8-12 July 2013
Africa/Johannesburg timezone
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Luminescent properties of Dy3+, Eu3+, Tb3+ and Sm3+ doped barium borate phosphors synthesized by solution combustion process.

Presented by Prof. Francis DEJENE on 9 Jul 2013 from 17:40 to 18:40
Type: Poster Presentation
Session: Poster1
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Powder phosphors of Dy3+, Eu3+, Tb3+ and Sm3+ doped barium borates were prepared by solution combustion reactions from mixed metal nitrate reactants and theourea (C2H4O) with ignition temperature of 500 oC. The X-ray diffraction patterns of as–synthesized powders revealed binary phases and that the barium borate phase does not crystallized directly from the combustion reaction with fuel to oxidizer ratio of 2.0. Scanning electron microscope images powders showed agglomeration and a continuous three-dimensional hexagonal network. The large hexagonal agglomerates range in size between 20 and 50 m, while the primary spherical nanoparticles ranged in size between 50 and 100 nm. The phosphors prepared by combustion reaction were photo luminescent immediately after combustion without additional heating. The phosphors exhibited the characteristic emission spectrum of Dy3+, Eu3+, Tb3+ and Sm3+. Gridding was shown to reduce but heat treatment was shown to increase the PL intensities. The initial luminescent intensities were found to be dependent on concentration of RE3+ dopant while Tb doped materials displayed the longest afterglow properties.

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