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Nanostructured red-emitting MgGa2O4:Eu3+ phosphors

Published online by Cambridge University Press:  03 March 2011

Bin-Siang Tsai ,
Yen-Hwei Chang  and
Yu-Chung Chen
Bin-Siang Tsai
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan, Republic of China
Yen-Hwei Chang*
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan, Republic of China
Yu-Chung Chen
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan, Republic of China
*
a) Address all correspondence to this author. e-mail: enphei@mail.ncku.edu.tw
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Abstract

Nano-grained phosphors of Eu3+-doped MgGa2O4 crystallites were prepared by sol-gel technique. The characterization and optical properties of luminescent MgGa2O4:Eu3+ powders have been investigated. The dried sol-gel powders were calcined in air at different temperature from 600 to 1000 °C for 5 h. The x-ray diffraction profiles showed that the MgGa2O4:Eu3+ powders began to crystallize around 600 °C and formed stable MgGa2O4 phase in the temperature range of 600–900 °C. The transmission electron microscopy morphology observations revealed that the fired powders exhibit small grain size less than 20 nm. In the PL studies, under ultraviolet (394 nm) excitation, the calcined powders emitted bright red luminescence (615 nm, 5D0→7F2), and the powders fired at 900 °C were found to have the maximum photoluminescence intensity. The quenching concentration of Eu3+ in MgGa2O4 crystallites was also indicated to be about 5∼6 mol%.

Keywords

LuminescenceSol-gelNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1504 - 1508
Copyright
Copyright © Materials Research Society 2004

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