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Y 4.67 Si 3 O 13 ‐based phosphors: Structure, morphology and upconversion luminescence for optical thermometry
Author(s) -
Zhang Jia,
Chen Yu
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16436
Subject(s) - phosphor , luminescence , photon upconversion , materials science , doping , analytical chemistry (journal) , ion , optoelectronics , chemistry , organic chemistry , chromatography
How to improve the sensitivity of the temperature‐sensing luminescent materials is one of the most important objects currently. In this work, to obtain high sensitivity and learn the corresponding mechanism, the rare earth (RE) ions doped Y 4.67 Si 3 O 13 (YS) phosphors were developed by solid‐state reaction. The phase purity, structure, morphology and luminescence characteristics were evaluated by XRD, TEM, emission spectra, etc. The change of the optical bandgaps between the host and RE‐doped phosphors was found, agreeing with the calculation results based on density‐functional theory. The temperature‐dependence of the upconversion (UC) luminescence revealed that a linear relationship exists between the fluorescence intensity ratio of Ho 3+ and temperature. The theoretical resolution was evaluated. High absolute (0.083 K −1 ) and relative (3.53% K −1 at 293 K) sensitivities have been gained in the YS:1%Ho 3+ , 10%Yb 3+ . The effect of the Yb 3+ doping concentration and pump power on the sensitivities was discussed. The pump‐power–dependence of the UC luminescence indicated the main mechanism for high sensitivities in the YS:1%Ho 3+ , 10%Yb 3+ . Moreover, the decay‐lifetime based temperature sensing was also evaluated. The above results imply that the present phosphors could be promising candidates for temperature sensors, and the proposed strategies are instructive in exploring other new temperature sensing luminescent materials.