Color-tunable upconversion luminescence and temperature sensing behavior of Tm3+/Yb3+ codoped Y2Ti2O7 phosphors
| Autor: | Xubin Tu, Tian Xie, Jinsheng Xu, Mengchao Li, Shiqing Xu, Ruoshan Lei, Huanping Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Temperature sensing business.industry Mechanical Engineering Upconversion luminescence Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Emission intensity Photon upconversion 0104 chemical sciences Mechanics of Materials Optoelectronics General Materials Science 0210 nano-technology business Luminescence Excitation Power density |
| Zdroj: | Materials Research Bulletin. 112:77-83 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2018.12.008 |
| Popis: | Tm3+/Yb3+: Y2Ti2O7 phosphors with color-tunable upconversion (UC) luminescence and optical thermometric property were synthesized and characterized. The phosphors exhibit intense blue and red UC emission bands under 980 nm excitation. The blue to red emission intensity ratio shows an enhancement with increasing excitation power. Hence, the UC color can be tuned from almost white to blue by control of the excitation power density. The temperature sensing behaviors are studied based on fluorescence intensity ratio (FIR) technique at different excitation powers. FIR-1 from the thermally coupled levels (1G4(a) and 1G4(b)) is insensitive to the excitation power, which can obtain consistent measurement results at different excitation powers. Meanwhile, the utilization of FIR-2 from non-thermally coupled levels (3F2,3 and 1G4(b)) can achieve higher sensing sensitivities with the maximal value of ∼0.81%K−1 at 398 K. Hence, Tm3+/Yb3+:Y2Ti2O7 phosphor has promising application prospects in the fields of upconverter, optical thermometer and color tunable device. |
| Databáze: | OpenAIRE |
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