Energy transfer relation of a novel Ce3＋/Pr3＋/Eu3＋ co-doped Sr2.975-xLaxAIO4＋xF1-x solid solution phosphor

The photoluminescence properties and energy transfer of a new Ce3+/ Pr3+/ Eu3+co-doped solid-solution composition of Sr2.975-xLaxAlO4+xF1-x(LSAF) phosphor are investigated. Upon doping Pr3+into lattices of LSAF:Ce host,a shoulder emission peak is observed at about 620 nm, owing to the transition of1D2→3H4. Addition of Eu3+to LSAF:Ce3+, Pr3+phosphor results in a sharp emission peaked at 675 nm for the5D0→7F3transition and an increase of the intensity of red emission for Pr3+with increasing Eu3+concentration. The pathways of energy transfer among Ce3+, Pr3+, and Eu3+are proposed to be responsible for color addition of a red component to the primary yellow emission,enabling a potential adjustable color for blue excitable warm white.