Anti-Stokes photoluminescence mechanism in graphene quantum dots

Hung-Yu Pan; Chia-Tse Chang; Russel Cruz Sevilla; Ruth Jeane Soebroto; Hsiu-Ying Huang; Chi-Tsu Yuan

doi:10.1117/12.3016972

18 June 2024 Anti-Stokes photoluminescence mechanism in graphene quantum dots

Hung-Yu Pan, Chia-Tse Chang, Russel Cruz Sevilla, Ruth Jeane Soebroto, Hsiu-Ying Huang, Chi-Tsu Yuan

Proceedings Volume 13013, Organic Electronics and Photonics: Fundamentals and Devices IV; 130130A (2024) https://doi.org/10.1117/12.3016972
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

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 (E_HBA) coming from molecular and lattice vibration. Therefore, this study will conclude the mechanism of ASPL.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Hung-Yu Pan, Chia-Tse Chang, Russel Cruz Sevilla, Ruth Jeane Soebroto, Hsiu-Ying Huang, and Chi-Tsu Yuan "Anti-Stokes photoluminescence mechanism in graphene quantum dots", Proc. SPIE 13013, Organic Electronics and Photonics: Fundamentals and Devices IV, 130130A (18 June 2024); https://doi.org/10.1117/12.3016972

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