Enhanced Up-Conversion Emission of Er~(3+)-doped AI_2O_3 Powders by Y~(3+) Codoping Prepared in a Non-Aqueous Sol-Gel Process

摘要

1 mol% Er~(3+)- and 0-10 mol% Y~(3+)-codoped Al_2O_3 powders is prepared in a non-aqueous sol-gel method. Two crystalline types of doped Al_2O_3, C and θ, are obtained for the 0-10 mol% Y~(3+)-codoped Al_2O_3 powders sintered at the sintering temperature of 1000 ℃ by x-ray diffraction analysis. The green and red up-conversion emissions centered at about 550 and 670 nm increase with Y~(3+) codoping concentration, and the maximal intensity of both the green and red up-conversion emissions is obtained as about 100 and 10 times higher than that of the 1 mol% Er~(3+)-doped Al_2O_3 powders, respectively. The enhancement in the green and red up-conversion emissions is ascribed to the improved dispersion of Er~(3+) in Er~(3+)-Y~(3+)-codoped Al_2O_3 powders.