الفهرس 
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Abstract
Nanomaterials (NMs) showed a remarkable breakthrough in LED fabrication recently. One of the significant NPs utilized for photovoltaics, optoelectronics, and in particular, LED devices is Silicon quantum dots (Si QDs) owing to their observable optical characteristics. Several recent researches have been devoted to fabricating the Si QDs chemically, but those methods face the toxicity issue released by chemicals used in the synthesis process. Therefore; the current work introduces an alternative method for Si NPs production that is simple, cheap, and environment-friendly from two agricultural wastes; rice husk (RH) and sugarcane (SCW) waste, using the microwave oven. Additionally, the current research presents, for the first time, the synthesis of gold nanoparticles (Au NPs) from the extract of the same wastes. The two synthesized Si QDs and the two Au NPs served as an active layer to fabricate the LED prototype. Furthermore, the Nickel oxide nanoparticles and Zinc oxide nanoparticles were synthesized to be used as a hole transport layer (HTL) and electron transport layer (ETL). All the fabricated NPs were subjected to structural, morphological, and optical properties investigations via XRD, SEM-EDX, HR-TEM, UV-Vis, FT-IR, and PL emission. The results revealed the formation of high crystalline Si QDs-RH with a mean size of 5 nm and Si QDs-SCW ash with a mean size 7 nm. The absorption spectra results and band gap calculations deduced that the formed SiQDs-RH (Eg= 3.18 eV) and Si QDs-SCW (Eg=3.26 eV) are direct band gap transitions. Furthermore, the two biosynthesized AuNPs using RH and SCW were successfully prepared, exhibiting a spherical shape and size around 15 nm for AuNPs-RH and 25 nm for AuNPs-SCW. The I-V characteristic confirmed good LED behavior with turn-off voltage at 1.5 V and LED emission of at 22 V. the Emission of fabricated LED under fluorescence inverted microscope using red, blue, and green filters emerged different colors on microscope ensures that our LED emits basic three emissions of white light. The results showed promising performance of the eco-friendly synthetized Si QDs in LED device fabrication.