Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Method for Generating White Light using WL- GQD
Categories for this Invention
Technology: Generating white light by Graphene quantum dots (WL-GQD)
Category: Quantum Technology & Bioimaging
Industry: Optical and Biotechnology Industry.
Application: Material science, Device fabrication, sensing, and Bio-imaging.
Market: The global market size valued at USD 160 million in 2022 and is anticipated to reach a value of USD 203.9 million by 2030 expanding at a CAGR of 3.2%
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Problem Statement
- Quantum dots are quantum materials with electrons confined in three dimensions (3D).
- They are used in light emitting applications, sensing, and medicine.
- Carbon-based quantum dots (CQD) are cost-effective and have fluorescence properties ranging from UV to NIR.
- Fluorescence quantum yield is crucial in applications like LEDs, bio imaging, and turn-off sensors.
- Fluorescence quantum yield can be improved by doping with components like nitrogen and sulfur.
- Fluorescence emission wavelength can be regulated by changing nano particle size and optical excitation to obtain different colors.
- Conventional methods use harmful acids as precursors, making the fabrication process bio-in_compatible
- There is a need for generating broad white light emission from a single species with biocompatible cost effective percursurs.
Technology
- Mixing a Polycyclic Aromatic Hydrocarbon as a Carbon Precursor and
- A Heteroatoms Co-doping Compound in Deionized (Di) Water to Obtain a Mixture, Wherein the Polycyclic aromatic hydrocarbon Is Naphthalene and the Heteroatoms Co-doping Compound is thiourea;
- Fabricating the Heteroatoms Co-doped Graphene Quantum Dots by
- Performing a Thermal Procedure on the Mixture;
- Obtaining the WL-GQD by drying residue of the fabricated Heteroatoms Co-doped Graphene Quantum Dots and
- Generating the White Light By Using the obtained WL-GQD
Key Features / Value Proposition
Thermal procedure:
- Performed in an autoclave at 180℃ for 8 hours.
Fabrication:
- Stirring 1 gm of naphthalene in 80 ml of concentrated nitric acid for 12 hours.
- Nitration of naphthalene is used to fabricate heteroatoms co-doped graphene quantum dots.
- The dried residue is obtained using solvent acetone and dried to obtain the WL-GQD.
White light formation:
- Generated by dispersing the WL-GQD in dimethylformamide (dmf) and polyvinyl alcohol (pva).
- The heteroatoms co-doping compound includes nitrogen and sulfur doping.
Centrifugation:
- The fabricated heteroatoms co-doped graphene quantum dots are centrifuged at 12000 rpm for 30 minutes.
- Sediment from the centrifuged heteroatoms co-doped graphene quantum dots is filtered and dialyzed for 2 days.
Obtaining NS-GQD:
- The filtered heteroatoms co-doped graphene quantum dots are freeze-dried for a day to obtain NS-GQD
Advantages
- Utilizes environmentally friendly components like polycyclic aromatic hydrocarbon and heteroatoms co-doping compound.
- Wl-gqd is a single carbon quantum dots (CQD), making mass production easy and cost-effective.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Prem B. Bisht
Ultrafast lasers and optical amplifiers
Department of Physics
Intellectual Property
- IITM IDF Ref. 2228
- Patent No: IN 544251
Technology Readiness Level
TRL- 3
Experimental Proof of Concept