized through combustion route. SrAl₄O₇ and SrAl₂O₄ are identified as the intermediate products formed at different temperatures during the synthesis of Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺. The photoluminescence and afterglow emission of the intermediate products have been systematically studied. The photoluminescence and afterglow emission profiles of the intermediate products varied with the temperature of synthesis. For a sample with similar aluminate phases (at a particular synthesis temperature) the λ_AGL and λ_PL are different. However, for Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺ annealed at 1200-1300ºC, the AGL and PL emissions are similar.