Abstract:
Red phosphors K
1-xAlSi
2O
6∶
xEu
3+ (
x=0.01, 0.03, 0.05, 0.07, 0.09, 0.11, the same as below) and K
0.93-xAlSi
2O
6∶(0.07Eu
3++
xLa
3+)were prepared by high temperature solid-state method. The effects of La
3+/Eu
3+ doping on luminescence intensity, fluorescence lifetime and color coordinate were studied. The results show that both Eu
3+ doped and Eu
3++La
3+ doped KAlSi
2O
6 red phosphors were leucite phase, and no new phase was found. With the increase of Eu3
+ doping, the leucite phase of KAlSi
2O
6 red phosphor changed from tetragonal structure to cubic structure. With the increase of Eu
3+ doping, the luminous intensity of KAlSi
2O
6 red phosphor increased first and then decreased, and the intensity was the highest when the mole fraction of Eu
3+ was 0.07. With the increase of La
3+ doping, the luminous intensity of K
0.93AlSi
2O
6∶0.07Eu
3+ red phosphor increased first and then decreased. When the mole fractiont of La
3+ was 0.09, the intensity was the highest, which was more than twice as much as that of Eu
3+ with single doping mole fraction of 0.07. Compared with the single doping mole fraction of 0.07Eu
3+, the fluorescence lifetime of KAlSi
2O
6 based red phosphors both doped with 0.07Eu
3+ and 0.09La
3+ was longer, and the color coordinate moved from orange to red, and the red component was more obvious. The doping of La
3+ could significantly improve the luminescence performance of the phosphor, and showed excellent red emission performance under appropriate doping amount.