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  • 02월 20일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Up-conversion properties depending on various RE3+ ion concentrations of nanophosphors

2014년 2월 13일 16시 51분 06초
MAT.P-1052 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 16일 (수요일) 16:00~19:00
저자 및
정종원, B.T.Huy, 강지훈, GerelkhuuZayakhuu, 이용일*
창원대학교 화학과, Korea
Nanoparticle materials have been the subject of increased scientific interest, both for fundamental research and for a wide area of application. 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. Er3+, Tm3+and Yb3+doped NaYF4phosphors were prepared bysolvothermal method. The preparation RECl3 solution (RE = Y, Er, Tm and Yb) for various concentration ratio. This rare earth solution (1 mol/L) added 5ml oleic acid (OA) and 15 ml 1-octadecene (ODE). The solution was heated to 160 oC for 30 min and then cooled down to room temperature. Thereafter, 10 ml methanol solution of NH4F (4 mmol) and NaOH (10 mmol) was added dropwise under stirring for 30 min. After methanol evaporated the solution was heated to 300 oC under nitrogen atmosphere and the temperature should be maintained for 1.0 hr, during this procedure the condenser pipe was needed and the stirring speed was about 1,000 rpm. 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).