High sensitive ratiometric optical thermometer based on different multi-photon processes of upconversion luminescence in scheelite Ca1-xMgxWO4:Er3+/Yb3+ phosphors.
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| Title: | High sensitive ratiometric optical thermometer based on different multi-photon processes of upconversion luminescence in scheelite Ca1-xMgxWO4:Er3+/Yb3+ phosphors. |
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| Authors: | Liu, Xinyue1 (AUTHOR), Sun, Chengmei1 (AUTHOR), Xu, Chengcheng1 (AUTHOR), Wang, Qingru1 (AUTHOR), Wang, Kai1 (AUTHOR), Zhang, Dong1 (AUTHOR) zhangdong@lcu.edu.cn |
| Source: | Ceramics International. Nov2024:Part B, Vol. 50 Issue 21, p43255-43263. 9p. |
| Subjects: | Photon upconversion, Multiphoton processes, Electron paramagnetic resonance, Light sources, Luminescence |
| Abstract: | The relative fluorescence intensity from different multi-photon processes is affected by the excitation light source fluctuation, which reduces the anti-interference and sensitivity of thermometers based on fluorescence intensity ratio (FIR) in upconversion (UC) luminescence. Ca 1-x Mg x WO 4 : Yb3+, Er3+ phosphors with scheelite structure were synthesized to investigate their anti-interference and higher temperature sensitivity. With x increasing from 0 to 1, the Bragg angle shifted toward higher angle, indicating that the larger disorders were introduced into the phosphors. The emissions assigned to Er3+ were enhanced with Mg2+ concentration increasing, attributed to oxygen vacancies according to the results of electron paramagnetic resonance. The photon numbers of upconversion luminescence assigned to 2H 11/2 → 4I 15/2 , 4S 3/2 → 4I 15/2 and 4F 9/2 → 4I 15/2 transitions of Er3+ were three- and two-photon processes, respectively. The ratio between the cube of 4S 3/2 and the square of 2H 11/2 emissions revealed higher temperature sensing performance and anti-interference on the excitation source power than the that between 4S 3/2 and 2H 11/2. The maximum relative sensitivity was 0.66 % K−1 at 300 K based on the common optical ratiometric thermometry. The maximum relative sensitivity based on the emissions assigned to different multi-photon processes was 7.2 % K−1 at 573 K. The dopants of Mg2+ composited of oxygen vacancies in CaWO 4 crystals improved the luminous intensity and temperature sensing performance. This suggested the potential application of optical ratiometric thermometers based on different multi-photons of UC luminescence in temperature sensing field. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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