Upconversion Luminescence of ZnO-TiO2: Ho3+/Yb3+ Phosphor Powder
Upconversion Luminescence of ZnO-TiO2: Ho3+/Yb3+ Phosphor Powder
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DOI：
10.4028/www.scientific.net/msf.922.32
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
K. Kobwittaya;Y. Oishi;T. Torikai;M. Yada;T. Watari
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
采用粉末-溶液混合法合成了Ho 3 +/Yb 3+共掺杂ZnO-TiO 2复合体系，研究了其在980 nm激光激发下的上转换发光特性。还研究了不同ZnO/TiO 2混合比以及Ho 3+和Yb 3+浓度的影响。XRD图谱显示在1300 °C下烧制的产物由Zn 2 TiO 4、TiO 2、RE 2 Ti 2 O 7和RE 2 TiO 5（RE = Ho 3+和/或Yb 3+）相组成。在538 nm处检测到最强的绿色发射，与Ho 3+离子的5 F4，5S 2 → 5I 8跃迁相一致。通过改变ZnO/TiO 2混合比以及Ho 3+和Yb 3+的浓度，改变产物的发射强度。掺杂0.03mol%Ho ~（3+），9mol%Yb ~（3+）的1 ZnO：1 TiO_2（摩尔比）样品在1300 ℃下焙烧1h后，观察到了明亮的UC发光。此外，UC发射强度对激发功率的依赖性表明，双光子过程是负责该UC系统。
Ho3+/Yb3+ co-doped ZnO-TiO2 composite system were synthesized by powder-solution mixing method and their upconversion (UC) luminescence characteristics were investigated under the 980 nm laser excitation. The effect of various ZnO/TiO2 mixing ratios, and Ho3+ and Yb3+ concentrations were also studied. The XRD patterns showed that the product fired at 1300 °C consisted of Zn2TiO4, TiO2, RE2Ti2O7, and RE2TiO5 (RE = Ho3+ and/or Yb3+) phases. The green emission centered at 538 nm wavelength was detected as the strongest emission intensity which it was in accordance with the 5F4,5S2 → 5I8 transition of Ho3+ ion. The emission intensity of the product changed by varying ZnO/TiO2 mixing ratios, and Ho3+ and Yb3+ concentrations. Brightest UC emission was observed in the sample of 1ZnO:1TiO2 (in mole) doped with 0.03 mol% Ho3+, 9 mol% Yb3+ fired at 1300 °C for 1 h. Besides, the dependence of the UC emission intensity on the excitation power indicated that the two-photon process was responsible for this UC system.