Wang Liang, Li Weitao, Yin Luqiao, Liu Yijian, Guo Huazhang, Lai Jiawei, Han Yu, Li Gao, Li Ming, Zhang Jianhua, Vajtai Robert, Ajayan Pulickel M, Wu Minghong
Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China.
Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA.
Sci Adv. 2020 Oct 2;6(40). doi: 10.1126/sciadv.abb6772. Print 2020 Oct.
Quantum dots have innate advantages as the key component of optoelectronic devices. For white light-emitting diodes (WLEDs), the modulation of the spectrum and color of the device often involves various quantum dots of different emission wavelengths. Here, we fabricate a series of carbon quantum dots (CQDs) through a scalable acid reagent engineering strategy. The growing electron-withdrawing groups on the surface of CQDs that originated from acid reagents boost their photoluminescence wavelength red shift and raise their particle sizes, elucidating the quantum size effect. These CQDs emit bright and remarkably stable full-color fluorescence ranging from blue to red light and even white light. Full-color emissive polymer films and all types of high-color rendering index WLEDs are synthesized by mixing multiple kinds of CQDs in appropriate ratios. The universal electron-donating/withdrawing group engineering approach for synthesizing tunable emissive CQDs will facilitate the progress of carbon-based luminescent materials for manufacturing forward-looking films and devices.
量子点作为光电器件的关键组件具有固有优势。对于白光发光二极管（WLED），器件光谱和颜色的调制通常涉及不同发射波长的各种量子点。在此，我们通过可扩展的酸试剂工程策略制备了一系列碳量子点（CQD）。源自酸试剂的CQD表面上不断增加的吸电子基团促进了它们的光致发光波长红移并增大了它们的粒径，阐明了量子尺寸效应。这些CQD发出从蓝光到红光甚至白光的明亮且非常稳定的全色荧光。通过以适当比例混合多种CQD合成了全色发光聚合物薄膜和所有类型的高显色指数WLED。用于合成可调谐发光CQD的通用供电子/吸电子基团工程方法将促进用于制造前瞻性薄膜和器件的碳基发光材料的发展。
