Shape controllable synthesis and enhanced upconversion photoluminescence ofβ-NaGdF4:Yb^3+,Er^3+nanocrystals by introducing Mg(^2+)  

作　　者：杨永馨 徐征 赵谡玲 梁志琴 朱薇 张俊杰 

机构地区：[1]Key Laboratory of Luminescence and Optical Information,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China [2]Institute of Optoelectronics Technology,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Chinese Physics B》2017年第8期474-480,共7页中国物理B（英文版）

基　　金：supported by the National High Technology Research and Development Program of China(Grant No.2013AA032205);the Key Project of Beijing Scientific Committee,China(Grant No.D161100003416001);the Fundamental Research Funds for the Central Universities,China(Grant No.2016JBM066);the National Natural Science Foundation of China(Grant Nos.51272022 and 11474018)

摘　　要：Different concentrations of Mg^（2＋） -doped hexagonal phase NaGdF_4：Yb^（3＋）, Er^（3＋）nanocrystals（NCs） were synthesized by a modified solvothermal method. Successful codoping of Mg^（2＋）ions in upconversion nanoparticles（UCNPs） was supported by XRD, SEM, EDS, and PL analyses. The effects of Mg^（2＋）doping on the morphology and the intensity of the upconversion（UC） emission were discussed in detail. It turned out that with the concentration of Mg^（2＋）increasing, the morphology of the nanoparticles turn to change gradually and the UC emission was increasing gradually as well. Notably the UC fluorescence intensities of Er^（3＋）were gradually improved owing to the codoped Mg^（2＋）and then achieved a maximum level as the concentration of Mg^（2＋）ions was 60 mol% from the amendment of the crystal structure of β-NaGdF_4：Yb^（3＋）,Er^（3＋）nanoparticles. Moreover, the UC luminescence properties of the rare-earth（Yb3＋, Er^（3＋）） ions codoped NaGdF_4 nanocrystals were investigated in detail under 980-nm excitation.Different concentrations of Mg^（2＋） -doped hexagonal phase NaGdF_4：Yb^（3＋）, Er^（3＋）nanocrystals（NCs） were synthesized by a modified solvothermal method. Successful codoping of Mg^（2＋）ions in upconversion nanoparticles（UCNPs） was supported by XRD, SEM, EDS, and PL analyses. The effects of Mg^（2＋）doping on the morphology and the intensity of the upconversion（UC） emission were discussed in detail. It turned out that with the concentration of Mg^（2＋）increasing, the morphology of the nanoparticles turn to change gradually and the UC emission was increasing gradually as well. Notably the UC fluorescence intensities of Er^（3＋）were gradually improved owing to the codoped Mg^（2＋）and then achieved a maximum level as the concentration of Mg^（2＋）ions was 60 mol% from the amendment of the crystal structure of β-NaGdF_4：Yb^（3＋）,Er^（3＋）nanoparticles. Moreover, the UC luminescence properties of the rare-earth（Yb3＋, Er^（3＋）） ions codoped NaGdF_4 nanocrystals were investigated in detail under 980-nm excitation.

关 键 词：NaGdF4：Yb3＋/Er3＋ nanoparticles Mg2＋ions morphology upconversion photoluminescence 

分 类 号：O482.31[理学—固体物理]