Reliable temperature sensing based on intense green upconversion emissions of Y2Mo4O15:Yb3+,Er3+ under 980 nm excitation
| Autor: | Wenbo Peng, Tao Pang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Dimer Relaxation (NMR) Doping Analytical chemistry Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Temperature measurement Photon upconversion 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Electrical and Electronic Engineering 0210 nano-technology Luminescence Excitation |
| Zdroj: | Physica B: Condensed Matter. 550:145-153 |
| ISSN: | 0921-4526 |
| Popis: | In this paper, Y2Mo4O15:Yb3+/Er3+ upconversion phosphors are prepared by a co-precipitation method. In the case of 20% Yb3+ doping, the intense green upconversion luminescence is obtained, which can be attributed to the energy transfer from Yb3+-MoO42- dimer to Er3+ that suppresses the multi-phonon relaxation of 4I11/2 to 4I13/2. Similar the Yb3+ sensitization, the dimer sensitization is also dependent on the Yb3+ concentration. When the Yb3+ concentration exceeds 20%, the luminescence is quenched by the cross relaxation and energy migration between dimers. A method for evaluating the reliability of temperature measurement standards is reported. Moreover, in term of the reliable temperature scale, the maximum absolute sensitivity of sample doped with 20% Yb3+ is determined to be 0.0117 K-1. Favorable sensing ability and strong upconversion luminescence indicate that the optimum sample is potentially applicable as the optical thermometric materials. |
| Databáze: | OpenAIRE |
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