고해상도 방사선 영상을 위한 Gd2O3:Eu3+ 나노 형광체 제조 및 광학적 특성

Abstract

In this paper, we have synthesized Gd2O3:Eu3+ 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 40nm particle size. From the photoluminescence results, the strong peak exhibits at 611 nm and the luminescent intensity depends on europium concentration. Gd2O3:Eu fine phosphor particle has shown excellent luminescent efficiency at 5 wt% of europium concentration. The phosphors calcinated at 500 have possessed the x-ray peaks corresponding to the cubic phase of Gd2O3. As calcinations temperature increased to 700 , the new monoclinic phase has identified except cubic patterns. From the luminescent decay time measurements, mean lifetimes were 2.3 2.6 ms relatively higher than conventional bulk phosphors. These results indicate that Gd2O3:Eu nano phosphor is possible for the operation at the low x-ray dose, therefore, the application as medical imaging detector.