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Yb3+-Concentration dependent upconversion luminescence and temperature sensing behavior in Yb3+/Er3+ codoped Gd2MoO6 nanocrystals prepared by a facile citric-assisted sol–gel method
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-09-26 00:00:00 , DOI: 10.1039/c7qi00497d Peng Du 1, 2, 3, 4 , Xiaoyong Huang 5, 6, 7, 8, 9 , Jae Su Yu 1, 2, 3, 4
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-09-26 00:00:00 , DOI: 10.1039/c7qi00497d Peng Du 1, 2, 3, 4 , Xiaoyong Huang 5, 6, 7, 8, 9 , Jae Su Yu 1, 2, 3, 4
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Yb3+/Er3+ codoped Gd2MoO6 upconversion nanocrystals were synthesized via the traditional citric-assisted sol–gel method. X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy and upconversion emission spectroscopy were employed to characterize the final products. Under the irradiation of 980 nm light, the synthesized nanocrystals emitted visible green and red upconversion emissions arising from the intra-4f transitions of Er3+ ions. The upconversion emission intensities were found to be dependent on the dopant concentration and the emission colour gradually changed from green to yellow, and finally to red on elevating the Yb3+ doping concentration. The involved upconversion luminescence mechanism was systematically studied and the steady-state rate expressions were applied to analyze the influence of energy back transfer on the multicolour upconversion emissions. Moreover, the temperature dependent emission intensity ratio of the (2H11/2, 4S3/2) thermally coupled levels of the Er3+ ion in the range of 303–703 K was recorded to study the optical thermometric properties of the resultant nanocrystals. The maximum sensor sensitivity of the Yb3+/Er3+ codoped Gd2MoO6 nanocrystals was determined to be as high as 0.0053 K−1 at 350 K. In addition, the temperature sensing performance of the synthesized compounds was found to be greatly dependent on the Yb3+ doping concentration. These results reveal that the Yb3+/Er3+ codoped Gd2MoO6 nanocrystals with high sensor sensitivity and wide operation range are suitable for non-contact optical thermometry.
中文翻译：
Yb 3+-柠檬酸辅助溶胶-凝胶法制备的Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6纳米晶体中 浓度依赖的上转换发光和温度感应行为
通过传统的柠檬酸辅助溶胶-凝胶法合成了Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6上转换纳米晶体。利用X射线衍射，场发射扫描电子显微镜，透射电子显微镜和上转换发射光谱来表征最终产物。在980 nm的光照射下，合成的纳米晶体发出了可见的绿色和红色上转换发射光，该发射是由Er 3+离子的内部4f跃迁引起的。发现上转换发射强度取决于掺杂剂浓度，并且随着Yb 3+的升高，发射颜色逐渐从绿色变为黄色，最终变为红色。掺杂浓度。系统地研究了所涉及的上转换发光机理，并采用稳态速率表达式来分析能量回传对多色上转换发射的影响。此外，记录了Er 3+离子的（2 H 11 / 2，4 S 3/2）热耦合能级的温度依赖性发射强度比，以研究303-703 K范围内的光学热学性质。产生的纳米晶体。Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6纳米晶体的最大传感器灵敏度被确定为高达0.0053 K在350 K时为-1。此外，发现合成化合物的温度感测性能很大程度上取决于Yb 3+的掺杂浓度。这些结果表明，Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6纳米晶体具有较高的传感器灵敏度和较宽的操作范围，适用于非接触式光学测温。
更新日期：2017-09-26
中文翻译：
Yb 3+-柠檬酸辅助溶胶-凝胶法制备的Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6纳米晶体中 浓度依赖的上转换发光和温度感应行为
通过传统的柠檬酸辅助溶胶-凝胶法合成了Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6上转换纳米晶体。利用X射线衍射，场发射扫描电子显微镜，透射电子显微镜和上转换发射光谱来表征最终产物。在980 nm的光照射下，合成的纳米晶体发出了可见的绿色和红色上转换发射光，该发射是由Er 3+离子的内部4f跃迁引起的。发现上转换发射强度取决于掺杂剂浓度，并且随着Yb 3+的升高，发射颜色逐渐从绿色变为黄色，最终变为红色。掺杂浓度。系统地研究了所涉及的上转换发光机理，并采用稳态速率表达式来分析能量回传对多色上转换发射的影响。此外，记录了Er 3+离子的（2 H 11 / 2，4 S 3/2）热耦合能级的温度依赖性发射强度比，以研究303-703 K范围内的光学热学性质。产生的纳米晶体。Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6纳米晶体的最大传感器灵敏度被确定为高达0.0053 K在350 K时为-1。此外，发现合成化合物的温度感测性能很大程度上取决于Yb 3+的掺杂浓度。这些结果表明，Yb 3+ / Er 3+共掺杂的Gd 2 MoO 6纳米晶体具有较高的传感器灵敏度和较宽的操作范围，适用于非接触式光学测温。
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