Electro- and photon-induced cooling in BNT-BT-SBET relaxors with in situ optical temperature sensing

Lejian Wang, Jingji Zhang, Jiangying Wang, Yaxuan Yao, Lingling Ren, Xue Chen, Martin Birkett, Laurent Dala, Ben Bin Xu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A novel lead-free luminescent ferroelectric (FE) ceramic, Bi 0.5Na 0.5TiO 3-0.06 BaTiO 3-0.055 Sr 0.7Bi 0.18Er 0.02 0.1 TiO 3 (BNT-BT-SBET), is developed with an adiabatic temperature change (ΔT) of 0.7 K under an electric field (E) of 60 kV/cm at room temperature, an anti-Stokes fluorescence cooling, and a maximum optical T sensitivity of 0.0055 K -1 at 522 K. Interestingly, the electrocaloric response reaches a saturation at permittivity shoulder T of 100°C; meanwhile, the maximized emission intensity of 2H 11/24I 15/2 occurs. T- and E-tunable enhancement of 2H 11/24I 15/2 emission intensity is due to the population inversion from the 4S 3/2 to 2H 11/2 states caused by an incoherent regime consisting of FE phase and polar nanoregions in a relaxor matrix.

Original languageEnglish
Pages (from-to)2391-2394
Number of pages4
JournalOptics Letters
Volume45
Issue number8
Early online date14 Apr 2020
DOIs
Publication statusPublished - 15 Apr 2020

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