7 - 11 April 2024
Strasbourg, France
Conference 13013 > Paper 13013-50
Paper 13013-50

Anti-Stokes photoluminescence mechanism in graphene quantum dots

On demand | Presented live 10 April 2024

Abstract

Graphene quantum dots (GQDs) are one kind of carbon-based nanomaterials which can be used for numerous applications, such as energy conservation, luminescent solar concentrators, bioimaging, and biosensing. It has low toxicity, high conductivity and it shows exceptional optical properties, including photoluminescence (PL) emission which could be adjusted from blue to red emission depending on the solvent. Another interesting properties found in GQDs is anti-Stokes photoluminescence (ASPL). However, the mechanism of ASPL in GQDs was still unclear. In this study, GQDs were prepared with 1,3,6-trinitropyrene as the precursor, then dissolved in toluene (GQDs@TL). The results show that GQDs@TL has PL emission peak at ~595 nm when excited at ~530 nm and ~700 nm. It showed that GQDs@TL has large energy gain (~310 meV). To further understand the mechanism of ASPL, additional temperature-dependent measurements were done. We found that the large energy gain could be gained owing to the contribution of phonon energy and hot-band absorption energy (EHBA) coming from molecular and lattice vibration. Therefore, this study will conclude the mechanism of ASPL.

Presenter

Hung-Yu Pan
Chung Yuan Christian Univ. (Taiwan)
My name is Hung-Yu, Pan. I am 26 years old. I am a person who likes to be knowledgeable in every aspect and I like to work in a team. Currently, I am pursuing my master degree education in the department of physics at Chung Yuan Christian University. I was graduated from the same university and department back in 2019 for my bachelor degree. During these years, I learnt and became knowledgeable in the field of optics and semiconductor physics. My research topic and interest are mainly about describing the optical properties of luminescent materials and semiconductor materials.
Application tracks: Sustainability
Presenter/Author
Hung-Yu Pan
Chung Yuan Christian Univ. (Taiwan)
Author
Chia-Tse Chang
Chung Yuan Christian Univ. (Taiwan)
Author
Russel Cruz Sevilla
Research Ctr. for Semiconductor Materials and Advanced Optics, Chung Yuan Christian Univ. (Taiwan)
Author
Ruth Jeane Soebroto
Research Ctr. for Semiconductor Materials and Advanced Optics, Chung Yuan Christian Univ. (Taiwan)
Author
Research Ctr. for Semiconductor Materials and Advanced Optics, Chung Yuan Christian Univ. (Taiwan)
Author
Research Ctr. for Semiconductor Materials and Advanced Optics, Chung Yuan Christian Univ. (Taiwan)