Abstract
We have performed time resolved photoluminescence measurements of the exciton recombination in different GaN samples at low temperatures. In epitaxial layers the decay time of the free exciton is typically faster than 100 ps. This is due to a dominating non-radiative recombination process. In thick bulk samples we have resolved and measured the decay time of the free exciton with a value of about 200 ps. We believe that this value is close to the radiative lifetime for free excitons in GaN. We have also shown that excitation transfer occurs between free and bound exciton states. We have furthermore measured the decay of the donor and acceptor bound excitons, and obtained values of the decay time of 250 ps and 1200 ps, respectively.
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Bergman, J., Harris, C., Monemar, B. et al. Exciton Lifetimes in GaN. MRS Online Proceedings Library 395, 709–714 (1995). https://doi.org/10.1557/PROC-395-709
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DOI: https://doi.org/10.1557/PROC-395-709