Photoluminescence mechanism of carbon dots: triggering high-color-purity red fluorescence emission through edge amino protonation

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Zhang, Qing
Wang, Ruoyu
Feng, Bowen
Zhong, Xiaoxia
Ostrikov, Kostya Ken
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2021
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Abstract

Due to complex structure and surface functionalities, photoluminescence mechanisms of Carbon Dots are unknown, and it is challenging to synthesize Carbon Dots to achieve the desired optical properties. Herein, Carbon Dots simultaneously exhibiting high-color-purity (FWHM~24 nm) long wavelength one-photon fluorescence emission at 620 nm and NIR induced two-photon fluorescence emission at 630 and 680 nm are prepared by edge amino protonation treatment. Systematic analysis reveals that the protonation of 2,3-diaminophenazine changes the molecular state of Carbon Dots, decreases the photon transition band gap, and triggers red fluorescence emission with the dramatically narrowed peak width. As the oxidation products of reactant o-phenylendiamine, the emergence of 2,3-diaminophenazine as a photoluminescence determiner suggests that fluorophore products of precursor conversion are viable determinants of the desired luminescence properties of Carbon Dots. This work shows a new way for predicting and controlling photoluminescence properties of Carbon Dots, and may guide the development of tunable Carbon Dots for a broad range of applications.

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Nature Communications

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12

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1

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© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Nanomaterials

Science & Technology

Multidisciplinary Sciences

Science & Technology - Other Topics

GRAPHENE QUANTUM DOTS

NANOPARTICLES

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Zhang, Q; Wang, R; Feng, B; Zhong, X; Ostrikov, KK, Photoluminescence mechanism of carbon dots: triggering high-color-purity red fluorescence emission through edge amino protonation, Nature Communications, 2021, 12 (1), pp. 6856

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