Presentation 2009-07-23
Optical Degradation Characteristics of nano-sized Eu-Complex Encapsulated by Sol-Gel Derived Silica Glass
Sayaka KATO, Takeshi FUKUDA, Zentaro HONDA, Norihiko KAMATA,
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Abstract(in English) Since Eu-complex generates bright red-emission by a violet excitation, it has been attracted much attention as phosphors for white light-emitting diodes (LEDs). However, the organic-ligand of Eu-complex is easily decomposed by free oxygen and water. In previous papers, we demonstrated the encapsulation technique of Eu-complex using the sol-gel derived silica glass. In this research, we used tetraethoxysilane, deionized water, ethanol, N,N-Dimethoxyformamide, and ammonia for a starting solution to form the silica glass around Eu-complex. By optimizing the fabrication condition, the nano-sized Eu(TTA)_3phen encapsulated by the sol-gel derived silica glass was successfully achieved. The Eu(TTA)_3phen powder showed a half brightness time of 67 minute while irradiating the ultraviolet light with the center wavelength of 360nm and the optical intensity of 5mW/cm^2, however, that of the encapsulated sample indicated that of 262 minutes. The improvement in the half brightness time was realized approximately 4-times by optimizing the encapsulating process.
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Keyword(in English) Sol-Gel Process / Eu-Complex / Encapsulation / Silica Glass / Optical Degradation Characteristics
Paper # EID2009-13
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Committee EID
Conference Date 2009/7/16(1days)
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Language JPN
Title (in Japanese) (See Japanese page)
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Title (in English) Optical Degradation Characteristics of nano-sized Eu-Complex Encapsulated by Sol-Gel Derived Silica Glass
Sub Title (in English)
Keyword(1) Sol-Gel Process
Keyword(2) Eu-Complex
Keyword(3) Encapsulation
Keyword(4) Silica Glass
Keyword(5) Optical Degradation Characteristics
1st Author's Name Sayaka KATO
1st Author's Affiliation Graduate School of Science and Engineering, Saitama University()
2nd Author's Name Takeshi FUKUDA
2nd Author's Affiliation Graduate School of Science and Engineering, Saitama University
3rd Author's Name Zentaro HONDA
3rd Author's Affiliation Graduate School of Science and Engineering, Saitama University
4th Author's Name Norihiko KAMATA
4th Author's Affiliation Graduate School of Science and Engineering, Saitama University
Date 2009-07-23
Paper # EID2009-13
Volume (vol) vol.109
Number (no) 146
Page pp.pp.-
#Pages 4
Date of Issue