The dynamics of the exciton and the biexciton related emission from a single InGaN quantum dot (QD) have been measured by time-resolved microphotoluminescence spectroscopy. An exciton-biexciton pair of the same QD was identified by the combination of power dependence and polarization-resolved spectroscopy. Moreover, the spectral temperature evolution was utilized in order to distinguish the biexciton from a trion. Both the exciton and the biexciton related emission reveal mono-exponential decays corresponding to time constants of ∼900 and ∼500 ps, respectively. The obtained lifetime ratio of ∼1.8 indicates that the QD is small, with a size comparable to the exciton Bohr radius.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)