| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1515237 | Journal of Physics and Chemistry of Solids | 2016 | 4 Pages |
•NBT:Er nanocrystals were prepared by hydrothermal method.•A two-photon absorption mechanism in the upconversion emission process is proposed.•The temperature-sensing properties of the NBT:Er nanocrystals is demonstrated.•The sensitivity of the nanocrystals is higher than that of its bulk form.
In this work we demonstrate the preparation of Er3+ doped perovskite ferroelectric Na0.5Bi0.5TiO3 nanocrystals and their application in temperature sensing. The samples were synthesized via a facile hydrothermal method. Upconversion emission at 528 nm and 547 nm from two thermodynamically coupled excited states of Er3+ were recorded in the temperature from 80 K to 480 K under the excitation of a 980 nm diode laser. The emission intensity ratio (I528/I547) as a function of the temperature was investigated. A sensitivity of 0.0053 K−1 is observed at 400 K, suggesting they are promising candidate for nanothermometers.
