Ammonium hydroxide modulated synthesis of high-quality fluorescent carbon dots for white LEDs with excellent color rendering properties

作者：Wang, Shengda; Zhu, Zhifeng; Chang, Yajing; Wang, Hui; Yuan, Nan; Li, Guopeng; Yu, Dabin^*; Jiang, Yang

来源：Nanotechnology, 2016, 27(29): 295202.

DOI：10.1088/0957-4484/27/29/295202

• carbon dots
• ammonium hydroxide-modulated
• high CRI
• WLED

A novel type of aqueous fluorescent carbon dot (CD) was synthesized using citric acid as the only carbon source via an ammonium hydroxide modulated method, providing a blue color gamut. The amino group is considered to be the key factor in the high fluorescence of CDs and a model is established to investigate the mechanism of fluorescence. In addition, white light-emitting diodes (WLEDs) are fabricated by utilizing the prepared CDs and rare earth luminescent materials (SrSi2O2N2:Eu and Sr2Si5N8:Eu) as color conversion layers and UV-LED chips as the excitation light source. The WLEDs produce bright white light with attractive color rendering properties including a color rendering index of up to 95.1, a CIE coordinate of (0.33, 0.37), and a T-c of 5447 K under a 100 mA driven current, indicating that the CDs are promising in the field of optoelectronic devices.

• 出版日期2016-7-22
• 单位中国科学院电工研究所; 合肥工业大学