Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 20, Issue 6, Pages 4200-4207Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp06954e
Keywords
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Funding
- NCPRE, IIT Bombay
- FIST programme of DST
- Department of Biotechnology
- UGC research fellowship
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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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