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Insight into the multiple quasi-molecular states in ethylenediamine reduced graphene nanodots

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Abstract

Recently, graphene nanodots (GNDs) have been frequently considered as inherently heterogeneous systems, leading to multicolor emission under a changeable excitation wavelength. However, an accurate picture of the GNDs and an exhaustive structure–property correlation are still lacking. Using a two dimensional photoluminescence excitation (2D-PLE) map, molecular orbital calculation, reduction level dependent PL analysis, absorption spectroscopy and time-resolved PL spectroscopy, three cases of quasi-molecular PL are determined in ethylenediamine (EDA) reduced GNDs, including the C[double bond, length as m-dash]O related electronic state, graphenol related electronic state and large π-conjugated domains. The graphenol structure is expected to be created via nucleophilic addition–elimination reactions between epoxide groups and EDA, contributing most to the blue-shifted and enhanced PL of GNDs. The multiple quasi-molecular PL provides deeper insights into the commonly called “excitation wavelength dependent PL”. An effort is made to utilize the heterogeneous photoluminescence through phosphor-based light-emitting diodes employing reduced GNDs as a phosphor, which are capable of converting blue light into white light.

Graphical abstract: Insight into the multiple quasi-molecular states in ethylenediamine reduced graphene nanodots

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Publication details

The article was received on 30 Aug 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05927B
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Insight into the multiple quasi-molecular states in ethylenediamine reduced graphene nanodots

    W. Zhang, Y. Wang, X. Liu, X. Meng, H. Xu, Y. Xu, B. Liu, X. Fang, H. Li and T. Ding, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP05927B

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