Enhanced Up-Conversion Emission of Er3+-Doped Al2O3 Powders by Y3+ Codoping Prepared in a Non-Aqueous Sol-Gel Process
1 mol% Er3+- and 0–10 mol% Y3+-codoped Al2O3 powders is prepared in a non-aqueous sol–gel method. Two crystalline types of doped Al2O3, and θ, are obtained for the 0–10 mol% Y3+-codoped Al2O3 powders sintered at the sintering temperature of 1000 °C by x-ray diffraction analysis. The green and red up-conversion emissions centered at about 550 and 670 nm increase with Y3+ 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% Er3+-doped Al2O3 powders, respectively. The enhancement in the green and red up-conversion emissions is ascribed to the improved dispersion of Er3+ in Er3+–Y3+-codoped Al2O3 powders.
M.K. Lei, X.P. Zhu, K.W. Xu and B.S. Xu
H. Wang and M.K. Lei, "Enhanced Up-Conversion Emission of Er3+-Doped Al2O3 Powders by Y3+ Codoping Prepared in a Non-Aqueous Sol-Gel Process", Key Engineering Materials, Vols. 373-374, pp. 621-624, 2008