Control of Photoluminescence of Carbon Nanodots via Surface Functionalization using Para-substituted Anilines
- Authors
- Kwon, W (Kwon, Woosung); Do, S (Do, Sungan); Kim, JH (Kim, Ji-Hee); Jeong, MS (Jeong, Mun Seok); Rhee, SW (Rhee, Shi-Woo)
- Issue Date
- Jul-2015
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.5
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 5
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147145
- DOI
- 10.1038/srep12604
- ISSN
- 2045-2322
- Abstract
- 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%.
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