Li^+和稀土离子共掺ZrO_2上转换发光特性  

Up-conversion luminescence properties of Li^+ and rare earth ions co-doped ZrO_2 nanocrystalline powders

作　　者：黄传海[1] 王玉晓[1] 张学如[1] 杨昆[1] 刘禄[1] 宋瑛林[1] 

机构地区：[1]哈尔滨工业大学物理系,黑龙江哈尔滨150001

出　　处：《红外与激光工程》2011年第10期1886-1889,共4页Infrared and Laser Engineering

摘　　要：采用溶胶-凝胶(Sol-gel)法制备了Li+/Er3+/Yb3+三掺ZrO2纳米晶粉末。对纳米晶粉末样品进行了XRD检测,表明Li+掺入并没有改变晶体结构。在室温下用980nm激光研究了烧结温度为800℃样品的上转换发光特性,掺入Li+后纳米晶粉末样品红绿光波段的荧光强度都有很好的增强。通过对激发功率与荧光强度的关系进行研究,发现功率在40～3 535 mW区域内,绿光都来源于双光子过程。红光在低激发功率下主要来自双光子过程,在高激发功率下来源于能量转移过程和双光子过程的共同作用,且能量转移占主导。Erbium and ytterbium co-doped ZrO2 nanocrystalline powders with Li^＋ ions were synthesized by the sol-gel method. It was found that the structure of the samples with Li^＋ ions was the same as that of samples without Li^＋ ions by XRD spectra. Up-conversion photoluminescence spectra of the different sintering temperature＇ s samples were studied with 980 nm diode laser at room temperature. The luminescence intensity of single green and red band was greatly enhanced by doping different Li~ ions concentration. The dependence of the fluorescence intensity with excitation power shows that the green light comes from the two-photon process under the excitation power from 40 mW to 3 535 mW. While the red light mainly derives from the two-photon process under the low excitation power, and the collective contribution of the energy transfer process and two-photon process under high excitation power. Furthermore, the energy transfer process plays the dominant role at high excitation power for the red light.

关 键 词：上转换发光 LI^+ 稀土离子 ZRO2 ER^3+/YB^3+ 

分 类 号：O432.1[机械工程—光学工程]