Synthesis and photoluminescence properties of Ca19Mg2(PO4)14:Sm3+ red phosphor for white light emitting diodes

Abstract A series of Sm 3+ doped Ca 19 Mg 2 (PO 4 ) 14 red phosphors were successfully synthesized. X-ray diffraction analysis indicates that all the samples are single phased. The luminescence property is investigated in detail by measuring their photoluminescence excitation and emission spectra. Ca 19 Mg 2 (PO 4 ) 14 :Sm 3+ phosphors show strong absorption in 400–410 nm region, which is suitable for application in LEDs. When excited at 403 nm, Ca 19 Mg 2 (PO 4 ) 14 :Sm 3+ phosphor can emit red emission with CIE chromaticity coordinates (0.615, 0.384). The optimal doping concentration of Sm 3+ doped Ca 19 Mg 2 (PO 4 ) 14 is measured to be 0.02. The thermal quenching property is also measured and compared with the commercial red phosphor Y 2 O 3 :Eu 3+ (Topstar, TXC-RIA). The results indicate Ca 19 Mg 2 (PO 4 ) 14 :Sm 3+ phosphors have potential to serve as a red phosphor for white LEDs.