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  • 02월 28일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Optical and Magnetic Properties of Self-Doped CdxHg1-xSe Alloy Nanocrystals

2019년 2월 12일 21시 53분 05초
MAT.P-479 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
Material Chemistry
저자 및
Dongsun Choi, Kwang Seob Jeong*
Department of Chemistry, Korea University, Korea
The researches of colloidal quantum dots (CQDs) focused on the bandgap transition for decades. The first steady state mid-IR intraband transition from the mercury system was reported by Jeong et al. in 2014. The recent research has substantiated that the self-doping property leads the intraband transition in the nanocrystal. In this poster, I will present the mid-IR photoluminescence and magnetism of self-doped CdxHg1-xSe alloy nanocrystals. The CdHgSe alloy nanocrystals have the electronic transition progressively shift from visible to the mid-IR localized surface plasmon resonance (LSPR) by increasing the quantity of mercury substitution in the CdSe nanocrystals. The visible emission from nanocrystal is red shifted, and the average lifetime increased as Hg substituent ratio accretion. The further increment of the mercury ratio in the alloy change the major transition to the mid-IR region and successfully measured the mid-IR photoluminescence with the home-built mid-infrared spectrometer. Surprisingly, the mid-IR emissive alloy nanocrystal showed singly-occupied quantum-state from the EPR measurement, and free electron signal as the LSPR revelation, respectively. The photoresponsivity of the fabricated device also confirmed the LSPR development from the alloy nanocrystal. The self-doping study, therefore, gives the novel opportunity to research the change in the electron properties when the material character alters from semiconductors, semi-metals, to metals.