Effects of particle size and type of alumina on the morphology and photoluminescence properties of Sr4 Al14 O25: Eu2+ /Dy3+ phosphor

Abstract

Sr4 Al14 O25: Eu2+ /Dy 3+ phosphor with high luminescence intensity and long afterglow duration was synthesized using 1.0 m (), 0.1 m (), and 0.05 m () particle sizes of Al2 O3. SEM observation results showed that spike-like thin particles were formed when 0.05 m - Al2 O3 was used as raw material. Hexagonal thick particles were observed when 0.1 m - Al 2 O3 was used. But irregular, thin particles were observed while using 1 m -Al2O3. Photoluminescence measurements showed that both the initial intensity and the long persistency were much higher for the phosphor prepared using - Al2 O3 of 0.05 m particle size.