The synthesis of green fluorescent carbon dots for warm white LEDs |
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| Authors: | Qin Du Jingxia Zheng Junli Wang Yongzhen Yang Xuguang Liu |
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| Affiliation: | Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024 China.; College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024 China ; Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024 China ; College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024 China |
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| Abstract: | Green fluorescent carbon dots (CDs) were synthesized with pyrogallic acid as carbon source by solvothermal method in N,N-dimethylformamide (DMF). During the formation of the CDs, DMF not only serves as solvent for reaction, but also as nitrogen source to participate in the reaction. At the same time, it promotes the formation of large conjugated sp2-domain in CDs. The prepared CDs have an average size of 11.9 nm, excitation-independent emission centered at 520 nm and fluorescence quantum yield of 16.8%. For practical applications, warm white light-emitting diodes were fabricated by combining the CDs/N-[3-(trimethoxysilyl)propyl]ethylenediamine (KH-792) mixture with UV chip, which emitted warm white light with color coordinates of (0.39, 0.47) and a correlated color temperature of 4323 K suitable for indoor lighting.Green emissive carbon dots synthesized by solvothermal method is used for warm white light-emitting devices. |
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