Effect of Yb3+ concentration on upconversion luminescence in Yb3+, Tm3+ co-doped Lu2O3 nanophosphors
Effect of Yb3+ concentration on upconversion luminescence in Yb3+, Tm3+ co-doped Lu2O3 nanophosphors
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DOI：
10.1016/j.jallcom.2013.10.122
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发表时间：
2014-02
影响因子：
6.2
通讯作者：
Li Li-Li;Huihui Lin;Xiaoqi Zhao;Yongjie Wang;Xianju Zhou;Chonggeng Ma;Xiantao Wei
中科院分区：
文献类型：
--
作者：
Li Li-Li;Huihui Lin;Xiaoqi Zhao;Yongjie Wang;Xianju Zhou;Chonggeng Ma;Xiantao Wei
以碳酸氢铵为沉淀剂，采用类反相共沉淀法成功合成了Yb 3+和Tm 3+共掺杂的氧化镥纳米荧光粉。研究了Yb 3+掺杂浓度对Lu 2 O3纳米荧光粉结构和上转换发光性能的影响。XRD结果表明，所制备的纳米荧光粉均为纯立方相Lu 2 O3，且具有良好的结晶性。实验结果表明，当Tm ~（3+）浓度为0.2mol%时，Yb ~（3+）的最佳掺杂浓度为4mol%。在980 nm激光激发下，观察到了强蓝光、弱红光和近红外发射，分别归属于Tm 3+离子的1G 4 → 3 H6、1G 4 → 3F 4和3 H4 → 3 H6跃迁。在强功率密度（50 W/cm ~ 2）激发下，上转换蓝光强度比（477 nm/490 nm）与Yb ~（3+）浓度有关，这是由激光诱导的热效应引起的。并对上转换机理进行了详细的讨论。
Lutetium oxide nanophosphors codoped with Yb3+and Tm3+ions were successfully synthesized by the reverse-like co-precipitation method, using ammonium hydrogen carbonate as precipitants. Effect of the Yb3+molar concentration on the structural and upconversion luminescent properties of the Lu2O3nanophosphors has been investigated. The XRD results show that all the prepared nanophosphors can be readily indexed to pure cubic phase of Lu2O3and exhibit good crystallinity. The experimental results show that the optimum Yb3+doped concentration is 4 mol% at fixed Tm3+concentration of 0.2 mol%. The strong blue, weak red and near infrared emissions from the prepared nanophosphors were observed under 980 nm laser excitation, which are attributed to the1G4→3H6,1G4→3F4and3H4→3H6transitions of Tm3+ion, respectively. Under strong power density (50 W/cm2) excitation, the upconversion blue intensity ratio (477 nm/490 nm) was dependent on the Yb3+concentration, which was resulted from the thermal effect induced by laser irradiation. The upconversion mechanism was also discussed in detail.