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

Wang, Lejian, Zhang, Jingji, Wang, Jiangying, Yao, Yaxuan, Ren, Lingling, Chen, Xue, Birkett, Martin, Dala, Laurent and Xu, Bin (2020) Electro- and photon-induced cooling in BNT-BT-SBET relaxors with in situ optical temperature sensing. Optics Letters. ISSN 0146-9592 (In Press)

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Official URL: https://doi.org/10.1364/ol.391422

Abstract

A novel lead-free luminescent ferroelectric (FE) ceramic, Bi0.5Na0.5TiO3-0.06BaTiO3-0.055Sr0.7Bi0.18Er0.02□0.1TiO3, is developed with an adiabatic temperature change (ΔT) of 0.7 K under an electric-field (E) of 60 kV/cm at room temperature (RT), an anti-stokes fluorescence (FL) cooling and a maximum optical T sensitivity of 0.0055 K-1 at 522 K. Interestingly, the electrocaloric (EC) response reaches a saturation at permittivity-shoulder T of 100 oC, meanwhile the maximized emission intensity of 2H11/2→4I15/2 occurs. T- and E-tunable enhancement of 2H11/2→4I15/2 emission intensity is due to the population inversion from the 4S3/2 to 2H11/2 states caused by an incoherent regime consisting of FE phase and polar nanoregions (PNRs) in a relaxor (R) matrix.

Item Type: Article
Subjects: F200 Materials Science
F300 Physics
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 03 Apr 2020 10:27
Last Modified: 03 Apr 2020 10:30
URI: http://nrl.northumbria.ac.uk/id/eprint/42673

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