研究目的
To address the aggregation-caused quenching (ACQ) effect in carbon quantum dots (CQDs) and their single-peak emission limitation for application in white light-emitting diodes (WLED) by developing a one-step solvothermal method to prepare a stable solid-state CQDs with multi-peak emission.
研究成果
The one-step solvothermal method successfully prepared solid-state fluorescent CQDs/PC with multi-peak emission, effectively reducing the ACQ effect. The CQDs/PC exhibited good thermal stability and was used to fabricate a WLED with a high color-rendering index (82) and a correlated color temperature of 5430 K, demonstrating its potential application in the lighting field.
研究不足
The study focuses on the preparation and initial application of CQDs/PC in WLEDs, but the long-term stability and scalability of the method for industrial applications are not discussed. The quantum yield of CQDs/PC is relatively low (20.3%), which may limit its efficiency in some applications.
1：Experimental Design and Method Selection:
A one-step solvothermal method was used to synthesize a complex of CQDs and phthalimide crystals (CQDs/PC) to prevent the ACQ effect by embedding CQDs in phthalimide crystal matrix in situ.
2：Sample Selection and Data Sources:
Phthalic acid and formamide were used as raw materials.
3：List of Experimental Equipment and Materials:
Teflon stainless steel autoclave, organic filtration membrane (
4：22 μm), JEOL JEM-2010 for TEM and HRTEM, Bruker Tensor 27 spectrometer for FTIR, Rigaku-D/MAX 2500 diffractometer for XRD, Horiba Fluoromax-4 fluorescence spectrophotometer for PL spectra, Setaram Labsys Evo TG analyzer for TG analysis, integrating sphere for QY measurement, Kratos AXIS ULTRA DLD X-ray photoelectron spectrometer for XPS, F-star photoelectric testing system for WLED devices testing. Experimental Procedures and Operational Workflow:
Phthalic acid was dissolved in a mixed solvent of formamide and glycerol, reacted in an autoclave at 453 K for 4 h, filtered, dried, and ground to obtain CQDs/PC.
5：Data Analysis Methods:
The structure and composition were analyzed by FTIR, XRD, TEM, HRTEM, XPS; optical properties by PL spectra; thermal stability by TG analysis; and WLED performance by photoelectric testing system.
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Transmission electron microscopy
JEOL JEM-2010
JEOL
Used for obtaining TEM and HRTEM images of CQDs/PC phosphor.
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Fourier-transform infrared spectrometer
Bruker Tensor 27
Bruker
Used for obtaining FTIR spectra of the samples.
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X-ray diffractometer
Rigaku-D/MAX 2500
Rigaku
Used for measuring the XRD pattern of the CQDs/PC.
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X-ray photoelectron spectrometer
Kratos AXIS ULTRA DLD
Kratos
Used for conducting XPS measurement.
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Teflon stainless steel autoclave
40 mL
Used for solvothermal synthesis of CQDs/PC.
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organic filtration membrane
0.22 μm
Used for filtering the solid–liquid mixture product.
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fluorescence spectrophotometer
Horiba Fluoromax-4
Horiba
Used for recording PL spectra.
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thermogravimetric analyzer
Setaram Labsys Evo TG
Setaram
Used for characterizing the TG curve of CQDs/PC.
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integrating sphere
Used for measuring the absolute QY of CQDs/PC phosphor.
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photoelectric testing system
F-star
Used for testing WLED devices.
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