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Optical and nonlinear absorption properties of Na doped ZnO nanoparticle dispersions

Karthikeyan, B and Sandeep, CS Suchand and Pandiyarajan, T and Venkatesan, P and Philip, Reji (2009) Optical and nonlinear absorption properties of Na doped ZnO nanoparticle dispersions. In: Applied Physics Letters, 95 (2).

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We report linear and nonlinear optical properties of the biologically important Na doped ZnO nanoparticle dispersions. Interesting morphological changes involving a spherical to flowerlike transition have been observed with Na doping. Optical absorption measurements show an exciton absorption around 368 nm. Photoluminescence measurements reveal exciton recombination emission, along with shallow and deep trap emissions. The increased intensity of shallow trap emission with Na doping is attributed to oxygen deficiency and shape changes associated with doping. Nonlinear optical measurements show a predominantly two-photon induced, excited state absorption, when excited with 532 nm, 5 ns laser pulses, indicating potential optical limiting applications.

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics
Additional Information: Copy rights of this article belongs to American Institute of Physics.
Keywords: Disperse Systems; II-VI Semiconductors; Nanoparticles; Nonlinear Optics; Photoluminescence; Sodium; Solid-State Phase Transformations; Ultraviolet Spectra; Wide Band Gap Semiconductors; Zinc Compounds
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Dec 2009 07:42
Last Modified: 19 Sep 2010 05:40
URI: http://eprints.iisc.ac.in/id/eprint/22096

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