研究目的
To obtain uniform blue-green emissive GQDs and modified efficient orange-emitting graphene quantum dots (D-GQDs) derived from fullerene (C60) under acid-free condition for applications in white LEDs.
研究成果
The study successfully synthesized high-efficiency orange emissive D-GQDs with a quantum yield of 52.4% and demonstrated their application in white LEDs. The luminescent films showed excellent flexibility and white emission properties, meeting commercial requirements.
研究不足
The study focuses on the synthesis and optical properties of GQDs and D-GQDs, but the scalability of the synthesis method and the long-term stability of the luminescent films under operational conditions are not extensively discussed.
1：Experimental Design and Method Selection:
The GQDs were synthesized via a persulfate-assisted one-step redox method to open C60 under acid-free conditions. D-GQDs were prepared by modifying GQDs with 2,3-diaminonaphthalene (DAN).
2：Sample Selection and Data Sources:
Fullerene (C60) was used as the raw material.
3：List of Experimental Equipment and Materials:
Equipment includes JEOL JEM-2100F electron microscope, SPM-3100 microscope, ESCALAB 250 spectrometer, Edinburgh FLS980 spectrofluorometer, Nicollet 380 infrared spectrophotometer, Renishaw inVia Raman spectrometer, NETZSCH STA 449C analyzer, Kratos Axis Ultra DLD system. Materials include C60, potassium monopersulfate (oxone), N,N-dimethylformamide (DMF), poly(vinyl alcohol) (PVA).
4：Experimental Procedures and Operational Workflow:
GQDs were synthesized by reacting C60 with oxone in DMF under solvothermal conditions. D-GQDs were prepared by reacting GQDs with DAN. Luminescent films were prepared by blending GQDs and D-GQDs with PVA.
5：Data Analysis Methods:
The quantum yield was measured using quinine sulfate as the standard. PL spectra, time-resolved decay lifetimes, and other optical properties were characterized using the mentioned equipment.
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JEOL JEM-2100F electron microscope
JEM-2100F
JEOL
Transmission electron microscopy imaging
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Edinburgh FLS980 spectrofluorometer
FLS980
Edinburgh
Photoluminescence spectra and time-resolved decay lifetimes characterization
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Kratos Axis Ultra DLD system
Axis Ultra DLD
Kratos
Ultraviolet photoelectron spectra recording
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SPM-3100 microscope
SPM-3100
Atomic force microscopy imaging
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ESCALAB 250 spectrometer
ESCALAB 250
X-ray photoelectron spectroscopy
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Nicollet 380 infrared spectrophotometer
380
Nicollet
FT-IR spectra recording
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Renishaw inVia Raman spectrometer
inVia
Renishaw
Raman spectroscopy
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NETZSCH STA 449C analyzer
STA 449C
NETZSCH
Thermal gravimetric analysis
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