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제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Upconversion mechanism in hexagonal structure of NaYF4:Yb3+, Er3+ with various Yb3+ ion concentrations

2016년 2월 18일 16시 36분 13초
MAT.P-432 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 21일 (목요일) 11:00~12:30
저자 및
정종원, GerelkhuuZayakhuu, 이용일*
창원대학교 화학과, Korea
Upconversion (UC) is a process that generates higher energy emission from the low energy of incident light. Many trivalent rare earth ions including Er3+, Tm3+ and Ho3+ are doped in emission and absorption centers in these materials. Recently, the UC phosphors have attracted much attention due to their potential applications in various fields, such as solid-state lasers, solar energy converter, and bio-sensors. Among these applications, considerable attention is devoted for bio-sensor applications. UC phosphors can use near-infrared (NIR) instead of conventional ultraviolet (UV) as an excitation source, which has many advantage such as no reaction with tissues and high quantum efficiency on nanoparticles. The NaYF4 host lattice is well known material as one of the most efficiency host lattices. In this study, we synthesized the Yb3+ and Er3+ co-doped NaYF4 with cubic and hexagonal structures. The UC properties of Yb3+, Er3+ co-doped NaYF4 phosphors were investigated by varying the concentration of Yb3+ ion. We confirmed that the UC luminescence efficiency was enhanced by changing from cubic to hexagonal structure. The morphology of the phosphors shows the spherical and hexagonal prism on cubic and hexagonal structure, respectively. In addition, emission spectra of all phosphors reveal mainly three colors, correspond to blue (2H9/24I15/2), green (2H11/2 and 4S3/24I15/2) transition of Er3+. The Yb3+ and Er3+ co-doped NaYF4 phosphors with hexagonal structure have different properties to the cubic structure. We examined the UC luminescence mechanism in hexagonal structure phosphors using a decay time, pump power dependence and energy level diagram.