文献类型：期刊文献

英文题名：The effect of micro-structure on upconversion luminescence of Nd3+/Yb3+ co-doped La2O3-TiO2-ZrO2 glass-ceramics

作者：Zhang, Minghui[1];Wen, Haiqin[1];Pan, Xiuhong[1];Yu, Jianding[1];Jiang, Meng[2];Yu, Huimei[3];Tang, Meibo[1];Gai, Lijun[1];Ai, Fei[1]

机构：[1]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China;[2]Shanghai Univ Med & Hlth Sci, Sch Art & Sci, Shanghai 201318, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：5

期号：3

外文期刊名：MATERIALS RESEARCH EXPRESS

收录：;EI(收录号：20191306681423);WOS:【SCI-EXPANDED(收录号:WOS:000427579000001)】；

基金：This work was supported by National Nature Science Foundation of China (No. 51602330, No. 51472263), Visiting Scholarship Fund of Chinese Academy of Sciences (2016113), Shanghai Sailing Program (16YF1413100), and National Key Research Program of China (2016YFF0101705).

语种：英文

外文关键词：containerless processing; micro-structure; heat treatment; upconversion luminescence

摘要：Nd3+/Yb3+ co-doped La2O3-TiO2-ZrO2 glasses have been prepared by aerodynamic levitation method. The glasses show high refractive index of 2.28 and Abbe number of 18.3. Glass-ceramics heated at 880 degrees Cfor 50 min perform the strongest upconversion luminescence. X-ray diffraction patterns of glass-ceramics with different depths indicate that rare earth ions restrain crystallization. Body crystallization mechanism mixed with surface crystallization is confirmed in the heat treatment. Surface crystals achieve priority to grow, resulting in important effects on upconversion luminescence. The results of atomic force microscope and scanning electron microscope indicate that crystal particles with uniform size distribute densely and homogenously on the surface and large amount of glass matrix exists in the glass ceramics heated at 880 degrees C for 50 min. Crystals in the glass-ceramics present dense structure and strong boundaries, which can reduce the mutual nonradiative relaxation rate among rare earth ions and then improve upconversion luminescence effectively. Based on microstructural study, the mechanism that upconversion luminescence can be improved by heat treatment has been revealed. The results of micro-structural analysis agree well with the spectra.