稀土学报(英文版)
稀土學報(英文版)
희토학보(영문판)
Journal of Rare Earths
2015年
10期
1026-1030
,共5页
林林%林慧%王哲哲%郑标%谌基兴%徐森元%冯卓宏%郑志强
林林%林慧%王哲哲%鄭標%諶基興%徐森元%馮卓宏%鄭誌彊
림림%림혜%왕철철%정표%심기흥%서삼원%풍탁굉%정지강
luminescence%CaFCl:Tb3+%alkali metal ions%charge compensator%rare earths
A series of CaFCl:Tb3+ and CaFCl:Tb3+,A+ (A=Li, Na and K) nanophosphors were synthesized by the one-step sol-gel method, which were reported for the first time. The sample consisted of monodisperse particles, the average size of which was 37 nm. The emissions of Tb3+ ions and oxygen defects OF? were demonstrated in the CaFCl:Tb3+ samples. The former was made up of sev-eral peaks at 488, 545, 587 and 623 nm, ascribed to5D4→7FJ (J=6–3) transitions of Tb3+ ions. The latter was shown as a broad band peaked at about 450 nm. Alkali metal ions A+(A=Li, Na and K) were introduced asthe charge compensators to improve the lumines-cence of samples. The influence of charge compensators on the emissions of Tb3+ ions and oxygen defects OF? was investigated by the measurement of fluorescence spectra and luminescence decay curves. The results indicated that all the charge compensators weakened the defects emission. Furthermore, Li+ ion was the best charge compensator, because it not only reduced the defects emis-sion but also increased the emission intensity of Tb3+ significantly. Our results suggested that this nanophosphor sensitized by the charge compensator might broaden potential applications of rare-earth doped CaFCl.