Laser-induced SnO 2 crystallization and fluorescence properties in Eu 3 + -doped SnO 2 − SiO 2 glasses
Laser-induced SnO 2 crystallization and fluorescence properties in Eu 3 + -doped SnO 2 − SiO 2 glasses
复制标题
Eu 3 + 掺杂 SnO 2 − SiO 2 玻璃中激光诱导 SnO 2 结晶和荧光特性
DOI：
10.1103/physrevb.68.104204
复制
发表时间：
2003
影响因子：
3.7
通讯作者：
Hongpeng You
中科院分区：
文献类型：
--
作者：
M. Nogami;Atsusi Ohno;Hongpeng You
${\mathrm{SnO}}_{2}$ nanoparticles having an average particle size of 5 nm were precipitated in transparent glasses by irradiation with an 800-nm femtosecond laser pulse. Glasses, prepared to codope ${\mathrm{Sn}}^{4+}$ and ${\mathrm{Eu}}^{3+}$ ions by a sol-gel method, were heated in a ${\mathrm{H}}_{2}$ gas atmosphere, in which the Sn ions are coordinated by two oxygen ions with point defect of a molecularlike electronic structure. Upon laser pulse irradiation, the twofold-coordinated Sn atoms are activated to react with oxygen, resulting in the formation of ${\mathrm{SnO}}_{2}$ nanocrystals. The precipitated ${\mathrm{SnO}}_{2}$ crystals grew up to circa 5-nm size by the Joule-heating effect of the laser. The fluorescence intensities of the codoped ${\mathrm{Eu}}^{3+}$ ions were enhanced higher than 100 times that of the glass without nanocrystals by exciting with an energy corresponding to the absorption edge of the ${\mathrm{SnO}}_{2}$ nanocrystals, the energy of which is effectively transferred to the ${\mathrm{Eu}}^{3+}$ ions. It was found that the ${\mathrm{Eu}}^{3+}$ ions are located in the glass structure from the fluorescence line narrowing spectroscopy.
${\mathrm{SnO}}_{2}$ nanoparticles having an average particle size of 5 nm were precipitated in transparent glasses by irradiation with an 800-nm femtosecond laser pulse. Glasses, prepared to codope ${\mathrm{Sn}}^{4+}$ and ${\mathrm{Eu}}^{3+}$ ions by a sol-gel method, were heated in a ${\mathrm{H}}_{2}$ gas atmosphere, in which the Sn ions are coordinated by two oxygen ions with point defect of a molecularlike electronic structure. Upon laser pulse irradiation, the twofold-coordinated Sn atoms are activated to react with oxygen, resulting in the formation of ${\mathrm{SnO}}_{2}$ nanocrystals. The precipitated ${\mathrm{SnO}}_{2}$ crystals grew up to circa 5-nm size by the Joule-heating effect of the laser. The fluorescence intensities of the codoped ${\mathrm{Eu}}^{3+}$ ions were enhanced higher than 100 times that of the glass without nanocrystals by exciting with an energy corresponding to the absorption edge of the ${\mathrm{SnO}}_{2}$ nanocrystals, the energy of which is effectively transferred to the ${\mathrm{Eu}}^{3+}$ ions. It was found that the ${\mathrm{Eu}}^{3+}$ ions are located in the glass structure from the fluorescence line narrowing spectroscopy.