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Temperature dependent excited state dynamics in dual emissive CdSe nano-tetrapods

Abstract

Time resolved spectroscopic investigation has been performed on nano–tetrapods, which are exotic nanocrystals with zinc blende type core structure and four arms with wurtzite structure. Dual emission is observed in these nanostructures. A band-edge emission occurs at 500-600 nm and a broad surface state emission occurs in the 600-900 nm region. The band-edge emission decays almost completely in a few ps, indicating the operation of an efficient trapping process. Incomplete recovery kinetics of ground state bleach from transient absorption experiments signifies the existence of a long-lived excited state. The lifetime of the surface state emission is in tens of nanoseconds. At liquid nitrogen temperature, surface state emission is enhanced to a greater degree than band edge emission, indicating suppression of various deactivation pathways at this temperature. Thus, an idea of excited state dynamics of these systems is developed, with a view of future tuning of photoluminescence properties by playing with the different radiative and nonradiative pathways involved.

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Publication details

The article was received on 11 Oct 2017, accepted on 22 Dec 2017 and first published on 22 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06954E
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Temperature dependent excited state dynamics in dual emissive CdSe nano-tetrapods

    S. Banerjee, A. Gupta, R. Srivastava and A. Datta, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06954E

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