Ideal CdSe/CdS Core/Shell Nanocrystals Enabled by Entropic Ligands and Their Core Size-, Shell Thickness-, and Ligand-Dependent Photoluminescence Properties

Journal of the American Chemical Society
Jianhai ZhouXiaogang Peng

Abstract

This work explored possibilities to obtain colloidal quantum dots (QDs) with ideal photoluminescence (PL) properties, i.e., monoexponential PL decay dynamics, unity PL quantum yield, ensemble PL spectrum identical to that at the single-dot level, single-dot PL nonblinking, and antibleaching. Using CdSe/CdS core/shell QDs as the model system, shell-epitaxy, ligand exchange, and shape conversion of the core/shell QDs were studied systematically to establish a strategy for reproducibly synthesizing QDs with the targeted properties. The key synthetic parameter during epitaxy was application of entropic ligands, i.e., mixed carboxylate ligands with different hydrocarbon chain length and/or structure. Well-controlled epitaxial shells with certain thickness (∼3-8 monolayers of the CdS shells) were found to be necessary to reach ideal photoluminescence properties, and the size of the core QDs was found to play a critical role in determining both photophysical and photochemical properties of the core/shell QDs. Effects of shape of the core QDs were unnoticeable, and shape of the core/shell QDs only affected photophysical properties quantitatively. Surface ligands, amines versus carboxylates, were important for photochemical properties (...Continue Reading

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Citations

May 24, 2018·Nanoscale·Sushant GhimireVasudevanpillai Biju
Apr 16, 2019·Angewandte Chemie·Jiawei LvZhiyong Tang
Jul 5, 2019·Advanced Materials·Hao-Lin WuLi-Zhu Wu
Nov 22, 2019·Nanotechnology·Jingying LiuQiaoliang Bao
Jun 6, 2019·Nature Communications·Zhenfeng PangXiaogang Peng
Oct 9, 2019·The Journal of Chemical Physics·Gryphon A DrakeMoonsub Shim
Dec 14, 2018·Frontiers in Chemistry·Thulitha M AbeywickramaPreston T Snee
Apr 17, 2019·Nature Communications·Xiaoqi HouXiaogang Peng
May 19, 2020·Angewandte Chemie·Yufei ShuXiaogang Peng
Jan 6, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Sang Yun BangJong Min Kim
Apr 9, 2021·ACS Nano·Alexander L Efros, Louis E Brus
Jun 15, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Roberto SorrentinoUmberto Giovanella
Jul 15, 2021·Nature Communications·Zikang YeXiaogang Peng
Apr 12, 2018·Journal of the American Chemical Society·Jiongzhao LiXiaogang Peng
Jan 31, 2020·Nano Letters·Louis Brus
Jul 30, 2020·ACS Central Science·Zhiyuan CaoXiaogang Peng
Apr 10, 2019·Journal of the American Chemical Society·Yang LiXiaogang Peng
Sep 11, 2019·Journal of the American Chemical Society·Jun ZhangXiaogang Peng
Apr 17, 2020·ACS Applied Materials & Interfaces·Sungwoo KangSeungwu Han
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Feb 12, 2020·Journal of the American Chemical Society·Zhuang HuXiaogang Peng
Nov 2, 2018·The Journal of Physical Chemistry Letters·Zhiyuan Huang, Ming Lee Tang

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