Microstructure and luminescent properties of Eu2W 2O9 phosphors

Kyung Hoon Cho; Kyoung Pyo Hong; Sahn Nahm; Bo Yun Jang; Joo Seok Park; Soon Jae Yoo

doi:10.1007/s10832-008-9491-5

Microstructure and luminescent properties of Eu₂W ₂O₉ phosphors

Kyung Hoon Cho, Kyoung Pyo Hong, Sahn Nahm, Bo Yun Jang, Joo Seok Park, Soon Jae Yoo

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

A homogeneous Eu₂W₂O₉ 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 Eu₂W₂O₉ phosphor were similar to those of the Eu₂(WO₄)₃ phosphor, but the absorption band due to the O^2-→W⁶⁺ ligand to metal charge transfer was shifted to lower energies and the ⁷F_o→ ⁵H₃ and ⁷F_o→⁵F _2,4 transitions were not found. The intensity of the excitation and emission spectra of the Eu₂W₂O₉ 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 Eu₂W₂O₉ phosphor was higher than that of the Eu₂(WO₄)₃ phosphor. Moreover, the addition of LiCl to the Eu₂W₂O₉ phosphors considerably enhanced the intensity of their emission spectra, probably due to the increased grain size. Therefore, LiCl-added, Eu₂W₂O₉ phosphor is a promising candidate material for red color emission.

Original language	English
Pages (from-to)	98-104
Number of pages	7
Journal	Journal of Electroceramics
Volume	22
Issue number	1-3
DOIs	https://doi.org/10.1007/s10832-008-9491-5
Publication status	Published - 2009 Feb

Bibliographical note

Funding Information:
Acknowledgement This work was supported by a Korea Energy Management Corporation Grant (2005-E-FM11-P-11-3-030-2006).

Keywords

EuWO
Microstructure
Photo-luminescence
Red phosphor

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Mechanics of Materials
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1007/s10832-008-9491-5

Cite this

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title = "Microstructure and luminescent properties of Eu2W 2O9 phosphors",

abstract = "A homogeneous Eu2W2O9 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 Eu2W2O9 phosphor were similar to those of the Eu2(WO4)3 phosphor, but the absorption band due to the O2-→W6+ ligand to metal charge transfer was shifted to lower energies and the 7Fo→ 5H3 and 7Fo→5F 2,4 transitions were not found. The intensity of the excitation and emission spectra of the Eu2W2O9 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 Eu2W2O9 phosphor was higher than that of the Eu2(WO4)3 phosphor. Moreover, the addition of LiCl to the Eu2W2O9 phosphors considerably enhanced the intensity of their emission spectra, probably due to the increased grain size. Therefore, LiCl-added, Eu2W2O9 phosphor is a promising candidate material for red color emission.",

keywords = "EuWO, Microstructure, Photo-luminescence, Red phosphor",

author = "Cho, {Kyung Hoon} and Hong, {Kyoung Pyo} and Sahn Nahm and Jang, {Bo Yun} and Park, {Joo Seok} and Yoo, {Soon Jae}",

note = "Funding Information: Acknowledgement This work was supported by a Korea Energy Management Corporation Grant (2005-E-FM11-P-11-3-030-2006).",

year = "2009",

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doi = "10.1007/s10832-008-9491-5",

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AU - Cho, Kyung Hoon

AU - Hong, Kyoung Pyo

AU - Nahm, Sahn

AU - Jang, Bo Yun

AU - Park, Joo Seok

AU - Yoo, Soon Jae

N1 - Funding Information: Acknowledgement This work was supported by a Korea Energy Management Corporation Grant (2005-E-FM11-P-11-3-030-2006).

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N2 - A homogeneous Eu2W2O9 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 Eu2W2O9 phosphor were similar to those of the Eu2(WO4)3 phosphor, but the absorption band due to the O2-→W6+ ligand to metal charge transfer was shifted to lower energies and the 7Fo→ 5H3 and 7Fo→5F 2,4 transitions were not found. The intensity of the excitation and emission spectra of the Eu2W2O9 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 Eu2W2O9 phosphor was higher than that of the Eu2(WO4)3 phosphor. Moreover, the addition of LiCl to the Eu2W2O9 phosphors considerably enhanced the intensity of their emission spectra, probably due to the increased grain size. Therefore, LiCl-added, Eu2W2O9 phosphor is a promising candidate material for red color emission.

AB - A homogeneous Eu2W2O9 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 Eu2W2O9 phosphor were similar to those of the Eu2(WO4)3 phosphor, but the absorption band due to the O2-→W6+ ligand to metal charge transfer was shifted to lower energies and the 7Fo→ 5H3 and 7Fo→5F 2,4 transitions were not found. The intensity of the excitation and emission spectra of the Eu2W2O9 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 Eu2W2O9 phosphor was higher than that of the Eu2(WO4)3 phosphor. Moreover, the addition of LiCl to the Eu2W2O9 phosphors considerably enhanced the intensity of their emission spectra, probably due to the increased grain size. Therefore, LiCl-added, Eu2W2O9 phosphor is a promising candidate material for red color emission.

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