Affiliation:
1. Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology 030024 Taiyuan P. R. China
2. Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering 030032 Taiyuan P. R. China
3. College of Materials Science and Engineering Taiyuan University of Technology 030024 Taiyuan P. R. China
4. School of Chemical Engineering and Technology North University of China 030051 Taiyuan P. R. China
5. School of Energy and Power Engineering North University of China 030051 Taiyuan P. R. China
Abstract
AbstractWhite‐light‐emitting carbon dots (WCDs) show innate advantages as phosphors in white light‐emitting diodes (WLEDs). For WLEDs, the color rendering index (CRI) is the most important metric to evaluate its performance. Herein, WCDs are prepared by a facile one‐step solvothermal reaction of trimellitic acid and o‐phenylenediamine. It consists of four CDs identified by column chromatography as blue, green, yellow, red, and thus white light is a superposition of these four types of light. The mixture of the four CDs undergoes Förster resonance energy transfer to induce the generation of white light. The photoluminescence of WCDs originates from the synergistic effect of carbon core and surface states. Thereinto, the carbon core states dominate in RCDs, and the increase of amide contents and degree of conjugation promote the redshift of the emission spectra, which is further confirmed by theoretical calculations. In addition, a high CRI of 97 is achieved when the WCDs are used as phosphors to fabricate WLEDs, which is almost the highest value up to now. The multicolor LEDs can also be fabricated by using the four multicolor CDs as phosphors, respectively. This work provides a novel approach to explore the rapid preparation of low‐cost, high‐performance WCDs and CDs‐based WLEDs.
Funder
National Natural Science Foundation of China
Shanxi Scholarship Council of China
Subject
General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)
Cited by
28 articles.
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