Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7907355 | Optical Materials | 2018 | 7 Pages |
Abstract
Tm3+/Yb3+:Y2O3 nanoparticles (NPs) were prepared by solution combustion method. The prepared NPs are confirmed to be pure cubic Y2O3 phase with the mean size of about 45â¯nm by X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) observation. Under 980â¯nm excitation, the temperature dependent upconversion (UC) emission spectra of the NPs are obtained. It is found that the NPs show color tunability with a variation in temperature (from blue to almost white) and also a relatively good suppression of temperature quenching (i.e. â¼70.4% of the initial intensity at 473â¯K). By using the fluorescent intensity ratio (FIR) technique, the temperature sensing behaviors are investigated based on the thermal coupled 1G4(a) (477â¯nm) and 1G4(b) (490â¯nm) levels and non-thermal coupled 3F2,3 (684â¯nm) and 1G4(b) (490â¯nm) levels from Tm3+ ions, respectively. The results demonstrate that both the absolute sensitivity (Sa) and relative sensitivity (Sr) values based on non-thermal coupled levels of 3F2,3 and 1G4(b) is larger in the experimental temperature range. The maximum Sa and Sr values are obtained to be â¼1170â¯Ãâ¯10â4â¯Kâ1â¯at 573â¯K and â¼1.51%Kâ1 at 445â¯K, respectively. Therefore, the studied material is a potential multifunctional composite for optical thermometry and temperature safety sign.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Guangrun Chen, Ruoshan Lei, Huanping Wang, Feifei Huang, Shilong Zhao, Shiqing Xu,