Self-assembly of doped semiconductor nanocrystals leading to the formation of highly luminescent nanorods

Manzoor, K and Aditya, V and Vadera, SR and Kumar, N and Kutty, TRN (2006) Self-assembly of doped semiconductor nanocrystals leading to the formation of highly luminescent nanorods. In: Applied Surface Science, 252 (11). pp. 3968-3971.

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Abstract

Meso-scale self-assembly of doped semiconductor anocrystals leading to the formation of monocrystalline nanorods showing enhanced photo- and electro-luminescence properties are reported. Polycrystalline ZnS: $Cu^+ – Al^3^+$ nanoparticles of zinc-blended (cubic) structure with an average size of ~4 nm were aggregated in aqueous solution and grown into nanorods of length ~400 nm and aspect ratio 12. Transmission electron microscope (TEM) images indicate crystal growth mechanisms involving particle-to-particle oriented-attachment assisted by sulphur–sulphur catenation leading to covalent-linkage. The nanorods exhibit self-assembly dependant luminescence properties such as quenching of the lattice defect-related emissions accompanied by enhancement of dopant-related emission, efficient low-voltage electroluminescence (EL) and super-linear voltage-brightness EL characteristics. This study demonstrates the technological importance of aggregation based self-assembly in doped semiconductor nanosystems.

Item Type:	Journal Article
Publication:	Applied Surface Science
Publisher:	Elsevier Science
Additional Information:	Copyright fo this article belongs to Elsevier Science.
Keywords:	Nanostructures;Semiconductors;Luminescence
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	21 Dec 2006
Last Modified:	01 Mar 2012 09:50
URI:	http://eprints.iisc.ac.in/id/eprint/6585

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