研究目的
To develop a simple and green synthesis method for carbon quantum dots (CQDs) from coke for use in white light-emitting devices (LEDs).
研究成果
The study successfully demonstrated a green and simple method to prepare fluorescent CQDs from coke for white light-emitting devices. The CQDs exhibited a quantum yield of 9.2% and a blue-green-red spectral composition of 48%, making them suitable for cool white LED applications with a CIE chromaticity coordinate of (0.31, 0.35) and a CCT of 5125 K.
研究不足
The quantum yield of the coke-based CQDs is relatively low (9.2%), and the method's scalability and efficiency for industrial applications are not discussed.
1：Experimental Design and Method Selection:
A one-step chemical oxidation method using coke as starting materials and hydrogen peroxide as oxidizing agent was employed to synthesize CQDs.
2：Sample Selection and Data Sources:
Coke powders were obtained from Shanxi Datuhe Coking Co., Ltd.
3：List of Experimental Equipment and Materials:
Hydrogen peroxide, acetic acid, dialysis bag, UV-LED chip, and various characterization instruments including TEM, FT-IR spectrometer, UV-vis spectrophotometer, and luminescence spectrometer.
4：Experimental Procedures and Operational Workflow:
Coke powders were oxidized under ultrasonic conditions, heated, filtered, and purified. The CQDs were then freeze-dried for characterization and device fabrication.
5：Data Analysis Methods:
The optical properties, quantum yield, and device performance were analyzed using standard procedures and comparative methods.
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