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제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effect of Tetragonal to Cubic Phase Transition on the Upconversion Luminescence Properties of A/B site Erbium-doped Perovskite BaTiO3

등록일
2019년 1월 24일 11시 08분 40초
접수번호
2803
발표코드
PHYS.P-87 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 19일 (금요일) 11:00~12:30
발표형식
포스터
발표분야
Physical Chemistry
저자 및
공동저자
Hyeongyu Bae, Kang Taek Lee1,*
Department of Chemistry, Gwangju Institute of Science and Technology, Korea
1Division of Physical Chemistry Department of Chemi, Gwangju Institute of Science and Technology, Korea
Along with the growing number of applications of upconversion materials, the more thorough understanding of their intrinsic mechanisms for the optical processes are required. Thus far, various lanthanides have been investigated and they are considered the representative upconversion system owing to the huge advantage as the optical probes. When it comes to the upconversion energetics and the associated upconversion paths, the role of the host materials is very important, because they provide microscopic environments, in other words, unique lattice structure of the crystalline samples. Generally, the upconversion quantum efficiency is very low (< 1 %) due to the weak transition dipole moment in the 4f-4f forbidden transition. The low quantum yield can be overcome by adjusting the composition of the lanthanide ions and by varying the types of host materials. In this poster, we reported our remarkable finding that the host material, barium titanate (BaTiO3, BT), the upconversion luminescence efficiency changed as a function of temperature (65 – 155 ℃). This was attributed to the phase transition from tetragonal to cubic structures of BT, which was corroborated by high-temperature XRD (X-ray diffraction) measurements. XRD analysis revealed that the high-yield formation of tetragonal barium titanates at room temperature and the phase transition of BT at ~120oC. Furthermore, it turns out that the temperature dependent upconversion luminescence depended on the sites of doping of Er3+ at A (Ba2+) or B (Ti4+) in barium titanate, which was explained in terms of symmetry of crystal structure surrounding the Er3+ ions.

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