Enhanced upconversion luminescence and optical temperature sensing performance in Er3+ doped BaBi2Nb2O9 ferroelectric ceramic

Optical Temperature-Sensing Performance of La2Ce2O7:Ho3+ Yb3+ Powders

“…The mixed powders were ground with an agate grinder for 1 h. The resultant powder mixtures were thermally treated in a Muffle furnace by the following sintering procedure: raised to 1370 K from room temperature within 150 min, then raised to 1890 K within 120 min and kept for 300 min, and finally cooled down to room temperature naturally. For the following characterizations, the obtained products were ground into fine powders with an agate grinder for 1 h. Due to the small energy gap between 2 H 11/2 and 4 S 3/2 of the Er 3+ ions, the FIR conforms to the Boltzmann distribution and has a high sensitivity to temperature variation; Er 3+ has been most extensively investigated by researchers [19,20]. In addition, in recent years, there have been numerous studies on the temperature-sensing performance of Ho 3+ -activated phosphor materials [21,22].…”

“…However, reports on the optical temperaturesensing performance of rare earth-doped La2Ce2O7 materials are few [18,19]. Due to the small energy gap between 2 H11/2 and 4 S3/2 of the Er 3+ ions, the FIR conforms to the Boltzmann distribution and has a high sensitivity to temperature variation; Er 3+ has been most extensively investigated by researchers [19,20]. In addition, in recent years, there have been numerous studies on the temperature-sensing performance of Ho 3+ -activated phosphor materials [21,22].…”