Temperature dependent photoluminescence characteristics in
amino-functionalized graphene quantum dots

J 2026

Temperature dependent photoluminescence characteristics in amino-functionalized graphene quantum dots

ROY, Rajarshi; Inmaculada Jennifer GOMEZ PEREZ; Souvik BHATTACHARJEE; Nilesh MAZUMDER; Subhajit SAHA et al.

Základní údaje

Originální název

Temperature dependent photoluminescence characteristics in amino-functionalized graphene quantum dots

Autoři

ROY, Rajarshi; Inmaculada Jennifer GOMEZ PEREZ; Souvik BHATTACHARJEE; Nilesh MAZUMDER; Subhajit SAHA a Lenka ZAJÍČKOVÁ

Vydání

CARBON, OXFORD, PERGAMON-ELSEVIER SCIENCE LTD, 2026, 0008-6223

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10305 Fluids and plasma physics

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 11.600 v roce 2024

Označené pro přenos do RIV

Ano

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Graphene quantum dots; Photoluminescence; Low-temperature; Varshni model

Štítky

14312020, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 16. 1. 2026 14:55, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Graphene quantum dots (GQDs) have attracted significant attention in the last decade due to its superior tunable luminescence in diverse fields of research including opto-electronics, bio-imaging, drug delivery and catalysis. However, probing the luminescence at low temperatures in such quantum dots has been mostly elusive thus far which provides pivotal information about the bandgap and the nature of electron-phonon interactions widely important for opto-electronic applications. In this work, we establish the temperature dependence of the excitonic bandgap renormalization and electron-phonon coupling in amino-functionalized GQDs of 5-7 nm diameter from the photoluminescence measurements across 76.5-303.1 K by model fitting using different well known theoretical frameworks (Varshni, Vina and Passler models). We have shown that the defect related emission from the hybridized interstate energy level explicitly due to amino-functionalization as a result of n-pi transition violates the relationship associated with the excitonic bandgap renormalization and thereby fails to obey the Varshni model and other associated frameworks (Vina, Passler). Finally, the amino-GQDs showcase distinctive excitonic bandgap shrinkage anomaly and the electron-phonon coupling resulting from the extent of the optical phonon dispersions and phonon damping due to disorder deduced from the fitted model parameters.

Návaznosti

EF18_070/0009846, projekt VaV

Název: MSCAfellow2@MUNI

LM2018121, projekt VaV

Název: Výzkumná infrastruktura RECETOX (Akronym: RECETOX RI)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, RECETOX RI

857560, interní kód MU
(Kód CEP: EF17_043/0009632)

Název: CETOCOEN Excellence (Akronym: CETOCOEN Excellence)

Investor: Evropská unie, CETOCOEN Excellence, Spreading excellence and widening participation

Citovat

ROY, Rajarshi; Inmaculada Jennifer GOMEZ PEREZ; Souvik BHATTACHARJEE; Nilesh MAZUMDER; Subhajit SAHA a Lenka ZAJÍČKOVÁ. Temperature dependent photoluminescence characteristics in amino-functionalized graphene quantum dots. CARBON. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2026, roč. 247, February, s. 1-7. ISSN 0008-6223. Dostupné z: https://doi.org/10.1016/j.carbon.2025.120979.

@article{2547648,
   author = {Roy, Rajarshi and Gomez Perez, Inmaculada Jennifer and Bhattacharjee, Souvik and Mazumder, Nilesh and Saha, Subhajit and Zajíčková, Lenka},
   article_location = {OXFORD},
   article_number = {February},
   doi = {https://doi.org/10.1016/j.carbon.2025.120979},
   keywords = {Graphene quantum dots; Photoluminescence; Low-temperature; Varshni model},
   language = {eng},
   issn = {0008-6223},
   journal = {CARBON},
   title = {Temperature dependent photoluminescence characteristics in amino-functionalized graphene quantum dots},
   url = {https://www.sciencedirect.com/science/article/pii/S0008622325009959},
   volume = {247},
   year = {2026}
}

TY  - JOUR
ID  - 2547648
AU  - Roy, Rajarshi - Gomez Perez, Inmaculada Jennifer - Bhattacharjee, Souvik - Mazumder, Nilesh - Saha, Subhajit - Zajíčková, Lenka
PY  - 2026
TI  - Temperature dependent photoluminescence characteristics in amino-functionalized graphene quantum dots
JF  - CARBON
VL  - 247
IS  - February
SP  - 1-7
EP  - 1-7
PB  - PERGAMON-ELSEVIER SCIENCE LTD
SN  - 00086223
KW  - Graphene quantum dots
KW  - Photoluminescence
KW  - Low-temperature
KW  - Varshni model
UR  - https://www.sciencedirect.com/science/article/pii/S0008622325009959
N2  - Graphene quantum dots (GQDs) have attracted significant attention in the last decade due to its superior tunable luminescence in diverse fields of research including opto-electronics, bio-imaging, drug delivery and catalysis. However, probing the luminescence at low temperatures in such quantum dots has been mostly elusive thus far which provides pivotal information about the bandgap and the nature of electron-phonon interactions widely important for opto-electronic applications. In this work, we establish the temperature dependence of the excitonic bandgap renormalization and electron-phonon coupling in amino-functionalized GQDs of 5-7 nm diameter from the photoluminescence measurements across 76.5-303.1 K by model fitting using different well known theoretical frameworks (Varshni, Vina and Passler models). We have shown that the defect related emission from the hybridized interstate energy level explicitly due to amino-functionalization as a result of n-pi transition violates the relationship associated with the excitonic bandgap renormalization and thereby fails to obey the Varshni model and other associated frameworks (Vina, Passler). Finally, the amino-GQDs showcase distinctive excitonic bandgap shrinkage anomaly and the electron-phonon coupling resulting from the extent of the optical phonon dispersions and phonon damping due to disorder deduced from the fitted model parameters.
ER  -

ROY, Rajarshi; Inmaculada Jennifer GOMEZ PEREZ; Souvik BHATTACHARJEE; Nilesh MAZUMDER; Subhajit SAHA a Lenka ZAJÍČKOVÁ. Temperature dependent photoluminescence characteristics in amino-functionalized graphene quantum dots. \textit{CARBON}. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2026, roč.~247, February, s.~1-7. ISSN~0008-6223. Dostupné z: https://doi.org/10.1016/j.carbon.2025.120979.

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