Abstract

Based on the fluorescence intensity ratio method, the temperature-sensing behavior through thermally coupled levels (TCL) of the H11/22 and S3/24 states as well as the sub-levels of the F9/24 state of Er3+ has been studied. The thermometry is observed to be dependent on the pump power for the H11/22 and S3/24 states, leading to an error of more than 20 K at 478 K. By utilizing the sub-levels of the F9/24 state, such a problem could be solved. The maximum sensitivity is about 0.15%  K1 at 298 K. This will provide guidance on selecting appropriate and practical TCL for precisely sensing the temperature.

© 2016 Optical Society of America

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