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Carbon dots produced: Via space-confined vacuum heating: Maintaining efficient luminescence in both dispersed and aggregated states
Zhou D.1; Jing P.1; Wang Y.2; Zhai Y.1; Li D.1; Xiong Y.3; Baranov A.V.4; Qu S.1,5; Rogach A.L.3,4
2019-03-01
Source PublicationNanoscale Horizons
ISSN20556764 20556756
Volume4Issue:2Pages:388-395
Abstract

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 CaCl , a mixture of citric acid and urea forms an inflated foam under vacuum heating at 120 °C. Upon gradually increasing the heating temperature to 250 °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 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.

DOI10.1039/c8nh00247a
URLView the original
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Materials Science ; Science & Technology - Other Topics
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS IDWOS:000461558200023
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Cited Times [WOS]:6   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Affiliation1.Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences
2.Northwestern University
3.City University of Hong Kong
4.Saint Petersburg National Research University of Information Technologies, Mechanics and Optics University ITMO
5.Universidade de Macau
Recommended Citation
GB/T 7714
Zhou D.,Jing P.,Wang Y.,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 Zhou D..,Jing P..,Wang Y..,Zhai Y..,Li D..,...&Rogach A.L..(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 Zhou D.,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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