Structure and Photoluminescence Properties of Ca 9 Al(PO 4 ) 7 : Ce 3+ , Mn 2+ Phosphors

Abstract

A series of single-phased color-tunable phosphors Ca9Al(PO4)7: xCe3+, yMn2+(0≤x≤0.03, 0≤y≤0.07) (CAP: xCe3+, yMn2+) were synthesized by solid state reaction. The obtained phosphors exhibit a broad excitation band ranging from 250 to 350 nm and two emission bands centered at about 350 and 645 nm upon 315 nm excitation. Energy transfer mechanism from Ce3+to Mn2+in CAP was studied by luminescence spectra, energy-transfer efficiency and lifetimes. Through effective energy transfer, a color-tunable emission varied from purplish red through orange and finally to red can be realized by adjusting the ratio of Ce3+to Mn2+. Our results indicate the novel CAP: Ce3+, Mn2+can serve as a good candidate for red emitting phosphor. © 2012 The Electrochemical Society.