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

제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 The Intraband Transition of Less Toxic Self-Doped Metal Chalcogenide Nanocrystal

2019년 2월 14일 14시 14분 13초
PHYS.P-200 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
Physical Chemistry
저자 및
Juhee Son, Dongsun Choi1, Yun Chang Choi1, Kwang Seob Jeong1,*
Chemistry, Korea University, Korea
1Department of Chemistry, Korea University, Korea
For decades, colloidal quantum dots have been in the spotlight as optical materials due to the tunable band gap transition. Due to the quantum confinement effect, continuous states within the band are confined to discrete states. Intraband transition occurring between discrete states of the semiconductor nanocrystal, in principle, should allow many applications in various fields because of their small energy. However, due to the fast hot electron relaxation, it had been very difficult to use the intraband transition. In 2014, the steady-state intraband transition in the mid-IR was first reported by Jeong et al. This is a novel result that opens up the possibilities for using the new electron transition of the colloidal semiconductor nanocrystals, particularly in the mid-IR region. Despite the incredible results, there was a concern in dealing with a toxic reagent such as mercury ion compounds. Thus, there has been a demand for replacement with less-toxic materials. In this poster, I will present the optical properties of silver selenide colloidal quantum dots(CQDs) showing the steady-state intraband transition in the mid-IR. In previous studies, Sahu et al. reported that silver selenide CQDs having absorption around 2000 cm-1, but they incorrectly interpreted it as the band gap transition. Based on our own spectroelectrochemistry and mid-IR emission spectroscopy results, we proved that the mid-IR electronic transition of the silver selenide CQDs arises from the intraband transition. The silver chalcogenides relatively less toxic material will enable many researchers to access to the steady-state intraband transition of the colloidal quantum dot study.