Ligand mediated excited state carrier relaxation dynamics of Cd1-xZnxSe1-ySy NCs derived from bile salts

Chatterjee, Sayantan and Maitra, Uday (2017) Ligand mediated excited state carrier relaxation dynamics of Cd1-xZnxSe1-ySy NCs derived from bile salts. In: Journal of Materials Chemistry C, 5 (20). pp. 4977-4984. ISSN 2050-7526

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Abstract

Bile salts of cadmium and zinc provide a convenient and inexpensive single step synthetic route for highly photoluminescent and stable semiconductor nanocrystals (NCs). The high thermal stabilities of cadmium and zinc deoxycholates (CdDCh2 and ZnDCh2) allow us to fine-tune the synthesis of the NCs at high temperatures while maintaining the monodispersity, crystallinity and reproducibility. Organic capping agent induced lattice strain affects the excited state relaxation processes of the NCs. The analysis of photoluminescence decay profiles revealed that the average lifetime decreased with the increasing lattice strain of the NCs. A kinetic stochastic model of photoexcited carrier relaxation dynamics of NCs has been employed to estimate the values of the radiative recombination rates, the photoluminescence quenching rates and the non-radiative recombination rates of the NCs. These data showed that the non-radiative relaxation rates and the number of surface trap states increase with the increasing lattice strain of the NCs. Such types of NCs can have great potential in nonlinear optical properties, photocatalysis and solar cells.

Item Type:	Journal Article
Publication:	Journal of Materials Chemistry C
Publisher:	Royal Society of Chemistry
Additional Information:	The Copyright of this article belongs to the Royal Society of Chemistry
Keywords:	Body fluids; Cadmium; Nonlinear optics; Optical properties; Photoluminescence; Relaxation processes; Salts; Stochastic models; Stochastic systems; Zinc; Carrier relaxation dynamics; Excited state relaxation; Non-linear optical properties; Non-radiative recombinations; Non-radiative relaxation; Photoluminescence quenching; Radiative recombination rate; Semiconductor nanocrystals; Excited states
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	01 Jun 2022 05:45
Last Modified:	01 Jun 2022 05:45
URI:	https://eprints.iisc.ac.in/id/eprint/72989

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