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Rapid Synthesis of Nanocrystalline ZnGa2O4 Phosphor at Low Temperature

Published online by Cambridge University Press:  25 April 2012

Suresh D. Kulkarni  and
S. A. Shivashankar
Suresh D. Kulkarni
Affiliation:
Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, India. Materials Research Centre, Indian Institute of Science, Bangalore, India.
S. A. Shivashankar
Affiliation:
Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, India. Materials Research Centre, Indian Institute of Science, Bangalore, India.
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Abstract

A novel microwave-assisted synthesis technique was used for the rapid preparation of nanocrystalline ZnGa2O4 at two different temperatures. The crystalline spinel oxide is formed at temperatures as low as 100 oC within few minutes, at a high yield of 96%, requiring no post-synthesis annealing. The as-prepared samples are polycrystalline and phase-pure as verified by XRD, with a crystallite size of ∼5 nm. Polycrystalline ZnGa2O4 substituted with Mn2+, Cr3+, Cu2+, and Co2+ was also similarly prepared. All samples are highly monodispersed, as measured by TEM. The ZnGa2O4 nanocrystals without further surface modification can be readily dispersed in chloroform to form a fully transparent colloidal solution, using which the bandgap of ZnGa2O4 was determined to be ~4.5 eV. The entire synthesis procedure, including solution preparation, microwave irradiation, and centrifugation takes about 30 minutes, which is faster than any procedure reported for a complex oxide like ZnGa2O4, as well as one with a small thermal budget. Photoluminescence shows a broad emission extending from 330 nm to 800 nm, which is surmised to be due to the defect structure in the oxide produced.

Keywords

luminescenceoptical propertiestransparent conductor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1406: Symposium Z – Functional Metal-Oxide Nanostructures , 2012 , mrsf11-1406-z09-02
Copyright
Copyright © Materials Research Society 2012

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