Thermoluminescent Properties of Tridymite SiO2 : Al3+, Eu3+ |
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Authors: | M. Ohta M. Takami |
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Affiliation: | (1) Department of Material Science and Technology, Faculty of Engineering, Niigata University, 8050, Igarashi 2-no-cho, Niigata, 950-2181, Japan;(2) Graduate School of Science and Technology, Niigata University, 8050, Igarashi 2-no-cho, Niigata, 950-2181, Japan |
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Abstract: | SiO2 crystals have been used in electroluminescence devices and thermoluminescence (TL) dosimeters. However, their emission mechanisms have not yet been clearly explained. Recently, it has become possible to obtain amorphous, highly pure, SiO2 prepared by the sol-gel method. The emission mechanism of TL was investigated using Al3+ and/or Eu3+-doped SiO2 crystalline samples prepared by heat-treating under much lower temperature than the melting point of SiO2. The TL spectrum of Eu3+-doped sample had main peaks due to the electron transitions from 5D2 to 7F5 (ca. 570 nm, yellow peak) and from 5D0 to 7F2 (ca. 610 nm, red peak). The yellow peak intensity has a maximum value in the SiO2 doped with near 1 mmol% of Eu2O3, while the red peak intensity was almost constant. These facts suggest that bright yellow emission of SiO2TL phosphor is synthesized by the diffusion of Eu3+ ion in SiO2 matrix prepared by sol-gel method. |
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Keywords: | SiO2 sol-gel thermoluminescence ESR Eu3+ |
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