세미나 안내

4단계 BK21사업 화학공학혁신리더 교육연구단에서는 아래와 같이 초청 세미나를 개최하고자 하오니,

관심 있는 대학원생과 연구원들의 많은 참석 바랍니다.

Dear All,

You are cordially invited to a seminar by Prof. Moon-Sung Kang (Sogang University)

제 목 (Title): High-resolution Patterning of Colloidal Quantum Dots via Light-driven Ligand Crosslinking

연 사 (Speaker): Prof. Moon-Sung Kang

• Dept. of Chemical and Biomolecular Engineering, Institute of Emergent Materials
• Sogang University

일 시: 2021년 6월 16일 (수) 2:00pm

(Date & Time) Wednesday, June 16, 2:00pm, 2021

장 소: RIST 3동 3326호

(Venue) Room 3326, 3rd Laboratory Building, RIST

초청교수: 화학공학과 노용영 교수 (Tel. 279-2265)

(Inquiry) Prof. Yong-Young Noh (Tel. 279-2265)

Abstract:

To fully exploit the excellent luminescence characteristics of quantum dots (QDs), researches on EL displays based on QDs have been actively conducted. To achieve this, a multi-color QD patterning technology must be established. Processing and patterning of quantum dots involve a solution-based technique, unlike the organic light emitting materials which are typically deposited through evaporation-based technique. The applicability of QDs to various solution process allows one to carry out their deposition over a large-scale at low cost, but it also causes a problem of dissolving the bottom layer if the secondary layer is applied by solution process consecutively. Here we report a simple way to obtain high-resolution patterns of QDs using a chemical crosslinker (bis-perfluorophenyl azide) that can bind to ligands surrounding the QD surface to form a bridging network upon exposure to UV, which is referred to as the light-driven ligand crosslinker (LiXer).^[1] Due to the chemical durability of the cross-linked QDs, non-crosslinked portions can be etched chemically to form high resolution (<3 μm) patterns of QDs. Multi-color patterns can also be stacked laterally or vertically by repeating the same solution process. The EL characteristics of the cross-linked QDs varied systematically with the loading of the LiXer. The optimal loading of the LiXer yielded the cross-linked QDs with EL characteristics comparable to those of pristine QDs. The simple strategy converting the QD films to be photo-resistive will make significant impact enabling the production of high-resolution, high-throughput, full-color EL displays based on QDs intensively explored in the community.

※ 본 세미나는 코로나19 방역 수칙을 준수하여 개최할 예정입니다.