摘要
通过熔融淬冷及热处理方法制备出Yb^3＋/Tm^3＋、Yb^3＋/Ho^3＋共掺杂和Yb^3＋/Tm^3＋/Ho^3＋共掺杂ZnO微晶玻璃,利用X射线衍射和透射电子显微镜表征了ZnO微晶在玻璃基质中析出。在980 nm激发下,该玻璃体系中可以清晰观察到分别源于Tm^3＋：1G4→3H6、Ho^3＋：5S2、5F4→5I8及5F5→5I8辐射跃迁产生的高效蓝光（477 nm）、绿光（545 nm）和红光（660 nm）上转换发光。上转换发射强度与激发功率依赖关系的数据表明,蓝光发射是三光子过程,而绿光和红光发射是双光子过程。通过优化Yb^3＋/Ho^3＋/Tm^3＋共掺杂微晶玻璃中离子掺杂浓度可获得白光发射。980nm激发下2Yb^3＋/0.1Ho^3＋/0.01Tm^3＋共掺杂和2Yb^3＋/0.2Ho^3＋/0.03Tm^3＋共掺杂微晶玻璃上转换发光的CIE坐标分别为（X=0.32, Y=0.34）和（X=0.33, Y=0.32）,非常接近标准白的CIE色坐标（X=0.33, Y=0.33）,表明该材料在白光发射领域具有良好的应用前景。
Yb^3＋/Tm^3＋ co-doped, Yb^3＋/Ho^3＋ co-doped and Yb^3＋/Tm^3＋/Ho^3＋ tri-doped glass-ceramics with ZnO nanocrystals were prepared via melting-quenching and heat treatment. The precipitation of ZnO nanocrystals in the glass-ceramics was determined by X-ray diffraction and transmission electron microscopy. The efficient blue （477 nm）, green （545 nm）, and red （660 nm） upconversion emissions appear under the excitation of 980 nm due to the radiative transitions of Tm^3＋：1G4→^3H6, Ho^3＋：Ss2,^5F4→^5I8, and ^5F5→^5I8, respectively. Based on the measurement of the excitation power dependent upconversion emission intensity, the blue emission is a three-photon process, and the green and red emissions are two-photon process. The white light emitting can be obtained in yb^3＋/Ho^3＋/Tm^3＋ tri-doped glass-ceramics via the optimization of the doping concentrations. The CIE coordinates （X=0.32, Y=0.34） and （X=0.33, Y=0.32） of 2Yb^3＋/0.1Ho^3＋/0.01Tm^3＋ tri-doped and 2Yb^3＋/0.2Ho^3＋/0.03Tm^3＋ tri-doped glass-ceramics are similar to those of the standard white light illuminate （X=0.33, Y=0.33）, indicating a promising application for white light emitting.
作者
刘天华
郭壮
叶松
王德平
LIU Tianhua, GUO Zhuang, YE Song, WANG Deping(School of Materials Science and Engineering, Tongji University, Shanghai 201804, China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2018年第11期1507-1512,共6页
Journal of The Chinese Ceramic Society
基金
上海市自然科学基金项目(18ZR1441900)
国家自然科学基金项目(51772210)
关键词
上转换
白光发射
稀土离子
氧化锌纳米晶
upconversion
white light emitting
rare earth ions
zinc oxide nanocrystals
