Synthesis and photoluminescence properties of Sr3(PO4)2:Re3+, Li+ (Re = Eu, Sm) red phosphors for white light-emitting diodes

Abstract Sr 3 (PO 4 ) 2 :Re 3+ , Li + (Re = Eu, Sm) red phosphors were prepared via a high temperature solid state reaction, and their structure and luminescence properties were investigated. X-ray diffraction patterns indicate that the phase of as-prepared samples is in good agreement with standard Sr 3 (PO 4 ) 2 structure. Under 395 nm excitation, the emission of Sr 3 (PO 4 ) 2 :Eu 3+ consists of a strong peak centered at 622 nm and two weak peaks centered at 598 nm and 660 nm, which correspond to 5 D 0 → 7 F 2 , 5 D 0 → 7 F 1 and 5 D 0 → 7 F 3 transitions, respectively. Also, the emission spectrum of Sr 3 (PO 4 ) 2 :Sm 3+ shows three main peaks at 568 nm, 603 nm and 651 nm, which are attributed to 4 G 5/2 → 6 H I/2 (I = 5, 7, 9) transitions of Sm 3+ . Furthermore, luminescence properties of Sr 3 (PO 4 ) 2 :Re 3+ , Li + (Re = Eu, Sm) samples are enhanced significantly by Li + ions doping as charge compensator. Results indicate that as-prepared Sr 3 (PO 4 ) 2 :Re 3+ , Li + (Re = Eu, Sm) could be the potential red phosphors used in white light-emitting diodes.