期刊
JOURNAL OF LUMINESCENCE
卷 211, 期 -, 页码 32-38出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2019.03.021
关键词
Upconversion; Energy transfer; Cross-relaxation; Mathematical expression; Temperature sensing
类别
资金
- National Natural Science Foundation of China [11464017, 11864015]
- Scientific Research Foundation for Universities from the Education Bureau of Jiangxi Province [GJJ170490]
- Foundation of Natural Science Funds for Distinguished Young Scholar of Jiangxi Province [20171BCB23064]
- Science and Technology Major Project of Jiangxi Province [20165ABC28010]
- Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology [JXUSTQJYC2016005]
Energy transfer (ET) and cross-relaxation (CR) processes play significant roles in regulating emitting colors and intensity of upconversion (UC) materials. Calculating the coefficients in ET and CR processes can provide visual descriptions for evaluating the UC luminescence properties. Here, we find that those ET and CR processes are responsible for the color-tunable properties in Gd2Ce2O7: Yb3+, Er3+ phosphors. By solving the rate equation, mathematical expressions are established to calculate the ET and CR coefficients based on the experimental UC spectra and lifetimes. The results are benefit to evaluate the efficiencies of ET and CR processes in quantization in different Yb3+ ion concentrations doped samples. The coefficients of ET process arise from 1.05 to 7.93x10(17) cm(3)s(-1) while those of CR process increase from 2.69 to 72.01x10(17) cm(3)s(-1) with increasing the Yb3+ ion concentration, which suggest that the CR and ET processes are efficient in Gd2Ce2O7 host. Furthermore, potential temperature sensing properties are also evaluated according to the fluorescence intensity ratio of H-2(11/2) and S-4(3/2) levels and the maximal sensitivity (S) is achieved about 0.00337 K-1 at 503 K. This work provides an insight into the evaluation of those UC processes and reveals the capacity in color-tunable and temperature sensing aspects.
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