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Understanding the Photoluminescence Mechanism of Carbon Dots

Published online by Cambridge University Press:  23 June 2017

Zhoufeng Jiang ,
Marta J. Krysmann ,
Antonios Kelarakis ,
Petr Koutnik ,
Pavel Anzenbacher Jr. ,
Paul J. Roland ,
Randy Ellingson  and
Liangfeng Sun
Zhoufeng Jiang
Affiliation:
Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Ohio 43403, USA Center of Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA
Marta J. Krysmann
Affiliation:
Centre for Materials Science, University of Central Lancashire, Preston PR12HE, U.K.
Antonios Kelarakis
Affiliation:
Centre for Materials Science, University of Central Lancashire, Preston PR12HE, U.K.
Petr Koutnik
Affiliation:
Center of Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA
Pavel Anzenbacher Jr.
Affiliation:
Center of Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA
Paul J. Roland
Affiliation:
Department of Physics and Astronomy, Wright Center for Photovoltaic Innovation and Commercialization, School of Solar and Advanced Renewable Energy, University of Toledo, Toledo, Ohio 43606, USA
Randy Ellingson
Affiliation:
Department of Physics and Astronomy, Wright Center for Photovoltaic Innovation and Commercialization, School of Solar and Advanced Renewable Energy, University of Toledo, Toledo, Ohio 43606, USA
Liangfeng Sun*
Affiliation:
Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Ohio 43403, USA Center of Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA
*
‡ (Email: lsun@bgsu.edu)
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Abstract

The carbon dots were investigated to reveal their light-emitting mechanism. The fluorescence spectra of carbon dots show typically two different types of photoluminescence: the excitation-independent component in the short wavelength, and the excitation-dependent component in the longer wavelength. The UV-Vis spectrum of carbon dots shows the absorption maximum of 340 nm which should be accredited to the n-π* transition of the carbonyl group in carbon dots. Absolute quantum yields of carbon dots dispersed in Polyvinyl alcohol is around 15% when the excitation wavelength is less than 425 nm, but decreases continuously when the excitation wavelength increases. The decay lifetimes of the carbon dots also show an abrupt change at excitation wavelength 425 nm. Time resolved photoluminescence was implemented from 31K to 291K to study the photoluminescence decay dynamics of carbon dots, resulting in the continuously decreasing of the lifetime as the temperature increases.

Keywords

absorptionluminescenceenvironmentally benign
Type
Articles
Information
MRS Advances , Volume 2 , Issue 51: Electronic Devices and Materials , 2017 , pp. 2927 - 2934
Copyright
Copyright © Materials Research Society 2017 

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References

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