The synthesis of green fluorescent carbon dots for warm white LEDs.
The synthesis of green fluorescent carbon dots for warm white LEDs.
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用于暖白光LED的绿色荧光碳点的合成
DOI:
10.1039/c8ra02226g
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发表时间:
2018-05-25
期刊:
影响因子:
3.9
通讯作者:
Liu, Xuguang
中科院分区:
文献类型:
--
作者:
Du, Qin;Zheng, Jingxia;Wang, Junli;Yang, Yongzhen;Liu, Xuguang
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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