@article{ART003241484},
author={Mishra Shiv Rag and Mandal Tuhin and Senapati Rabi Narayan and Singh Vikram},
title={White-light emitting self-assembled graphene quantum dots from coal soot},
journal={Carbon Letters},
issn={1976-4251},
year={2025},
volume={35},
number={3},
pages={1067-1079},
doi={10.1007/s42823-025-00860-3}
TY - JOUR
AU - Mishra Shiv Rag
AU - Mandal Tuhin
AU - Senapati Rabi Narayan
AU - Singh Vikram
TI - White-light emitting self-assembled graphene quantum dots from coal soot
JO - Carbon Letters
PY - 2025
VL - 35
IS - 3
PB - Korean Carbon Society
SP - 1067
EP - 1079
SN - 1976-4251
AB - Graphene quantum dots have recently gained significant attention for their potential application in the development of optoelectronic materials. The present study focused on the ultrasonic method to synthesize white-light-emitting graphene quantum dots from coal soot in just 2 min at room temperature. The white-light emission was achieved in solution and polymeric film with good Commission Internationale del’Eclairage index (0.28, 0.33) and (0.25, 0.30), respectively. The graphene quantum dots cover a significant fraction of the visible region in the emission spectrum with two prominent bands at 475 and 635 nm at 380 nm photoexcitation, corresponding to monomer and J-aggregate emission. The strong reducing and basic nature of the ethylene diamine facilitated the preparation of self-assembled J-aggregate graphene quantum dots through hydrogen bonding and electrostatic interaction. The mechanism of origin J-aggregate emission in the prepared graphene quantum dots was studied using UV–visible absorption, steady-state, lifetime fluorescence spectroscopy, and zeta potential. The as-synthesized graphene quantum dots are successfully coated on the UV-LEDs' surface and emit white light on the applied voltage. The colours of red, green, blue, and yellow balls appear significantly in the lighting of prepared white LEDs.
KW - Coal soot;Graphene quantum dots;Ethylene diamine;J-aggregate;Ultrasonication treatment;White-light emission
DO - 10.1007/s42823-025-00860-3
ER -
Mishra Shiv Rag, Mandal Tuhin, Senapati Rabi Narayan and Singh Vikram. (2025). White-light emitting self-assembled graphene quantum dots from coal soot. Carbon Letters, 35(3), 1067-1079.
Mishra Shiv Rag, Mandal Tuhin, Senapati Rabi Narayan and Singh Vikram. 2025, "White-light emitting self-assembled graphene quantum dots from coal soot", Carbon Letters, vol.35, no.3 pp.1067-1079. Available from: doi:10.1007/s42823-025-00860-3
Mishra Shiv Rag, Mandal Tuhin, Senapati Rabi Narayan, Singh Vikram "White-light emitting self-assembled graphene quantum dots from coal soot" Carbon Letters 35.3 pp.1067-1079 (2025) : 1067.
Mishra Shiv Rag, Mandal Tuhin, Senapati Rabi Narayan, Singh Vikram. White-light emitting self-assembled graphene quantum dots from coal soot. 2025; 35(3), 1067-1079. Available from: doi:10.1007/s42823-025-00860-3
Mishra Shiv Rag, Mandal Tuhin, Senapati Rabi Narayan and Singh Vikram. "White-light emitting self-assembled graphene quantum dots from coal soot" Carbon Letters 35, no.3 (2025) : 1067-1079.doi: 10.1007/s42823-025-00860-3
Mishra Shiv Rag; Mandal Tuhin; Senapati Rabi Narayan; Singh Vikram. White-light emitting self-assembled graphene quantum dots from coal soot. Carbon Letters, 35(3), 1067-1079. doi: 10.1007/s42823-025-00860-3
Mishra Shiv Rag; Mandal Tuhin; Senapati Rabi Narayan; Singh Vikram. White-light emitting self-assembled graphene quantum dots from coal soot. Carbon Letters. 2025; 35(3) 1067-1079. doi: 10.1007/s42823-025-00860-3
Mishra Shiv Rag, Mandal Tuhin, Senapati Rabi Narayan, Singh Vikram. White-light emitting self-assembled graphene quantum dots from coal soot. 2025; 35(3), 1067-1079. Available from: doi:10.1007/s42823-025-00860-3
Mishra Shiv Rag, Mandal Tuhin, Senapati Rabi Narayan and Singh Vikram. "White-light emitting self-assembled graphene quantum dots from coal soot" Carbon Letters 35, no.3 (2025) : 1067-1079.doi: 10.1007/s42823-025-00860-3
