Narrowing the Photoluminescence of Aqueous CdTe Quantum Dots via Ostwald Ripening Suppression Realized by Programmed Dropwise Precursor Addition

doi:10.1021/acs.jpcc.8b01053

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	Narrowing the Photoluminescence of Aqueous CdTe Quantum Dots via Ostwald Ripening Suppression Realized by Programmed Dropwise Precursor Addition
	Huang, Xiaodan 1,2; Jing, Lihong 1,2; Kershaw, Stephen V.3,4; Wei, Xiaojun 1,2; Ning, Haoran 1,2; Sun, Xiaodan 1,2; Rogach, Andrey L.3,4; Gao, Mingyuan 1,2
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2018-05-24
卷号	122 期号:20 页码:11109-11118
ISSN号	1932-7447
DOI	10.1021/acs.jpcc.8b01053
英文摘要	Ostwald ripening is the dominant particle growth mechanism in traditional routes to synthesize aqueous CdTe quantum dots (QDs), which results in a broadening of their size distribution and also their photoluminescence line width, in the case of prolonged reactions. We introduce a method to suppress the Ostwald ripening through the replenishment of precursors before size defocusing occurs in the aqueous synthetic system, which is realized through a programmed dropwise precursor (source) addition (denoted as PDPA) by a syringe pump arrangement that can control the prcursor feed volume and rate. As a result, we have obtained a series of highly monodisperse CdTe QDs, with the emission full width at half-maximum in the red region (106 meV) being even narrower than that in the green region (160 meV). We monitored the conductivity of the reaction solution to follow the consumption of precursors, providing feedback as to whether the replenishment volume was matched. Correlations between the emission quantum yield and the fluorescence lifetime for different precursor source addition rates are provided. The influence of the respective sizes of the CdTe particles employed as precursors in PDPA on the growth rate, monodispersity, and emission characteristics of the resulting QDs is explored, and the underlying mechanisms are rationalized.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000433403400047
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/42871]
专题	中国科学院化学研究所
通讯作者	Jing, Lihong; Rogach, Andrey L.; Gao, Mingyuan
作者单位	1.Chinese Acad Sci, Inst Chem, Key Lab Colloid Interface & Chem Thermodynam, Bei Yi Jie 2, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China 3.City Univ Hong Kong, Dept Mat Sci & Engn, 83 Tat Chee Ave, Kowloon, Hong Kong, Peoples R China 4.City Univ Hong Kong, Ctr Funct Photon, 83 Tat Chee Ave, Kowloon, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Huang, Xiaodan,Jing, Lihong,Kershaw, Stephen V.,et al. Narrowing the Photoluminescence of Aqueous CdTe Quantum Dots via Ostwald Ripening Suppression Realized by Programmed Dropwise Precursor Addition[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2018,122(20):11109-11118.
APA	Huang, Xiaodan.,Jing, Lihong.,Kershaw, Stephen V..,Wei, Xiaojun.,Ning, Haoran.,...&Gao, Mingyuan.(2018).Narrowing the Photoluminescence of Aqueous CdTe Quantum Dots via Ostwald Ripening Suppression Realized by Programmed Dropwise Precursor Addition.JOURNAL OF PHYSICAL CHEMISTRY C,122(20),11109-11118.
MLA	Huang, Xiaodan,et al."Narrowing the Photoluminescence of Aqueous CdTe Quantum Dots via Ostwald Ripening Suppression Realized by Programmed Dropwise Precursor Addition".JOURNAL OF PHYSICAL CHEMISTRY C 122.20(2018):11109-11118.