研究目的
Investigating the use of nitrogen-doped carbon dots (N-CDots) as color conversion layers in white-LED configurations to generate white light with improved properties.
研究成果
The study demonstrated that N-CDots can be effectively used as color conversion layers in white-LED configurations, offering a promising alternative to inorganic phosphors. The integration of commercial red phosphor and the use of electrospun composite fibers improved the white-light properties, achieving high CRI and low CCT values.
研究不足
The study notes aggregation-induced luminescence quenching (AILQ) and enhanced scattering as limitations when increasing the amount of N-CDots, which reduces the PL intensity and luminous flux.
1：Experimental Design and Method Selection:
The study involved the synthesis of green-emitting nitrogen-doped carbon dots (N-CDots) and their incorporation into drop-cast composite films and polymer/N-CDot composite fibers for use as color conversion layers in white-LED configurations.
2：Sample Selection and Data Sources:
The N-CDots were synthesized using diammonium hydrogen citrate and urea. Commercial red phosphor was integrated to address red deficiency.
3：List of Experimental Equipment and Materials:
High-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), photoluminescence (PL) and absorbance measurements, scanning electron microscopy (SEM), and a commercial blue LED chip were used.
4：Experimental Procedures and Operational Workflow:
The N-CDots were synthesized, purified, and dispersed in distilled water. Composite films and fibers were prepared and characterized. The white-light properties were evaluated.
5：Data Analysis Methods:
The optical properties such as CRI, CCT, LER, and luminous flux were calculated using the OSRAM ColorCalculator program.
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High-resolution transmission electron microscopy
JEOL 2100F
JEOL
Examine the morphology of the N-CDots
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X-ray photoelectron spectroscopy
Thermo Scientific K-Alpha
Thermo Scientific
Characterize the chemical composition of the N-CDots
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Fourier-transform infrared spectroscopy
Spectrum 100
PerkinElmer
Characterize the kinetic behavior of the chemical bonds
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Blue LED chip
CREE, 450 nm, royal blue
CREE
Serve as the blue light source
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Scanning electron microscopy
Quanta 250
FEI
Analyze the morphology of the produced N-CDot fibers
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Integrating sphere
ISP-50-80-R
Ocean Optics Inc.
Measure photoluminescence and absorbance
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USB2000+ spectrometer
USB2000+
Ocean Optics Inc.
Measure photoluminescence and absorbance
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Fluorometer
Horiba Scientific Fluorolog
Horiba Scientific
Obtain the quantum yield
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