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KMID : 1137820070280010148
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의공학회지
2007 Volume.28 No. 1 p.148 ~ p.152
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Fabrication of $Gd_2O_3:Eu^{3+}$ Nano Phosphor and Optical Characteristics for High Resolution Radiation Imaging
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Kim So-Yeong
Kang Sang-Sik
Park Ji-Koon
Cha Byung-Youl
Choi Chi-Won
Lee Hyung-Won
Nam Sang-Hee
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Abstract
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In this paper, we have synthesized $Gd_2O_3:Eu^{3+}$ nano phosphor particle using a low temperature solution-combustion method. We have investigated the structure and the luminescent characteristic as the sintering temperature and europium concentration. From XRD(X-ray diffraction) and SEM(scanning electron microscope) results, we have verified that the phosphor particle was fabricated a spherical shape with $30{\sim}40nm$ particle size. From the photoluminescence results, the strong peak exhibits at 611 um and the luminescent intensity depends on europium concentration. $Gd_2O_3:Eu$ fine phosphor particle has shown excellent luminescent efficiency at 5 wt% of europium concentration. The phosphors calcinated at $500^{\circ}C$ have possessed the x-ray peaks corresponding to the cubic phase of $Gd_2O_3$. As calcinations temperature increased to $700^{\circ}C$, the new monoclinic phase has identified except cubic patterns. From the luminescent decay time measurements, mean lifetimes were $2.3{\sim}2.6ms$ relatively higher than conventional bulk phosphors. These results indicate that $Gd_2O_3:Eu$ nano phosphor is possible for the operation at the low x-ray dose, therefore, the application as medical imaging detector.
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KEYWORD
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$Gd_2O_3:Eu^{3+}$, low temperature solution-combustion method, nano phosphor, x-ray detector
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