Up-conversion photoluminescence in graphene quantum dots

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

doi:10.1117/12.3016419

18 June 2024 Up-conversion photoluminescence in graphene quantum dots

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

Proceedings Volume 13015, Photosensitive Materials and their Applications III; 1301512 (2024) https://doi.org/10.1117/12.3016419
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Up-conversion photoluminescence (UCPL) is an optical process in which the electrons from ground state absorb lower energy photon (NIR and/or IR) to excite to the excited state and the electrons will return to the ground state while emitting higher energy photon (UV and/or Visible light). However, the occurrence of UCPL in carbon-based nanomaterials was rare to be found. Herein, we provide better understanding and confirmation to the phenomenon of UCPL in graphene quantum dots (GQDs). From excitation-dependent PL measurement, it shows that GQDs have excitation-independent PL emission. Furthermore, the PL emission can still be observed even when it was excited using low energy photons, confirming the phenomenon of UCPL. We performed temperature-dependent PL measurement to further confirm the credibility of UCPL phenomenon. It showed that as increasing temperature, the UCPL intensity grows higher, showing the contribution of phonon in UCPL process. Therefore, we confirm the UCPL phenomenon and due the phonon contribution in the process, we conclude that anti-Stokes photoluminescence (ASPL) is the UCPL process in our materials.

Conference Presentation

Citation Download Citation

Chia-Tse Chang, Hong-Yu Pan, Ruth Jeane Soebroto, Russel Cruz Sevilla, Hsiu-Ying Huang, and Chi-Tsu Yuan "Up-conversion photoluminescence in graphene quantum dots", Proc. SPIE 13015, Photosensitive Materials and their Applications III, 1301512 (18 June 2024); https://doi.org/10.1117/12.3016419

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