Time-resolved spectroscopic study of self-trapped excitons in germanium oxides
Abstract
The decay kinetics of the recombination luminescence of self-trapped excitons (STEs) in hexagonal GeO 2 (h-GeO 2) and crystalline SiO 2 (α-quartz) have been studied at low temperature for evaluating zero-field splitting energies. For the two decay components which become observable below 50 K, temperature dependencies of the decay time and intensities are analyzed by the rate-equation model which includes nonradiative transitions among zero-field split sublevels. The analysis gives the zero-field splitting of 0.09 meV in h-GeO 2 which is almost the same as that in α-quartz. The configuration of the STE in h-GeO 2 is discussed based on the result.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- August 1996
- DOI:
- 10.1016/0168-583X(96)00013-4
- Bibcode:
- 1996NIMPB.116...72I