Jpn. J. Appl. Phys. 43 (2004) pp. L372-L374  |Previous Article| |Next Article|  |Table of Contents|
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Letter

Formation of Eu²⁺ in SiO₂-Al₂O₃ Glass During Thermal Treatment in Sol-Gel Process

Norihiko Kamata, Kenji Tosaka, Zentaro Honda and Koji Yamada

(Received December 22, 2003; accepted January 10, 2004; published February 20, 2004)

Although the Eu ion in a glass matrix is most stable in its trivalent form Eu³⁺, we found that a distinct blue photoluminescence (PL) from Eu²⁺ in Eu-doped SiO₂-Al₂O₃ glasses was obtained without any deoxidizing treatments after a conventional sol-gel process. The incorporation of Al in a correct proportion to the concentration of Eu is essential for stabilizing Eu²⁺ during thermal treatment in the process. In order to understand the effect of the thermal treatment, we combined the result of thermal analysis with that of PL as a function of heating temperature. The PL spectral change from the defect-originated emission to the blue emission due to Eu²⁺ occurred at the temperature between 400°C and 600°C. An exothermic peak was observed at 450°C using our differential scanning calorimeter. We concluded that the reduction of Eu³⁺ and the stabilization of the resultant Eu²⁺ in the glass network takes place at the temperature around 450°C.

URL: http://jjap.jsap.jp/link?JJAP/43/L372/
DOI: 10.1143/JJAP.43.L372

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