Control of Photoluminescence of Carbon Nanodots via Surface Functionalization using Para-substituted Anilines

被引:156
作者
Kwon, Woosung [1 ]
Do, Sungan [1 ]
Kim, Ji-Hee [2 ]
Jeong, Mun Seok [2 ,3 ]
Rhee, Shi-Woo [1 ]
机构
[1] Pohang Univ Sci & Technol POSTECH, Dept Chem Engn, Pohang 790784, South Korea
[2] Sungkyunkwan Univ, Inst Basic Sci, Ctr Integrated Nanostruct Phys, Suwon 440746, South Korea
[3] Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea
来源
SCIENTIFIC REPORTS | 2015年 / 5卷
关键词
GRAPHENE QUANTUM DOTS; ELECTROLUMINESCENCE; SIZE; LUMINESCENCE; EMISSION; ARRAYS;
D O I
10.1038/srep12604
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Carbon nanodots (C-dots) are a kind of fluorescent carbon nanomaterials, composed of polyaromatic carbon domains surrounded by amorphous carbon frames, and have attracted a great deal of attention because of their interesting properties. There are still, however, challenges ahead such as blue-biased photoluminescence, spectral broadness, undefined energy gaps and etc. In this report, we chemically modify the surface of C-dots with a series of para-substituted anilines to control their photoluminescence. Our surface functionalization endows our C-dots with new energy levels, exhibiting long-wavelength (up to 650 nm) photoluminescence of very narrow spectral widths. The roles of para-substituted anilines and their substituents in developing such energy levels are thoroughly studied by using transient absorption spectroscopy. We finally demonstrate light-emitting devices exploiting our C-dots as a phosphor, converting UV light to a variety of colors with internal quantum yields of ca. 20%.
引用
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页数:10
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