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Coprecipitation synthesis of α-(La,Yb,Er)2 W2 O9 tungstate as a novel upconversion phosphor for optical thermometry.
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- Author(s): Xuejiao Wang; Xiaowen Feng; Changshuai Gong; Meng Sun; Chuang Wang; Qiushi Wang; Ji-Guang Li
- Source:
Journal of Asian Ceramic Societies; Dec2021, Vol. 9 Issue 4, p1419-1428, 10p- Subject Terms:
- Source:
- Additional Information
- Abstract: Phase-pure α-(La,Yb,Er)
2 W2 O9 upconversion (UC) phosphors were synthesized via room temperature coprecipitation and subsequent calcination at 1073-1273 K. The pH of the coprecipitation system and the RE3+ to WO4 2- ratio were found crucial for the formation of the target α phase. Phase transformation from cubic β-(La,Yb,Er)2 W2 O9 to triclinic α-(La,Yb,Er)2 W2 O9 occurred when calcination temperature was above 873 K. The UC luminescence including power/temperature dependent emission, decay kinetics of the main emission, emission color, and underlying UC mechanism were systematically investigated. The phosphor exhibited bright green luminescence under 978 nm laser excitation. The main emission (4S3/2 →4I15/2 ) was analyzed to decay in a single exponential manner and have a decay time of 153.86 μs at room temperature. A three-photon mechanism was suggested responsible for the observed UC luminescence through analyzing the UC intensity against excitation power via logarithmic data transformation. The performance of optical temperature sensing was evaluated and compared with other typical UC phosphors. It was shown that the phosphor has relatively high maximum SA and SR values of 0.02694 K-1 (548 K) and 0.01699 K-1 (298 K) for the thermally coupled 2H11/2 and 4S3/2 energy levels in the 298-548 K temperature range. [ABSTRACT FROM AUTHOR] - Abstract: Copyright of Journal of Asian Ceramic Societies is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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