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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Light-Induced Modulation of Quantum Dot Conjugate Fluorescence

2018년 8월 23일 16시 46분 01초
MAT2-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 15시 : 20분
Material Chemisty - Frontier of Materials Chemistry: Photosciences
저자 및
Sung Jee Kim
Department of Chemistry, Pohang University of Science and Technology, Korea
Photo-switching or modulation of quantum dots (QDs) can be promising for many fields that include display, memory, and super-resolution imaging. However, such modulations have been mostly relied on photo-modulations of conjugated molecules in QD vicinity which typically require high power of high energy photons at UV. We report a visible light-induced facile modulation route for QD-dye conjugates. QD crystal violets conjugates (QD-CVs) were prepared and the crystal violet (CV) molecules on QD quenched the fluorescence efficiently. The fluorescence of QD-CVs showed a single cycle of emission burst as they go through three stages of (i) initially quenched ‘off’ to (ii) photo-activated ‘on’ as the result of chemical change of CVs induced by photo-electrons from QD and (iii) back to photo-darkened ‘off’ by radical-associated reactions. Multi-color on-demand photo-patterning was demonstrated using QD-CV solid films. QD-CVs were introduced into cells, and excitation with visible light yielded photo-modulation from ‘off’ to ‘on’ and ‘off’ by nearly ten folds. Individual photoluminescence dynamics of QD-CVs was investigated using fluorescence correlation spectroscopy and single QD emission analysis, which revealed temporally-stochastic photo-activations and photo-darkenings. Exploiting the stochastic fluorescence burst of QD-CVs, simultaneous multi-color super-resolution localizations were demonstrated.