Pulsed laser deposited ZnO/ZnO:Li multilayer for blue light emitting diodes

Chirakkara, Saraswathi and Krupanidhi, SB (2011) Pulsed laser deposited ZnO/ZnO:Li multilayer for blue light emitting diodes. In: Journal of Luminescence, 131 (8). pp. 1649-1654.

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Abstract

Thin films of ZnO, Li doped ZnO (ZLO) and multilayer of ZnO and ZLO (ZnO/ZLO) were grown on silicon and corning glass substrates by pulsed laser deposition technique. Single phase formation and the crystalline qualities of the films were analyzed by X-ray diffraction and Li composition in the film was investigated to be 15 wt% by X-ray photoelectron spectroscopy. Raman spectrum reveals the hexagonal wurtzite structure of ZnO, ZLO and ZnO/ZLO multilayer and confirms the single phase formation. Films grown on corning glass shows more than 80% transmittance in the visible region and the optical band gaps were calculated to be 3.245, 3.26 and 3.22 eV for ZnO, ZLO and ZnO/ZLO, respectively. An efficient blue emission was observed in all films which were grown on silicon (1 0 0) substrate by photoluminescence (PL). PL measurements at different temperatures reveal that the PL emission intensity of ZnO/ZLO multilayer was weakly dependent on temperature as compared to the single layers of ZnO and ZLO and the wavelength of emission was independent of temperature. Our results indicate that ZnO/ZLO multilayer can be used for the fabrication of blue light emitting diodes. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Luminescence
Publisher:	Elsevier Science B.V.
Additional Information:	Copyright of this article belongs to Elsevier Science B.V.
Keywords:	Zinc oxide;Pulsed laser deposition;Li doped ZnO;Multilayer; Photoluminescence
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	18 Jul 2011 08:44
Last Modified:	18 Jul 2011 08:44
URI:	http://eprints.iisc.ac.in/id/eprint/39093

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