Carbon dots produced via space-confined vacuum heating: maintaining efficient luminescence in both dispersed and aggregated states

doi:10.1039/c8nh00247a

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	Carbon dots produced via space-confined vacuum heating: maintaining efficient luminescence in both dispersed and aggregated states
	D.Zhou; P.T.Jing; Y.Wang; Y.C.Zhai; D.Li; Y.Xiong; A.V.Baranov
	2019
发表期刊	Nanoscale Horizons
ISSN	2055-6756
卷号	4 期号:2 页码:388-395
摘要	Aggregation-induced quenching (AIQ) of emission is an obstacle for the development of carbon dots (CDots) for solid-state luminescent devices. In this work, we introduce a method to avoid AIQ and to produce highly luminescent CDots through a space-confined vacuum heating synthesis. In the presence of CaCl2, a mixture of citric acid and urea forms an inflated foam under vacuum heating at 120 degrees C. Upon gradually increasing the heating temperature to 250 degrees C, blue emissive molecular species are first formed, and are then transformed into uniform-sized green emissive CDots through dehydration and carbonization processes taking place in the confined ultrathin spaces of the foam walls. The green luminescence of these CDots originates from conjugated sp(2) domains, and these CDots exhibit a high photoluminescence quantum yield (PLQY) of 72% in ethanol solution. Remarkably, due to the existence of only one type of recombination center in these nanoparticles, AIQ does not take place in CDot-based close-packed films, which show strong emission with a PLQY of 65%. Utilizing the differences in the emission properties of vacuum heating produced CDots, CDots synthesized through microwave-assisted heating, and commercial green fluorescent organic ink (namely, excitation-dependent vs. excitation-independent emission, and different stability against photobleaching), multilevel data encryption has been demonstrated.
关键词	graphene quantum dots,light-emitting-diodes,gram-scale synthesis,tunable photoluminescence,nanodots,nitrogen,fluorescent,emission,green,red,Chemistry,Science & Technology - Other Topics,Materials Science
DOI	10.1039/c8nh00247a
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/62734
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	D.Zhou,P.T.Jing,Y.Wang,et al. Carbon dots produced via space-confined vacuum heating: maintaining efficient luminescence in both dispersed and aggregated states[J]. Nanoscale Horizons,2019,4(2):388-395.
APA	D.Zhou.,P.T.Jing.,Y.Wang.,Y.C.Zhai.,D.Li.,...&A.V.Baranov.(2019).Carbon dots produced via space-confined vacuum heating: maintaining efficient luminescence in both dispersed and aggregated states.Nanoscale Horizons,4(2),388-395.
MLA	D.Zhou,et al."Carbon dots produced via space-confined vacuum heating: maintaining efficient luminescence in both dispersed and aggregated states".Nanoscale Horizons 4.2(2019):388-395.

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