Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11006842 | Optical Materials | 2018 | 8 Pages |
Abstract
Optical thermometry based on the adjacent thermally coupled levels of rare earth ions has been widely studied in the high temperature range, and shows unobvious effect at low temperature range. In this work, we propose a new method to achieve optical thermometry in 10Ë300â¯K range through manipulating the energy transfer from WO66â to Ho3+. A comprehensive five-level rate-equation model is developed to establish the relation between lifetime ratios and temperature. It is found that the lifetime ratios of 540â¯nm (Ho3+) and 471â¯nm (WO66â) emissions are dependent on the phonon energy of Y2WO6 host and temperature. The values of sensor sensitivity reach the maximum 2.1% Kâ1 at 211â¯K in 30%Ho3+ doped Y2WO6, which is higher than the maximum of the reported phosphors at low temperature. It overcomes the shortcoming of unobvious thermal population of thermally coupled levels in low temperature range through traditional Boltzmann distributing method.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Jing Wang, Yanyan Bu, Xiangfu Wang, Hyo Jin Seo,