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Photoluminescence enhancement of organic dye by graphene quantum dots

Photoluminescence enhancement of organic dye by graphene quantum dots
Photoluminescence enhancement of organic dye by graphene quantum dots

The charge transfer (CT) interaction between the blue emitting graphene quantum dots (GQDs) and an organic dye (fluorescein 27, F27) has been first studied by steady-state and time-resolved spectroscopy as a function of the pH. F27 exists in the form of different inherent fluorescent species depending on the pH of the solvent. At pH 7, the CT interaction of GQDs with F27 results in a small red shift in the absorption and fluorescence spectra of the dye. The results indicate formation of a weak van der Waals (vdW) complex in the ground state. The photoluminescence decay rate of the GQDs is generally unaffected in the mixture indicating the absence of dynamic quenching. The fluorescence intensity of F27-GQD system shows a 3-fold increase. Numerical simulations reveal that apart from the CT interaction, hotspots in the nearfield of the GQDs contribute to the fluorescence enhancement.

Charge transfer, Graphene quantum dots, Laser dye, Photoluminescence enhancement
1010-6030
Sagar, Vijay Kumar
59952d16-876e-4d1f-a712-6cf4797c45b9
Veluthandath, Aneesh Vincent
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Bisht, Prem Ballabh
9e617371-071b-48b1-9f33-2801ea08cace
Sagar, Vijay Kumar
59952d16-876e-4d1f-a712-6cf4797c45b9
Veluthandath, Aneesh Vincent
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Bisht, Prem Ballabh
9e617371-071b-48b1-9f33-2801ea08cace

Sagar, Vijay Kumar, Veluthandath, Aneesh Vincent and Bisht, Prem Ballabh (2020) Photoluminescence enhancement of organic dye by graphene quantum dots. Journal of Photochemistry and Photobiology A: Chemistry, 400, [112614]. (doi:10.1016/j.jphotochem.2020.112614).

Record type: Article

Abstract

The charge transfer (CT) interaction between the blue emitting graphene quantum dots (GQDs) and an organic dye (fluorescein 27, F27) has been first studied by steady-state and time-resolved spectroscopy as a function of the pH. F27 exists in the form of different inherent fluorescent species depending on the pH of the solvent. At pH 7, the CT interaction of GQDs with F27 results in a small red shift in the absorption and fluorescence spectra of the dye. The results indicate formation of a weak van der Waals (vdW) complex in the ground state. The photoluminescence decay rate of the GQDs is generally unaffected in the mixture indicating the absence of dynamic quenching. The fluorescence intensity of F27-GQD system shows a 3-fold increase. Numerical simulations reveal that apart from the CT interaction, hotspots in the nearfield of the GQDs contribute to the fluorescence enhancement.

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More information

Accepted/In Press date: 4 May 2020
e-pub ahead of print date: 20 May 2020
Published date: 1 September 2020
Keywords: Charge transfer, Graphene quantum dots, Laser dye, Photoluminescence enhancement

Identifiers

Local EPrints ID: 445115
URI: http://eprints.soton.ac.uk/id/eprint/445115
ISSN: 1010-6030
PURE UUID: 161a5fb2-ed7d-4a50-be32-914b428c64cb
ORCID for Aneesh Vincent Veluthandath: ORCID iD orcid.org/0000-0003-4306-6723

Catalogue record

Date deposited: 19 Nov 2020 17:33
Last modified: 20 Feb 2021 02:59

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