Upconversion Luminescence of SrTiO3：Er^3＋ Ultrafine Powders Produced by 785 nm Laser

Er3+ 做的 SrTiO3 极其细小的粉末被稳固的州的反应在熔融的 NaCl 流动准备。结构的性质被 X 光检查衍射，地排放扫描电子显微镜学，和 Fourier 变换描绘红外线的光谱学。在 SrTiO3 的 Er3+ 的 Stokes 排放系列：从绿色接近红外线的区域的 Er3+ 在 514.5 nm 激光刺激下面被调查。Er3+ 的绿、红的 upconverted 光系列被 785 nm 激光在刺激下面测量进 4I9/2 水平。upconversion 机制通过激光力量依赖和 upconverted 排出物的 Er3+ 离子集中依赖详细被学习，并且结果证明激动的州的吸收和精力转移过程是为 upconversion 的可能的机制。upconversion 性质显示那 SrTiO3 :Er3+ 可以在 upconversion 黄磷被使用。

Er^3＋ doped SrTiO3 ultrafine powders were prepared by solid state reaction in a molten NaCl flux. The structural properties were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. The Stokes emission spectra of Er^3＋ in SrTiO3：Er^3＋ ranging from green to near infrared region were investigated under 514.5 nm laser excitation. The green and red upconverted luminescence spectra of Er^3＋ were measured under excitation into the 419/2 level by 785 nm laser. The upconversion mechanisms were studied in detail through laser power dependence and Er^3＋ ion concentration dependence of upconverted emissions, and results show that excited state absorption and energy transfer process are the possible mechanisms for the upconversion. The upconversion properties indicate that SrTiO3：Er^3＋ may be used in upconversion phosphors.