Based on the fluorescence intensity ratio method, the temperature- sensing behavior through thermally coupled levels (TCL) of the 2H11/2 and 4S3/2 states as well as the sublevels of the 4F9/2 state of Er3+ has been studied. The thermometry is observed to be dependent on the pump power for the 2H11/2 and 4S3/2 states, leading to an error of more than 20 K at 478 K. By utilizing the sub-levels of the 4F9/2 state, such a problem could be solved. The maximum sensitivity is about 0.15% K-1 at 298 K. This will provide guidance on selecting appropriate and practical TCL for precisely sensing the temperature.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics