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Spherical and rod-like Gd2O3:Eu3+ nanophosphors-Structural and luminescent properties

Dhananjaya, N and Nagabhushana, H and Nagabhushana, BM and Rudraswamy, B and Shivakumara, C and Chakradhar, RPS (2012) Spherical and rod-like Gd2O3:Eu3+ nanophosphors-Structural and luminescent properties. In: BULLETIN OF MATERIALS SCIENCE, 35 (4). pp. 519-527.

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Abstract

A comparative study of spherical and rod-like nanocrystalline GdO:Eu (GdEuO) red phosphors prepared by solution combustion and hydrothermal methods have been reported. Powder X-ray diffraction (PXRD) results confirm the as-formed product in combustion method showing mixed phase of monoclinic and cubic of GdO:Eu. Upon calcinations at 800C for 3 h, dominant cubic phase was achieved. The as-formed precursor hydrothermal product shows hexagonal Gd(OH):Eu phase and it converts to pure cubic phase of GdO:Eu on calcination at 600C for 3 h. TEM micrographs of hydrothermally prepared cubic GdO:Eu phase shows nanorods with a diameter of 15 nm and length varying from 50 to 150 nm, whereas combustion product shows the particles to be of irregular shape, with different sizes in the range 50-250 nm. Dominant red emission (612 nm) was observed in cubic GdO:Eu which has been assigned to transition. However, in hexagonal Gd(OH):Eu, emission peaks at 614 and 621 nm were observed. The strong red emission of cubic GdO:Eu nanophosphors by hydrothermal method are promising for high performance display materials. The variation in optical energy bandgap () was noticed in as-formed and heat treated systems in both the techniques. This is due to more ordered structure in heat treated samples and reduction in structural defects.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to INDIAN ACAD SCIENCES
Keywords: Red phosphor; combustion; hydrothermal; photoluminescence; optical
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 10 Dec 2012 06:16
Last Modified: 11 Dec 2012 06:03
URI: http://eprints.iisc.ac.in/id/eprint/45230

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