@article{ART003273916},
author={El-kawy F. S. Abd and Hammad S. and Talaat H. and Bacher G. and Ghali M.},
title={Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer},
journal={Carbon Letters},
issn={1976-4251},
year={2025},
volume={35},
number={5},
pages={2395-2410},
doi={10.1007/s42823-025-00932-4}
TY - JOUR
AU - El-kawy F. S. Abd
AU - Hammad S.
AU - Talaat H.
AU - Bacher G.
AU - Ghali M.
TI - Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer
JO - Carbon Letters
PY - 2025
VL - 35
IS - 5
PB - Korean Carbon Society
SP - 2395
EP - 2410
SN - 1976-4251
AB - The avenue to synthesize eco-friendly and high-performing warm-white light emitting diodes (WLEDs) using quantum-dots for color conversion is challenging. Here, the graphene quantum dots (GQDs) are synthesized from Moringa oleifera leaves without the need of any organic solvents or reducing agents by a one-pot hydrothermal method and utilized for the design of efficient warm WLEDs. The photoluminescence of the obtained GQDs is found to be red-shifted as the excitation wavelength increases. This is ascribed to an excitation of multiple transitions due to various surface traps related to surface amino and oxygen functionalized groups as revealed from X-ray-photoelectron–spectroscopy and FTIR results. Three different concentrations of GQDs are embedded in polyvinyl-alcohol matrix acting as color-converters for the design of WLED devices. By increasing the GQDs concentration, the color correlated temperatures are tuned from 3804 to 2593 K and the luminous efficacy from 39.3 to 71.69 lm/W. Moreover, the chromaticity coordinates of the devices are shifted from (0.3825, 0.3665) to (0.4807, 0.4478). The brightness of the fabricated devices based on these green-GQDs are comparable with those of warm LEDs prepared from chemically synthesized graphene and carbon dots and can be suitable for indoor lighting applications.
KW - Green synthesis;Moringa leaves;Graphene quantum dots;Color conversion;White LEDs
DO - 10.1007/s42823-025-00932-4
ER -
El-kawy F. S. Abd, Hammad S., Talaat H., Bacher G. and Ghali M.. (2025). Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer. Carbon Letters, 35(5), 2395-2410.
El-kawy F. S. Abd, Hammad S., Talaat H., Bacher G. and Ghali M.. 2025, "Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer", Carbon Letters, vol.35, no.5 pp.2395-2410. Available from: doi:10.1007/s42823-025-00932-4
El-kawy F. S. Abd, Hammad S., Talaat H., Bacher G., Ghali M. "Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer" Carbon Letters 35.5 pp.2395-2410 (2025) : 2395.
El-kawy F. S. Abd, Hammad S., Talaat H., Bacher G., Ghali M.. Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer. 2025; 35(5), 2395-2410. Available from: doi:10.1007/s42823-025-00932-4
El-kawy F. S. Abd, Hammad S., Talaat H., Bacher G. and Ghali M.. "Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer" Carbon Letters 35, no.5 (2025) : 2395-2410.doi: 10.1007/s42823-025-00932-4
El-kawy F. S. Abd; Hammad S.; Talaat H.; Bacher G.; Ghali M.. Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer. Carbon Letters, 35(5), 2395-2410. doi: 10.1007/s42823-025-00932-4
El-kawy F. S. Abd; Hammad S.; Talaat H.; Bacher G.; Ghali M.. Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer. Carbon Letters. 2025; 35(5) 2395-2410. doi: 10.1007/s42823-025-00932-4
El-kawy F. S. Abd, Hammad S., Talaat H., Bacher G., Ghali M.. Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer. 2025; 35(5), 2395-2410. Available from: doi:10.1007/s42823-025-00932-4
El-kawy F. S. Abd, Hammad S., Talaat H., Bacher G. and Ghali M.. "Bright white light emitting diodes based on sustainable graphene quantum dots derived from Moringa oleifera leaves as photo-converter layer" Carbon Letters 35, no.5 (2025) : 2395-2410.doi: 10.1007/s42823-025-00932-4
