Surface State-Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO3 Nanowires
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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 BiFeO3 (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.
Keywords:BiFeO3 nanowires / multiferroics / photoluminescence / surface states / thermal quenching
Source:Physica Status Solidi - Rapid Research Letters, 2018, 12, 1
- Canada Excellence Research Chairs (CERC) Program, Serbian Ministry of Education, Science, and Technological development