Formation of "Steady Size" State for Accurate Size Control of CdSe and CdS Quantum Dots
Formation of "Steady Size" State for Accurate Size Control of CdSe and CdS Quantum Dots
复制标题
形成“稳定尺寸”状态以精确控制 CdSe 和 CdS 量子点的尺寸
DOI：
10.1021/acs.jpclett.7b01238
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发表时间：
2017-08-03
影响因子：
5.7
通讯作者：
Bi, Wengang
中科院分区：
文献类型：
--
作者：
Liu, Xinyue;Liu, Yixuan;Bi, Wengang
We report on the formation of a "steady size" state for the growth of CdSe and CdS quantum dots (QDs), in which the size of the QDs remains constant and independent of reaction time. Kinetic study reveals that this state exists only when certain coordinating ligands are within a range between N-S and N-V + N-S.N-S and N-V represent the number of atoms on the surface of the QDs and the total amount of atoms in the QDs, respectively. Under this condition, the size R of the QDs can be controlled solely by the reaction temperature T with a relationship of I/R-2 similar to T. More importantly, a highly reproducible and accurate linear control of the emission wavelength of QDs on a subnanometer scale by the reaction temperature is achieved. The discovery enables large-scale synthesis of QDs with minimum size variation that meets critical demands on wavelength accuracy for QD-based optoelectronic applications.
