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Near white light emission and enhanced photocatalytic activity by tweaking surface defects of coaxial ZnO@ZnS core-shell nanorods

Kumbhakar, Partha and Biswas, Subrata and Tiwary, S Chandra and Kumbhakar, Pathik (2017) Near white light emission and enhanced photocatalytic activity by tweaking surface defects of coaxial ZnO@ZnS core-shell nanorods. In: JOURNAL OF APPLIED PHYSICS, 121 (14).

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Official URL: http://dx.doi.org/10.1063/1.4980011

Abstract

The enhancement in the emission of visible light in the synthesized coaxial ZnO@ZnS core-shell nanorods (CSNR) has led to the development of a nearly white light-emitting photoluminescent material as confirmed by the calculation of Commission Internationale de l'Eclairage chromaticity coordinates. However, we have fabricated a nearly white light-emitting diode (WLED) by combining a commercial UV LED chip with our CSNR material, and it emits warm white light. The observed increase in the relative intensity of deep level (IDLE) over UV (IUV) photoluminescence emission is attributed to the addition of new defect states during the formation of the shell with a larger thickness as becomes evident from X-ray photoelectron spectroscopy (XPS) study. Thanks to the presence of such defect states, whose effective exploitation enabled us to obtain similar to 93% photodegradation of a test dye, namely, methylene blue, in the presence of core-shell ZnO@ZnS heterostructure within only 25min of irradiation of UV-Visible light. Thus, apart from demonstrating the fabrication of a near WLED, we have successfully demonstrated the enhanced photocatalytic performance by tweaking the surface defects of ZnO nanorods via the formation of coaxial ZnO@ZnS core-shell nanorods with various shell thicknesses. Published by AIP Publishing.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 20 May 2017 06:53
Last Modified: 20 May 2017 06:53
URI: http://eprints.iisc.ac.in/id/eprint/56946

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