Investigation of photoluminescence properties, quenching mechanism and thermal stability of the red-emitting phosphor based on Eu ions doped apatite host NaLa9(SiO4)6O2

A series of Eu ions doped apatite structure NaLa9(1-x)Eu9x(SiO4)(6)O-2 phosphors were successfully synthesized by solid state reaction. The phase structure and luminescence properties morphology of the NaLa9(1-x)Eu9x(SiO4)(6)O-2 phosphors were systemically investigated. The results indicate that all the samples adopt NaLa9(SiO4)(6)O-2 phase and can be effectively excited byUVlight or blue light to realize an intense red emission (615 nm). The quenching concentration for the transition of D-5(0) -> F-7(2) in the NaLa9(1-x)Eu9x(SiO4)(6)O-2 phosphor reaches up x = 0.7. The theoretical quenching concentration, quenching mechanism and thermal stability were also discussed. The as-prepared phosphors can compensate for the deficiency of the red emitting region of YAG:Ce3+ phosphor. The results show that NaLa9(1-x)Eu-9x(SiO4)(6)O-2 phosphor has potential application in solid state lighting.