Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetime

Crooker, S. A.; Barrick, T.; Hollingsworth, J. A.; Klimov, V. I.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2793
Academic Journal
We investigate the strongly temperature-dependent radiative lifetime of electron-hole excitations in colloidal CdSe nanocrystal quantum dots over nearly three orders of magnitude in temperature (300 K to 380 mK). These studies reveal an intrinsic, radiative upper limit of ∼1 μs for the storage of excitons below 2 K. At higher temperatures, exciton lifetimes are consistent with thermal activation from the dark-exciton ground state, but with two different activation thresholds.


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