The upconversion luminescences of YAlO3：Er3＋ phosphor co-doping with different Gd3＋ concentrations are investigated under the excitation of 980- and 532-nm diode lasers. A near ultraviolet upconversion emission at ...The upconversion luminescences of YAlO3：Er3＋ phosphor co-doping with different Gd3＋ concentrations are investigated under the excitation of 980- and 532-nm diode lasers. A near ultraviolet upconversion emission at 410 nm is observed in YAlO3 under 532-nm excitation. Moreover, the inactive Gd3＋ ions can improve the upconversion intensity efficiently in a certain range of concentration. Under 980-nm excitation, the visible upconversion emissions at 546 and 646 nm are enhanced by about 10 and 8 times at the Gd3＋ concentration of 40%, respectively. The upconversion emission at 410 nm under 532-nm excitation is also enhanced by 7 times. The substitution of Gd3＋ ions for Y3＋ sites changes the local symmetry of Er3＋, leading to the improvement of upconversion efficiency.展开更多
基金supported by the Scientific Research Fund of Hunan Provincial Education Department (Nos.10A120 and 11B117)the Hunan Provincial Natural Science Foundation of China (No. 10JJ6012)
文摘The upconversion luminescences of YAlO3：Er3＋ phosphor co-doping with different Gd3＋ concentrations are investigated under the excitation of 980- and 532-nm diode lasers. A near ultraviolet upconversion emission at 410 nm is observed in YAlO3 under 532-nm excitation. Moreover, the inactive Gd3＋ ions can improve the upconversion intensity efficiently in a certain range of concentration. Under 980-nm excitation, the visible upconversion emissions at 546 and 646 nm are enhanced by about 10 and 8 times at the Gd3＋ concentration of 40%, respectively. The upconversion emission at 410 nm under 532-nm excitation is also enhanced by 7 times. The substitution of Gd3＋ ions for Y3＋ sites changes the local symmetry of Er3＋, leading to the improvement of upconversion efficiency.
