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White luminescent single-crystalline chlorinated graphene quantum dots.
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-03-16 , DOI: 10.1039/d0nh00053a
Weitao Li 1 , Huazhang Guo , Gao Li , Zhen Chi , Hailong Chen , Liang Wang , Yijian Liu , Keng Chen , Mengying Le , Yu Han , Luqiao Yin , Robert Vajtai , Pulickel M Ajayan , Yuxiang Weng , Minghong Wu
Affiliation  

A new class of white luminescent materials, white-light-emitting graphene quantum dots (WGQDs), have attracted increasing attention because of their unique features and potential applications. Herein, we designed and synthesized a novel WGQDs VIA a solvothermal molecular fusion strategy. The modulation of chlorine doping amount and reaction temperature gives the WGQDs a single-crystalline structure and bright white fluorescence properties. In particular, the WGQDs also exhibit novel and robust white phosphorescence performance for the first time. An optimum fluorescence quantum yield of WGQDs is 34%, which exceeds the majority of reported WGQDs and other white luminescent materials. The WGQDs display broad-spectrum absorption within almost the entire visible light region, broad full width at half maximum and extend their phosphorescence emission to the entire white long-wavelength region. This unique dual-mode optical characteristic of the WGQDs originates from the synergistic effect of low-defect and high chlorine-doping in WGQDs and enlarges their applications in white light emission devices, cell nuclei imaging, and information encryption. Our finding provides us an opportunity to design and construct more advanced multifunctional white luminescent materials based on metal-free carbon nanomaterials.

中文翻译:

白色发光的单晶氯化石墨烯量子点。

新型的白色发光材料,即发白光的石墨烯量子点(WGQD),由于其独特的功能和潜在的应用而受到越来越多的关注。在这里,我们设计并合成了一种新颖的WGQD VIA溶剂热分子融合策略。氯掺杂量和反应温度的调节使WGQD具有单晶结构和明亮的白色荧光特性。特别是,WGQD还首次展现出新颖而强大的白色磷光性能。WGQD的最佳荧光量子产率为34%,超过了大多数报道的WGQD和其他白色发光材料。WGQD在几乎整个可见光区域内显示广谱吸收,在一半最大值处具有宽的全宽度,并将其磷光发射扩展到整个白色长波长区域。WGQD的这种独特的双模光学特性源自WGQD中低缺陷和高氯掺杂的协同效应,并扩大了它们在白光发射设备,细胞核成像和信息加密中的应用。我们的发现为我们提供了基于无金属碳纳米材料设计和构建更高级的多功能白色发光材料的机会。
更新日期:2020-03-16
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