White-light emitting self-assembled graphene quantum dots from coal soot

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2025-01-18 DOI:10.1007/s42823-025-00860-3

Shiv Rag Mishra, Tuhin Mandal, Rabi Narayan Senapati, Vikram Singh

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Abstract

Graphene quantum dots have recently gained significant attention for their potential application in the development of optoelectronic materials. The present study focused on the ultrasonic method to synthesize white-light-emitting graphene quantum dots from coal soot in just 2 min at room temperature. The white-light emission was achieved in solution and polymeric film with good Commission Internationale del’Eclairage index (0.28, 0.33) and (0.25, 0.30), respectively. The graphene quantum dots cover a significant fraction of the visible region in the emission spectrum with two prominent bands at 475 and 635 nm at 380 nm photoexcitation, corresponding to monomer and J-aggregate emission. The strong reducing and basic nature of the ethylene diamine facilitated the preparation of self-assembled J-aggregate graphene quantum dots through hydrogen bonding and electrostatic interaction. The mechanism of origin J-aggregate emission in the prepared graphene quantum dots was studied using UV–visible absorption, steady-state, lifetime fluorescence spectroscopy, and zeta potential. The as-synthesized graphene quantum dots are successfully coated on the UV-LEDs' surface and emit white light on the applied voltage. The colours of red, green, blue, and yellow balls appear significantly in the lighting of prepared white LEDs.

Graphical abstract

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从煤烟中发出白光的自组装石墨烯量子点

近年来，石墨烯量子点因其在光电材料开发中的潜在应用而受到广泛关注。本研究主要研究了在室温条件下，用超声波法在2分钟内从煤烟中合成白光石墨烯量子点。在溶液和聚合物薄膜中分别获得了良好的国际发光委员会指数（0.28,0.33）和（0.25,0.30）。石墨烯量子点覆盖了发射光谱中很大一部分可见区域，在380 nm光激发下，在475 nm和635 nm处有两个突出的波段，对应于单体和j聚集体发射。乙二胺的强还原性和碱性有利于通过氢键和静电相互作用制备自组装j聚集体石墨烯量子点。利用紫外可见吸收光谱、稳态光谱、寿命荧光光谱和zeta电位研究了制备的石墨烯量子点的起源j聚集体发射机理。合成的石墨烯量子点成功地涂覆在uv - led表面，并在施加电压下发出白光。红色、绿色、蓝色和黄色球的颜色在制备的白光led照明中明显出现。图形抽象

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.