npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2020; 70: 125-130

Published online February 28, 2020 https://doi.org/10.3938/NPSM.70.125

Copyright © New Physics: Sae Mulli.

Formation Mechanism and Luminescence Properties of Carbon Dots for Anti-counterfeiting: Effect of Carbon Source, Reaction Temperature

Woo Tae HONG1, Hyun Kyoung YANG1, Byung Kee MOON*2

1Interdisciplinary Program of LED and Solid State Lighting Engineering, Pukyong National University, Busan 48513, Korea

2Department of physics, Pukyong National University, Busan 48513, Korea

Correspondence to:bkmoon@pknu.ac.kr

Received: November 21, 2019; Revised: December 9, 2019; Accepted: January 2, 2020

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Carbon dots were synthesized using a solvothermal method with various carbon sources and synthesis temperatures. The particle size, surface morphology, and structural and luminescent characteristics was analyzed as functions of the synthesis temperatures. The transmission electron microscope images of the carbon dots showed that the surface morphology of the carbon dots was different for different carbon sources and synthesis temperatures. The Raman spectra of the carbon dots showed that depending on the synthesis conditions, the carbon dots could have an amorphous or a two-dimensional crystalline structure. Under 340-nm excitation, the carbon dots exhibited a dominant blue emission centered at 410 nm. Increasing the synthesis temperature raised the luminescent intensity of the carbon dots due to an increase the number of defect states during a synthesis process at a high temperature. A fluorescent ink for anti-counterfeiting applications was fabricated by using carbon dots and anti-counterfeiting patterns were printed with higher resolution and covertness. Considering these results, we conclude that carbon dots are promising fluorescent materials for was in anti-counterfeiting applications.

Keywords: Carbon dots, Photoluminescence, Anti-counterfeiting

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