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.
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)