Premium
Surface State‐Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO 3 Nanowires
Author(s) -
Prashanthi Kovur,
Antić Željka,
Thakur Garima,
Dramićanin Miroslav D.,
Thundat Thomas
Publication year - 2018
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201700352
Subject(s) - quenching (fluorescence) , materials science , photoluminescence , luminescence , nanowire , multiferroics , semiconductor , condensed matter physics , surface states , thermal , optoelectronics , nanotechnology , surface (topology) , optics , fluorescence , thermodynamics , ferroelectricity , physics , geometry , mathematics , dielectric
Wide‐bandgap semiconductor nanowires with surface defect emission centers have the potential to be used as sensitive thermometers and optical probes. Here, we show that the green luminescence of multiferroic BiFeO 3 (BFO) nanowires shows an anomalous negative thermal quenching (NTQ) with increasing temperatures. The release of trapped carriers from localized surface defect states is suggested as the possible mechanism for the increased green luminescence which was experimentally observed at elevated temperatures. A reasonable interpretation of the photoluminescence (PL) processes in BFO nanowires is achieved, and the activation energies of the PL quenching and thermal hopping are deduced. Negative thermal quenching of BFO nanowires provides a new strategy for optical thermometry at higher temperatures.