Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4874265
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Funding
- DNDO Academic Research Initiative [NSF/ARI 083007]
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The temperature dependence of the indirect bandgap in thallium bromide has been determined using variable temperature (5K to 300 K) cathodoluminescence. The spectra include transitions associated with both the indirect (2.66 eV at 5K) and the direct (3.0 eV at 5K) bandgaps. Leastsquares analysis has been used to obtain fitting parameters for three analytical models commonly applied to describe the dependence of the bandgap on temperature for the lowest energy indirect transition. The indirect bandgap emission shifts to an energy of 2.86 eV at 300 K. We find a significant difference in the behavior of the luminescence associated with the direct bandgap, which does not appear to shift to the extent predicted by earlier measurements of the exciton absorption edge. (C) 2014 AIP Publishing LLC.
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