Optical and magnetic properties of (Er, F) co-doped SnO2 nanocrystals
Optical and magnetic properties of (Er, F) co-doped SnO2 nanocrystals
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(Er,F)共掺杂SnO2纳米晶的光磁性能
DOI：
10.3906/fiz-1405-4
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发表时间：
2014
影响因子：
2.1
通讯作者：
R. Nagarajan
中科院分区：
文献类型：
--
作者：
Vinod Kumar;S. Uma;R. Nagarajan
通过基于低温溶液的方法获得的均匀（Er、F）共掺杂 SnO2 纳米晶体，并通过多种分析技术进行了表征。分别通过 PXRD、SEM 和 TEM 分析确认了元素的结构、形貌和比例。根据 XPS 分析，对 Sn、O 和 F 的原子浓度进行了定量。共掺杂样品的颗粒间孔径显着增加（平均孔径为 25.82 nm）。在样品的拉曼光谱中观察到由于多声子散射导致的更高的面内氧空位和谱带。使用 TL 光谱法通过实验确定样品中的缺陷陷阱。 TL 光谱中 485 K 处的宽强辉光曲线和 600 K 处的弱发射在暴露于紫外线辐射时被淬灭。对于 (Er, F) 共掺杂 SnO2，观察到激子吸收的大蓝移（由于 Moss{Burstein 效应）和由于内配置 al f f 跃迁而产生的锐带，估计带隙为 4.18 eV。通过光致发光光谱研究，检测到 471 nm、546 nm 和 627 nm 处的 3 种发射中心。室温下共掺杂稳定了 SnO2 中的铁磁性。
Uniformly (Er, F) co-doped SnO2 nanocrystals, obtained by a low-temperature solution-based method, were characterized by a variety of analytical techniques. The structure, morphology, and ratio of the elements were conrmed by PXRD, SEM, and TEM analysis, respectively. From XPS analysis, atomic concentrations of Sn, O, and F were quantied. Interparticle pore size increased signicantly (with a mean pore diameter of 25.82 nm) in the co- doped sample. Higher in-plane oxygen vacancies and bands due to multiphonon scattering were observed in the Raman spectrum of the sample. The defect traps in the sample were experimentally determined using TL spectroscopy. A broad intense glow curve at 485 K and a weak emission at 600 K in the TL spectrum were quenched on exposure to UV radiation. A large blue shift of the exciton absorption (due to the Moss{Burstein eect) and sharp bands due to intraconguration al f f transitions were observed for (Er, F) co-doped SnO2 with an estimated band gap of 4.18 eV. From the photoluminescence spectral studies, 3 types of emission centers at 471 nm, 546 nm, and 627 nm were detected. Co-doping stabilized ferromagnetism in SnO2 at room temperature.