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

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 coordinat...

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Bibliographic Details
Published in:Journal of applied physics 2017-04, Vol.121 (14)
Main Authors: Kumbhakar, Partha, Biswas, Subrata, Tiwary, Chandra S., Kumbhakar, Pathik
Format: Article
Language:English
Subjects:
Applied physics
Catalytic activity
Chromaticity
Heterostructures
Idling
Light emission
Light emitting diodes
Luminous intensity
Methylene blue
Nanorods
Photocatalysis
Photodegradation
Photoluminescence
Surface defects
White light
X ray photoelectron spectroscopy
X ray spectra
Zinc oxide
Zinc sulfide
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Summary: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 ∼93% photodegradation of a test dye, namely, methylene blue, in the presence of core-shell ZnO@ZnS heterostructure within only 25 min 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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4980011