Examining Exciton and Biexciton Dynamics Using Third and Fifth Order Transient Grating Measurements
Abstract
An incisive measurement of biexciton dynamics is proposed. Third and fifth order studies of colloidal CdSe quantum dots were performed on three samples with different average diameters. Both the third and fifth order measurements allowed for an examination of population dynamics. In the third order normal time ordered signal direction (-k1+k2+k3) the transient grating probes the decay of an exciton population grating as well as solution dynamics and spectral diffusion. The corresponding fifth order transient grating signal (-2k1+2k2+k3) contains additional, direct information on biexciton dynamics. Using both sets of transient grating signals, the biexciton lifetime is measured. The size dependent effect of different degrees of quantum confinement on the biexciton lifetime will be discussed.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARD10012H