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90 results on '"Woo， Ju Young"'

4. Tip-induced strain, bandgap, and radiative decay engineering of a single metal halide perovskite quantum dot

Author

Lee, Hyeongwoo, Woo, Ju Young, Park, Dae Young, Jo, Inho, Park, Jusun, Lee, Yeunhee, Koo, Yeonjeong, Choi, Jinseong, Kim, Hyojung, Kim, Yong-Hyun, Jeong, Mun Seok, Jeong, Sohee, and Park, Kyoung-Duck

Subjects
Physics - Applied Physics
Abstract

Strain engineering of perovskite quantum dots (pQDs) enables widely-tunable photonic device applications. However, manipulation at the single-emitter level has never been attempted. Here, we present a tip-induced control approach combined with tip-enhanced photoluminescence (TEPL) spectroscopy to engineer strain, bandgap, and emission quantum yield of a single pQD. Single CsPbBr$_{x}$I$_{3-x}$ pQDs are clearly resolved through hyperspectral TEPL imaging with $\sim$10 nm spatial resolution. The plasmonic tip then directly applies pressure to a single pQD to facilitate a bandgap shift up to $\sim$62 meV with Purcell-enhanced PL quantum yield as high as $\sim$10$^5$ for the strain-induced pQD. Furthermore, by systematically modulating the tip-induced compressive strain of a single pQD, we achieve dynamical bandgap engineering in a reversible manner. In addition, we facilitate the quantum dot coupling for a pQD ensemble with $\sim$0.8 GPa tip pressure at the nanoscale. Our approach presents a new strategy to tune the nano-opto-electro-mechanical properties of pQDs at the single-crystal level.

Published
2021

9. White‐Color Generation Using Blue Top‐Emission Organic Light‐Emitting Diode and Nanocrystalline Materials.

Author

Moon, Jaehyun, Lee, Ju-Hun, Park, Jusun, Joo, Chul Woong, Ahn, Dae-Hyun, Kim, Joo Yeon, Woo, Ju Young, and Kang, Seung-Youl

Subjects
LIGHT emitting diodes, ORGANIC light emitting diodes, COLOR temperature, NANOCRYSTALS, PEROVSKITE
Abstract

White light is of great technical interest in many photonic applications. In this work, colloidal solutions containing mutually immiscible green perovskite nanocrystals and red InP quantum dots are developed as color‐conversion (CC) materials for generating white light. By combining the green/red CC materials and a blue top‐emission organic light‐emitting diode as an excitation source, it is possible to generate white light with a range of color temperatures (CTs). The technical approach can be extended to a wide variety of photonic applications where controllable CT is desirable. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Tip-Induced Strain Engineering of a Single Metal Halide Perovskite Quantum Dot

Author

Lee, Hyeongwoo, primary, Woo, Ju Young, additional, Park, Dae Young, additional, Jo, Inho, additional, Park, Jusun, additional, Lee, Yeunhee, additional, Koo, Yeonjeong, additional, Choi, Jinseong, additional, Kim, Hyojung, additional, Kim, Yong-Hyun, additional, Jeong, Mun Seok, additional, Jeong, Sohee, additional, and Park, Kyoung-Duck, additional

Published
2021
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45. Role of Surface States in Photocatalysis: Study of Chlorine-Passivated CdSe Nanocrystals for Photocatalytic Hydrogen Generation

Author

Kim, Whi Dong, primary, Kim, Ji-Hee, additional, Lee, Sooho, additional, Lee, Seokwon, additional, Woo, Ju Young, additional, Lee, Kangha, additional, Chae, Weon-Sik, additional, Jeong, Sohee, additional, Bae, Wan Ki, additional, McGuire, John A., additional, Moon, Jun Hyuk, additional, Jeong, Mun Seok, additional, and Lee, Doh C., additional

Published
2016
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