Modulating the emission spectrum of Ca2La8(SiO4)6O2:Eu(2+,3+) phosphor through Mn2+ion doping

A series of Ca1.9-xLa8(SiO4)(6)O-2:0.1Eu((2+,3+)), xMn(2+) (0 <= x <= 0.10) phosphors were successfully prepared by high-temperature solid-phase method, and the effect of Mn2+ doping on the crystal structure and luminescence properties of phosphor Ca2La8(SiO4)(6)O-2:Eu-(2+,Eu-3+) was systematically studied. The series of samples are oxyapatite structure, belonging to hexagonal system, and the space group is P6(3)/m(176) or P-3. The excitation spectrum of Ca1.9-xLa8(SiO4)(6)O-2:0.1Eu((2+,3+)()), xMn(2+) ranges from 200 to 450 nm. It is composed of a broadband spectrum formed by the charge transition of Eu3+ and Eu2+, and a sharp line spectrum formed by the F-7(0) electronic transition of Eu3+. The emission spectrum of Ca1.9-xLa8(SiO4)(6)O-2:0.1Eu((2+,3+)), xMn(2+) ranges from 550 to 750 nm. When the concentration of Mn2+ x >= 0.04, the emission of D-5(1) (538 nm, 556 nm) of Eu3+ successfully activates the emission of Mn2+ and realizes energy transfer. The valence states of Eu and Mn in the phosphors were analyzed by XPS spectra. The emission light of Ca1.9-xLa8(SiO4)(6)O-2:0.1Eu((2+,3+)), xMn(2+) phosphors move from the yellow light area (0.4631, 0.4780)to the orange-red light area (0.5539, 0.3554) by controlling the Mn2+ doping, and the color temperature of the samples are all around 2500 K.