期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 28, 页码 16289-16303出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b04180
关键词
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资金
- Natural Science Foundation of China [51304086, 11464017]
- Foundation of Science and Technology Pillar Program in Industrial Field of Jiangxi Province [20123BBE50075]
- Natural Science Funds for Distinguished Young Scholar of Jiangxi Province [20171BCB23064]
- Science & Technology Major Project of Jiangxi Province [20165ABC28010]
- Jiangxi University of Science and Technology
Upconversion (UC) luminescence materials doped with rare earth ions are extensively investigated as optical temperature probes by the fluorescence intensity ratio technique. However, most Er3+-doped materials are still suffering from low sensing sensitivity. In the present study, we attempt to develop high-sensing sensitivity Er3+-doped materials based on the thermally coupled energy levels (TCLs) from Stark sublevels as well as the properties at subzero temperatures, for which there is continuous lack of research. Er3+/Yb3+ codoped Ba3Y4O9 (BYO) phosphors were produced via a solid-state reaction. Excited by 980 nm, various output colors, including bright green, yellow, and red, in BYO:Er3+/Yb3+ phosphors as well as the relative emission intensities could be regulated through altering Yb3+ concentrations. Subsequently, on the basis of all 12 pairs of TCLs especially from Stark sublevels of H-2(11/2),S-4(3/2), and F-4(9/2) of Er3+ ions, multiple temperature-sensing performances are evaluated over a wide range of 73-573 K. The results show that the maximum sensitivity of the H-2(11/2) and S-4(3/2(1)) levels is approximately 1-fold higher than that of traditional TCLs of H-2(11/2)/S-4(3/2) at elevated temperature and the maximum sensitivity based on the H-2(11/2(2)) and H-2(11/2(2)) levels is more than 12 times higher than that of the traditional TCLs of H-2(11/2) /S-4(3/2) at subzero temperature. Therefore, it is expected to realize high-sensitivity temperature detection from subzero to elevated temperatures by combining two pairs of different TCLs. In addition, the potential of Er3+/Yb3+ codoped BYO phosphors to be used as an optical heater is studied. The generated temperature can be accurately monitored by BYO:Er3+/Yb3+ phosphors and regulated by adjusting the excitation power, which indicate that BYO:Er3+/Yb3+ phosphors can be used as an optical heating device.
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