期刊
JOURNAL OF LUMINESCENCE
卷 197, 期 -, 页码 23-30出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2017.12.072
关键词
Phosphor thermometry; Luminescence; YSO; Dysprosium
类别
资金
- Bavaria on the Move initiative of the state of Bavaria
- Bayerische Forschungsstiftung [DOK-170-14]
- Erlangen Graduate School in Advanced Optical Technologies (SAOT) by the German Research Foundation (DFG) in the framework of the German excellence initiative
- Cluster of Excellence Engineering of Advanced Materials'' (EAM) at the Universitat Erlangen-Nurnberg
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [ZI 1384/1]
Dy3+-doped yttrium orthosilicate (Y2SiO5, abbreviated YSO) phosphors were synthesized: (1) by conventional high temperature solid-state method using two types of fluxes: lithium fluoride (LiF) and boron oxide (B2O3); (2) by metal alkoxide sol-gel method using isopropoxide assisted co-precipitation with subsequent annealing to explore its possible application in high-temperature thermometry. It was experimentally observed that the use of LiF flux affects the luminescent properties due to improvement of the crystal quality of crystallites and co-doping Li+ and F-ions. Herein, a strategy involving the use of different fluxes and concentration of Dy3+ ions has been developed to achieve high photoluminescence (PL) intensity and high intensity ratio of different PL peaks. The case of incorporated LiF in the host crystal lattices revealed strong enhancement of luminescence intensity of YSO:Dy (more than three times higher at 293 K) compared to the luminescence intensity of the phosphors synthesized with B2O3. Based on the results of high temperature measurements, it can be stated that YSO: Dy is a favorable phosphor for high temperature measurement, with a temperature sensitivity range comparable to YAG:Dy but with a lower PL decay time which is reduced by about 60%. For temperatures up to 1250 K the intensity ratio approach offers better measurement capabilities while the temperature sensitivity above 1250 K is superior for the decay time approach.
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