Abstract
We present direct evidence of the two-step absorption process in anti-Stokes photoluminescence in both and heterostructures using two-color picosecond and continuous-wave photoluminescence experiments. We show information about the lifetime of the defect states that participate in the two-step absorption process. As a result, we conclude that the long-lived states rather than excitons play the dominant role in the two-step absorption process. We also study the possible contribution of the two-step absorption process to Stokes carrier transfer in asymmetric double quantum well structures.
- Received 18 May 1999
DOI:https://doi.org/10.1103/PhysRevB.60.8883
©1999 American Physical Society