1. Solution-processable carbon dots with efficient solid-state red/near-infrared emission.
- Author
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Qu, Yanfei, Bai, Xuewei, Li, Di, Zhang, Xiaoyu, Liang, Chao, Zheng, Weitao, and Qu, Songnan
- Subjects
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OPTOELECTRONIC devices , *CARBON , *PHOTOLUMINESCENCE , *LUMINESCENCE quenching , *QUANTUM dot synthesis , *OPTOELECTRONICS , *QUANTUM dots - Abstract
[Display omitted] Carbon dots (CDs) emerge as promising luminescent materials for potential applications in optoelectronics on basis of their merits including low cost, eco-friendliness and strong, color-tunable photoluminescence (PL). However, the research on solid-state emissive CDs is still at the primary stage because of the aggregation-caused quenching (ACQ) of PL and their poor film-formation ability. In this work, we produce CDs with branched-polyethylenimine (b-PEI) chemically functionalized on the surfaces. The thus newly synthesized P-CDs successfully overcome the bottleneck of ACQ effect and display efficient red and NIR emission in aggregate state. Under the excitation of 520 nm, a strong red emission (maxima of 640 nm) with a high photoluminescence quantum yield (PLQY) of 21% was observed for the P-CDs in neat film. Moreover, this design strategy endows the P-CDs with good film-formation ability via solution spin-coating, which significantly increases its value for the film-based optoelectronic devices. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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