Optical Degradation Characteristics of nano-sized Eu-Complex Encapsulated by Sol-Gel Derived Silica Glass

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  • KATO Sayaka
    Graduate School of Science and Engineering, Saitama University
  • FUKUDA Takeshi
    Graduate School of Science and Engineering, Saitama University
  • HONDA Zentaro
    Graduate School of Science and Engineering, Saitama University
  • KAMATA Norihiko
    Graduate School of Science and Engineering, Saitama University

Bibliographic Information

Other Title
  • ゾルゲルガラスで封止したナノ粒子Eu錯体の劣化特性(ディスプレイ一般)
  • ゾルゲルガラスで封止したナノ粒子Eu錯体の劣化特性
  • ゾルゲルガラス デ フウシ シタ ナノ リュウシ Eu サクタイ ノ レッカ トクセイ

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Description

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.

Journal

  • ITE Technical Report

    ITE Technical Report 33.29 (0), 5-8, 2009

    The Institute of Image Information and Television Engineers

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