1. Ultrafast exciton dynamics in colloidal aluminum phosphide nanocrystals
- Author
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Busby, Erik, Thibert, Arthur, Fuzell, Jack, Arrington, Deisy C., Jawaid, Ali M., Snee, Preston T., and Larsen, Delmar S.
- Subjects
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COLLOIDS , *ALUMINUM phosphide , *NANOCRYSTALS , *EXCITON theory , *ABSORPTION spectra , *OPTOELECTRONICS , *MOLECULAR dynamics - Abstract
Abstract: The primary exciton dynamics of colloidal indirect bandgap AlP nanocrystals are characterized with ultrafast transient absorption spectroscopy. A 400-nm excitation results in a high yield formation of an emissive exciton with a ∼1-ns lifetime and a 50-nm bandwidth red-shifted emission. Multi-wavelength target analysis is used to decompose the measured signals into sequential and parallel models, which interpret the measured data as an emissive exciton with a 1.2-ns decay time and a dark exciton which is attributed to surface trapping. Reconstructed nonlinear absorption spectra resolve a broad optical gain persisting for >1ns. The 15% emission yield demonstrates that colloidal AlP nanocrystals are useful as a potential broadband, high efficiency optoelectronics material. [Copyright &y& Elsevier]
- Published
- 2013
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