Preparation and luminescent characteristics of Eu3+-activated MgxZn1-xGa2O4 nanocrystals

Nanometer-scale Eu-doped MgxZn1-xGa2O4 phosphor powders have been synthesized by sol-gel process. The crystallization behaviors were investigated as well as the excitation and photoluminescence spectra employed to study the luminescence properties of Eu3 in Mg-Zn mixed gallate. The grain size gradua...

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Bibliographic Details
Published in:Journal of alloys and compounds 2006-01, Vol.407 (1-2), p.289-293
Main Authors: TSAI, Bin-Siang, CHANG, Yen-Hwei, CHEN, Yu-Chung
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Nanocrystals and nanoparticles
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Physics
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Summary:Nanometer-scale Eu-doped MgxZn1-xGa2O4 phosphor powders have been synthesized by sol-gel process. The crystallization behaviors were investigated as well as the excitation and photoluminescence spectra employed to study the luminescence properties of Eu3 in Mg-Zn mixed gallate. The grain size gradually decreases from 32.5 to 8.6 nm as Mg content increases. The excitation spectrum varies with the composition and consists of a weak charge transfer band and intense f-f transitions. Under the excitation at 394nm, the Eu-doped MgxZn1-xGa2O4 phosphors display strong red luminescence at about 612 nm belonging to 5D0 - > 7F2 electric dipole transition. Both the emission intensity and life-time increase with the arising concentration of Mg.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.06.021