Laser‐Induced Size‐Focusing Synthesis of High‐Quality Colloidal Quantum Dots
Abstract
Abstract Laser‐assisted chemical synthesis has emerged as a promising toolkit for producing unconventional nanomaterials otherwise not readily accessible. However, it remains challenging for the high‐precision laser‐assisted photoetching of colloidal quantum dots (QDs). Here, we report a laser‐assisted atom‐by‐atom photoetching process that post‐synthetically enables the state‐of‐the‐art colloidal CdSe QDs. By deciphering the surface chemistry and ultrafast excitonic dynamics, we provide an atomic‐level activation–coordination coupling mechanism in such exciton‐involved photochemical reactions. In situ spectroscopies further reveal the reaction kinetics as a four‐step size‐focusing process that is highly dependent on the laser wavelength. As such, by modulating the laser wavelength, which dictates the excitonic absorption threshold of final QDs, we are capable of retrosynthetically programming their sizes across a wide quantum‐confined regime, thereby achieving an ultrabroad color gamut. These findings offer a guideline for the laser‐assisted retrosynthesis of high‐quality quantum‐confined materials.
Article Details
Authors (12)
Yu‐Zhuo Zhang
New Cornerstone Science Laboratory Department of Chemistry Institute of Biomimetic Materials and Chemistry Anhui Engineering Laboratory of Biomimetic Materials Division of Nanomaterials and Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China
Chong Zhang
School of Chemistry
Bo Li
Rui‐Xiang Liu
Chinese Academy of Sciences Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences Chinese Academy of Sciences Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China
Yi‐Da Zhang
National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China
Zhen‐Chao Shao
New Cornerstone Science Laboratory Department of Chemistry Institute of Biomimetic Materials and Chemistry Anhui Engineering Laboratory of Biomimetic Materials Division of Nanomaterials and Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China
Li‐Min Liu
School of Physics Beihang University Beijing China
Guo‐Qiang Liu
New Cornerstone Science Laboratory Department of Chemistry Institute of Biomimetic Materials and Chemistry Anhui Engineering Laboratory of Biomimetic Materials Division of Nanomaterials and Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China
Liang Wu
Xu‐Sheng Zheng
National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China
Yi Li
Shu‐Hong Yu
New Cornerstone Science Laboratory Department of Chemistry Institute of Biomimetic Materials and Chemistry Anhui Engineering Laboratory of Biomimetic Materials Division of Nanomaterials and Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China