Bright red upconversion luminescence from Er3+ and Yb3+ co-doped ZnO-TiO2 composite phosphor powder
Bright red upconversion luminescence from Er3+ and Yb3+ co-doped ZnO-TiO2 composite phosphor powder
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DOI：
10.1016/j.ceramint.2017.07.056
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发表时间：
2017-11
影响因子：
5.2
通讯作者：
K. Kobwittaya;Y. Oishi;T. Torikai;M. Yada;T. Watari;H. Luitel
中科院分区：
文献类型：
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作者：
K. Kobwittaya;Y. Oishi;T. Torikai;M. Yada;T. Watari;H. Luitel
采用粉末-溶液混合法成功制备了Er 3+和Yb 3+共掺杂的ZnO-TiO 2复合材料，并对其上转换发光进行了研究。研究了烧成温度、ZnO/TiO 2混合比和掺杂浓度范围对样品结构和UC发光性能的影响。利用X射线衍射（XRD）对产物的晶体结构进行了详细的研究和计算。此外，在基质材料中的Er 3+和Yb 3+离子的位置优先考虑和分析的基础上的XRD结果和UC发光特性。在1300 °C烧成的ZnO-TiO 2：Er 3+，Yb 3+磷光体中观察到了闪烁的UC发光，其中该体系由混合相组成：Zn 2 TiO 4，TiO 2，RE 2 TiO 7和RE 2 TiO 5（RE = Er 3+和/或Yb 3+）。在980 nm激光激发下，在UC发射光谱中检测到两个发射带，分别为中心位于544和559 nm的弱绿色带和中心位于657和675 nm的强红色带，分别对应于Er 3+离子的2 H 11/2，4 S 3/2→ 4 I 15/2和4 F 9/2→ 4 I 15/2跃迁。通过对Zn 2 TiO 4晶体结构、晶体性质以及Er 3+、Yb 3+离子对基质晶体的影响的分析，得到了解释Er 3+、Yb 3+离子在基质晶体中择优位置的简单化学方程。通过改变ZnO/TiO 2混合比、Er 3+和Yb 3+浓度，改变了产物的UC发射强度。发射最亮UC发射的最佳合适条件是掺杂3mol%Er3+、9mol%Yb3+的1 ZnO：1 TiO 2在1300 °C下烧制1h。
ZnO-TiO2composites co-doped with Er3+and Yb3+ions were successfully synthesized by powder-solution mixing method and their upconversion (UC) luminescence was evaluated. The effect of firing temperature, ZnO/TiO2mixing ratio, and dopant concentration ranges on structural and UC luminescence properties was investigated. The crystal structure of the product was studied and calculated in detail by means of X-ray diffraction (XRD). Also, the site preference of Er3+and Yb3+ions in the host material was considered and analyzed based on XRD results and UC luminescence characteristics. Brightest UC luminescence was observed in the ZnO-TiO2:Er3+,Yb3+phosphor fired at 1300 °C in which the system consisted of mixed phases; Zn2TiO4, TiO2, RE2Ti2O7and RE2TiO5(RE = Er3+and/or Yb3+). Under the excitation of a 980 nm laser, the two emission bands were detected in the UC emission spectrum, weak green band centered at 544 and 559 nm, and strong red band centered at 657 and 675 nm wavelengths in accordance with2H11/2,4S3/2→4I15/2and4F9/2→4I15/2transitions of Er3+ion, respectively. The simple chemical formula equations, for explaining the site preference of Er3+and Yb3+ions in host crystal matrix, were generated by considering the Zn2TiO4crystal structure, its crystal properties, and the effect of Er3+and Yb3+ions to the host crystal matrix. The UC emission intensity of the products was changed by varying ZnO/TiO2mixing ratios, and Er3+and Yb3+concentrations. The best suitable condition for emitting the brightest UC emission was 1ZnO:1TiO2doped with 3 mol% Er3+, 9 mol% Yb3+fired at 1300 °C for 1 h.