Abstract
Oxides based upconversion hosts are highly desirable due to their chemical stability and low cost. In this paper, Bi2Ti2O7:Er nanoparticles with different molar ratios of Bi3+ and Er3+ (Bi3+:Er3+ = 1:1, 3:1, 6:1, 8:1 and 10:1) were fabricated by sol-gel method. By annealing powder samples at different temperatures, the best heat treatment temperature was 800 °C. The upconversion property of Bi2Ti2O7:Er was studied under a 980 nm laser extinction. The results revealed that the color of Bi2Ti2O7 nanoparticles changed from green to red with increasing concentration of Er3+. The green and red emission can be attributed to the transition of 2H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2, respectively. All the luminescence can be seen by naked eyes even the laser power as low as 40 mW.
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