The vacuum ultraviolet (VUV) spectroscopic properties of praseodymium (Pr3+, 1at%) doped LaF3 nanocrystals/glass at room temperature and 20 K are reported. Two types of Pr3+ ions, those in LaF3 nanocrystals and those ...The vacuum ultraviolet (VUV) spectroscopic properties of praseodymium (Pr3+, 1at%) doped LaF3 nanocrystals/glass at room temperature and 20 K are reported. Two types of Pr3+ ions, those in LaF3 nanocrystals and those in the glass host, were excited to 4f 5d band by VUV using synchrotron radiation as an excitation source, and emissions of 1S0 → 1D2 (336 nm), 1S0 → 1I6 (397 nm ) of Pr3+ in the nanocrystals and emissions of 4f 5d → 3HJ, 3FJ of Pr3+ in the glass appeared at the same time. But unlike in the bulk sample crystals, emission of 3P0 → 3HJ, 3FJ as the second step of the quantum splitting (QS) of Pr3+ in the LaF3 nanocrystals was not observed at room temperature, which could be explained that Pr3+ ions in the glass absorbed the energy of 3P0 → 3H4 of Pr3+ in the nanocrystals. Two types of excitation spectra monitoring different emissions were also measured, so it could be observed that the lowest energy of 4f 5d band of Pr3+ in the nanocrystals was about 53 500 cm-1 (186 nm) and in the glass about 33 800 cm-1(295 nm), respectively. These emission and excitation spectra were contrasted to those of bulk sample crystals LaF3∶Pr3+.展开更多
TQ171.7//O482.31 2003021442Er<sup>3+</sup>:Yb<sup>3+</sup>共掺杂氟氧混合物玻璃的上转换发光研究=Study of up-conversion fluorescence in Er<sup>3+</sup>:Yb<sup>3+</sup>co-d...TQ171.7//O482.31 2003021442Er<sup>3+</sup>:Yb<sup>3+</sup>共掺杂氟氧混合物玻璃的上转换发光研究=Study of up-conversion fluorescence in Er<sup>3+</sup>:Yb<sup>3+</sup>co-dopedoxyfluoride glass[刊,中]/阳效良（湘潭大学物理系.湖南,湘潭（411105））,刘正威…//光谱学与光谱分析.—2002,22（3）.—357-359制备了化学西文为（50-x）GeO<sub>2</sub>·PbF<sub>2</sub>·WO<sub>3</sub>·（6+x）CdF<sub>2</sub>·1.4Yb<sub>2</sub>O<sub>3</sub>·0.6Er<sub>2</sub>O<sub>3</sub>（x=10,20,30）氟氧混合物玻璃。研究了930nm发光二极管激发下Er<sup>3+</sup>:Yb<sup>3+</sup>共掺杂情形下的Er<sup>3+</sup>离子的上转换发光特性,观测到了Er<sup>3+</sup>离子中心波长位于543、550和655nm处的三个强荧光发射带。通过对样品的反斯托克斯喇曼光谱的测量,确定了基质的最大声子能量,在此基础上分析了上转换荧光的产生机制。利用基质的平均电负性差和平均阳离子场强这两个参数,讨论了基质材料中GeO<sub>2</sub>和CdF<sub>2</sub>展开更多
文摘The vacuum ultraviolet (VUV) spectroscopic properties of praseodymium (Pr3+, 1at%) doped LaF3 nanocrystals/glass at room temperature and 20 K are reported. Two types of Pr3+ ions, those in LaF3 nanocrystals and those in the glass host, were excited to 4f 5d band by VUV using synchrotron radiation as an excitation source, and emissions of 1S0 → 1D2 (336 nm), 1S0 → 1I6 (397 nm ) of Pr3+ in the nanocrystals and emissions of 4f 5d → 3HJ, 3FJ of Pr3+ in the glass appeared at the same time. But unlike in the bulk sample crystals, emission of 3P0 → 3HJ, 3FJ as the second step of the quantum splitting (QS) of Pr3+ in the LaF3 nanocrystals was not observed at room temperature, which could be explained that Pr3+ ions in the glass absorbed the energy of 3P0 → 3H4 of Pr3+ in the nanocrystals. Two types of excitation spectra monitoring different emissions were also measured, so it could be observed that the lowest energy of 4f 5d band of Pr3+ in the nanocrystals was about 53 500 cm-1 (186 nm) and in the glass about 33 800 cm-1(295 nm), respectively. These emission and excitation spectra were contrasted to those of bulk sample crystals LaF3∶Pr3+.
文摘TQ171.7//O482.31 2003021442Er<sup>3+</sup>:Yb<sup>3+</sup>共掺杂氟氧混合物玻璃的上转换发光研究=Study of up-conversion fluorescence in Er<sup>3+</sup>:Yb<sup>3+</sup>co-dopedoxyfluoride glass[刊,中]/阳效良（湘潭大学物理系.湖南,湘潭（411105））,刘正威…//光谱学与光谱分析.—2002,22（3）.—357-359制备了化学西文为（50-x）GeO<sub>2</sub>·PbF<sub>2</sub>·WO<sub>3</sub>·（6+x）CdF<sub>2</sub>·1.4Yb<sub>2</sub>O<sub>3</sub>·0.6Er<sub>2</sub>O<sub>3</sub>（x=10,20,30）氟氧混合物玻璃。研究了930nm发光二极管激发下Er<sup>3+</sup>:Yb<sup>3+</sup>共掺杂情形下的Er<sup>3+</sup>离子的上转换发光特性,观测到了Er<sup>3+</sup>离子中心波长位于543、550和655nm处的三个强荧光发射带。通过对样品的反斯托克斯喇曼光谱的测量,确定了基质的最大声子能量,在此基础上分析了上转换荧光的产生机制。利用基质的平均电负性差和平均阳离子场强这两个参数,讨论了基质材料中GeO<sub>2</sub>和CdF<sub>2</sub>
