Effect of Li + ion concentration on upconversion emission and temperature sensing behavior of La 2 O 3 :Er 3+ phosphors
| Autor: | Guangrun Chen, Ruoshan Lei, Yin Tian, Shilong Zhao, Huanping Wang, Shiqing Xu, Feifei Huang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Quenching (fluorescence)
Materials science Scanning electron microscope Analytical chemistry Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Emission intensity Photon upconversion 0104 chemical sciences Ion Crystal Lattice constant Geochemistry and Petrology 0210 nano-technology |
| Zdroj: | Journal of Rare Earths. 36:119-124 |
| ISSN: | 1002-0721 |
| DOI: | 10.1016/j.jre.2017.03.004 |
| Popis: | The effects of Li+ co-doping concentration on the structure, upconversion luminescence and temperature sensing behavior of Er3+:La2O3 phosphors were investigated. X-ray diffraction and scanning electron microscopy observations reveal that Li+ ion co-doping can change the lattice parameter of La2O3 host and increase the particle size of the samples. The optical investigation shows that co-doping of Li+ ions can enhance the upconversion emission of Er3+ ions in La2O3 matrix effectively. Most importantly, the temperature sensing sensitivity of the samples is found to be dependent on Li+ co-doping concentration, when the emission intensity ratio of the (2H11/2 → 4I15/2) and (4S3/2 → 4I15/2) transitions of Er3+ is chosen as the thermometric index. Both of the optimum upconversion luminescence and temperature sensing sensitivity are obtained for 7 mol% Li+ co-doped sample. When the Li+ concentration is beyond 7 mol%, both the quenching in upconversion intensity and the degradation of temperature sensitivity are observed, which may be due to the serious distortion in local crystal field around Er3+ ions caused by the excess Li+ ions. |
| Databáze: | OpenAIRE |
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