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

Research output: Contribution to journalArticle



External departments

  • China Jiliang University
  • National Institute of Metrology China


Original languageEnglish
JournalOptics Letters
Publication statusAccepted/In press - 23 Mar 2020
Publication type

Research output: Contribution to journalArticle


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.