NDLI: Microstructure and luminescent properties of Eu$_{2}$W$_{2}$O$

Content Provider	Springer Nature Link
Author	Cho, Kyung Hoon Hong, Kyoung Pyo Nahm, Sahn Jang, Bo Yun Park, Joo Seok Yoo, Soon Jae
Copyright Year	2008
Abstract	A homogeneous Eu$_{2}$W$_{2}$O$_{9}$ phase with small grains (∼4.0μm) was formed for the specimens fired below 1175°C. As the firing temperature was increased above 1150°C, grain growth occurred and the grain shape changed from faceted to round. The excitation spectra of the Eu$_{2}$W$_{2}$O$_{9}$ phosphor were similar to those of the Eu$_{2}$(WO$_{4}$)$_{3}$ phosphor, but the absorption band due to the O$^{2−}$→W$^{6+}$ ligand to metal charge transfer was shifted to lower energies and the $^{7}$F$_{o}$→$^{5}$H$_{3}$ and $^{7}$F$_{o}$→$^{5}$F$_{2,4}$ transitions were not found. The intensity of the excitation and emission spectra of the Eu$_{2}$W$_{2}$O$_{9}$ phosphor considerably increased with increasing firing temperature, due to the increased grain size and changed grain shape. The intensity of the red emission band of the Eu$_{2}$W$_{2}$O$_{9}$ phosphor was higher than that of the Eu$_{2}$(WO$_{4}$)$_{3}$ phosphor. Moreover, the addition of LiCl to the Eu$_{2}$W$_{2}$O$_{9}$ phosphors considerably enhanced the intensity of their emission spectra, probably due to the increased grain size. Therefore, LiCl-added, Eu$_{2}$W$_{2}$O$_{9}$ phosphor is a promising candidate material for red color emission.
Starting Page	98
Ending Page	104
Page Count	7
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	22
Issue Number	1-3
e-ISSN	15738663
Language	English
Publisher	Springer US
Publisher Date	2008-04-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Red phosphor Eu$_{2}$W$_{2}$O$_{9}$ Photo-luminescence Microstructure Crystallography Electrochemistry Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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