Mondal Koushik, Pramanik Ashim, Mondal Tapashree, Panja Sujit Sankar, Sarkar Rajat, Kumbhakar Pathik
Nanoscience Laboratory, Dept. of Physics, National Institute of Technology Durgapur, 713209 West Bengal, India.
Dept. of Chemistry, National Institute of Technology Durgapur, 713209 West Bengal, India.
J Phys Chem Lett. 2022 Apr 7;13(13):3079-3088. doi: 10.1021/acs.jpclett.1c04228. Epub 2022 Mar 30.
Aggregation-induced enhancement (AIE) in the photoluminescence quantum yield (PLQY) from 12.5 to 51% in the ,-dimethylformamide (DMF)-stabilized Au nanocluster (AuNC) system is reported here. The self-assembling of AuNC has been achieved hydrogen bonding interaction, which is further utilized in designing the AuNC_DCM system for realizing a Förster resonance energy transfer (FRET)-based white LED (WLED), having CIE coordinates of (0.35, 0.29). The solution-processed fabrication strategy used, has given us the liberty to optimize its components for optimal full-spectrum light output. The CIE coordinates of the designed WLED have been improved further to (0.33, 0.32), with a high color rendering index of 93 and correlated color temperature of 5620 K by incorporating a green emitter, namely nitrogen-doped graphene quantum dots (NGQD), in the AuNC_DCM system. The excellent spectral quality of the as-designed WLED and the repeatability of the proposed fabrication method will make the developed AuNCs_DCM FRET conjugate useful in practical photonic applications.
本文报道了在N，N-二甲基甲酰胺（DMF）稳定的金纳米团簇（AuNC）体系中，光致发光量子产率（PLQY）从12.5%提高到51%的聚集诱导增强（AIE）现象。通过氢键相互作用实现了AuNC的自组装，这进一步被用于设计AuNC_DCM体系以实现基于Förster共振能量转移（FRET）的白光发光二极管（WLED），其CIE坐标为（0.35，0.29）。所采用的溶液法制备策略使我们能够自由优化其组件以实现最佳的全光谱光输出。通过在AuNC_DCM体系中加入绿色发光体，即氮掺杂石墨烯量子点（NGQD），设计的WLED的CIE坐标进一步提高到（0.33，0.32），显色指数高达93，相关色温为5620K。所设计的WLED优异的光谱质量和所提出制备方法的可重复性将使所开发的AuNCs_DCM FRET共轭物在实际光子应用中有用。
