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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Hydrothermal synthesis and luminescence properties of NaYF4:Yb/Er upconversion phosphor under various synthesis conditions

2014년 8월 28일 16시 30분 51초
MAT.P-1141 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
정종원, B.T.Huy, GerelkhuuZayakhuu, 이용일*
창원대학교 화학과, Korea
Abstract Up-conversion luminescent materials with anti-Stoke optical properties have received considerable attention due to their potential applications in luminescent nanodevices including flat panel displays, solid state lasers, optical fiber based telecommunications and solar cells. Recently, the attention of the nonscientists has been focusing more and more on biological applications. The up-conversion nanoparticles (UCNPs) have many good characteristics. The main materials are that they can emit visible or near infrared (NIR) light under NIR irradiation. In addition, these UCNPs show a sharp emission bandwidth, high photostability, tunable emission, long lifetime, and low cytotoxicity. These benefits make the UCNPs can be used as probes for intravital imaging which enables the investigation of physiological processes within the context of a living organism, and provides a more complete picture of disease pathology and development. NaYF4:Yb/Er phosphors were prepared by hydrothermal method. The preparation RECl3 and RE(NO3)3 (RE = Y, Er, and Yb) solutions. And various capping agent solution (malonic acid, olecic acid and EDTA) prepared at room-temperature. The selection of an appropriate capping agent is one of the key issues for preparing carboxyl-functionalized upconversion phosphors with controlled phase, size, and shape. And the 10 ml water solution of NH4F (4 mmol) and NaOH (4 mmol) was added capping agent solution and RE(NO3)3 solution dropwise under stirring for 1 hr. This solution put in the autoclave system running various temperatures (200, 240, 260, 280, and 300 oC) for 3 hr. The resulting nanoparticles were precipitated by the addition of ethanol, collected by centrifugation washed with ethanol several times. Their crystalline structures, surface morphologies and phase transitions were investigated according to annealing process by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL).