Effect of Lu3+doping on photoluminescence characteristics of Y2.691Gd0.3Al5O12:0.3at%Ce phosphor ceramics

In this paper, a series of (Y0.897-xLuxGd0.1)3Al5O12:0.3at%Ce (x = 0, 0.03, 0.09, 0.21, and 0.3) phosphor ceramics were prepared by vacuum sintering. The effect of Lu3+ doping on its structure and luminescence properties was studied in detail. With the increase of Lu3+ doping concentration, the crystal field was gradually weakened, and blueshift occurred in the photoluminescence (PL) spectrum. However, compared with Y3Al5O12:0.3at%Ce, the Y2.391Gd0.3Lu0.3Al5O12:0.3at%Ce phosphor ceramic still presents a 12 nm redshift. The phosphor conversion efficacy of the Y2.391Gd0.3Lu0.3Al5O12:0.3at%Ce phosphor ceramic is increased by 21% compared with Y2.691Gd0.3Al5O12:0.3at%Ce phosphor ceramics. In addition, The PL intensity of Y2.391Gd0.3Lu0.3Al5O12:0.3at%Ce phosphor ceramics at 150 degrees C is 83% of the PL intensity at room temperature. When the Lu3+ doping concentration is 10%, the PL quantum yield is 6% higher than that of Y2.691Gd0.3Al5O12:0.3at%Ce. The above results show that the Y2.691-xGd0.3LuxAl5O12:0.3at%Ce phosphor ceramic is a potential alternative to be applied to high power/high brightness phosphor converted solid state light sources.

Automated summary

In this study, a series of (Y0.897-xLuxGd0.1)3Al5O12:0.3at%Ce phosphor ceramics were prepared by vacuum sintering, and the effect of Lu3+ doping on their structure and luminescence properties was investigated. The results showed that Lu3+ doping weakened the crystal field and caused blueshift in the photoluminescence spectrum. The Y2.391Gd0.3Lu0.3Al5O12:0.3at%Ce phosphor ceramic exhibited a redshift compared to Y3Al5O12:0.3at%Ce. Additionally, the phosphor conversion efficacy and PL quantum yield of Y2.391Gd0.3Lu0.3Al5O12:0.3at%Ce were improved compared to Y2.691Gd0.3Al5O12:0.3at%Ce. These findings suggest that Y2.691-xGd0.3LuxAl5O12:0.3at%Ce phosphor ceramics have the potential to be used in high power/high brightness solid-state light sources.