4.7 Article

A rational strategy for directly synthesizing strongly yellow solid-state fluorescent-emitting carbon nanodots composite microparticles by structure regulation

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MATERIALS TODAY ADVANCES
卷 20, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.mtadv.2023.100428

关键词

Carbon nanodot composite; Lamellar structure; Epoxy-amine reaction; Optoelectronic applications; Solid-state fluorescence

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This work proposes a rational strategy for the synthesis of yellow fluorescent carbon nanodots (Y-CDs)-based microparticles with high solid-state photoluminescence. By adjusting the amount of bridge molecule KH-560, the morphology and fluorescence intensity of the microparticles can be controlled. Moreover, the optimal Y-CDs particles can be combined with blue chips to fabricate high-performance white light-emitting diodes with a high color rendering index.
Carbon nanodots (CDs) have received huge attention of researchers due to their good optical properties. However, CDs generally suffer from severely fluorescence self-quenching once they are aggregated or in solid state, limitating their applications in light-emitting devices. In this work, we report a rational strategy for synthesis of yellow fluorescent carbon nanodots (Y-CDs)-based microparticles with a high solid-state photoluminescence quantum yield (32.02%). It is the first report on designing a lamellar structured matrix to disperse CDs to realize long-wavelength solid fluorescence. The matrix is confirmed as p-phenylenediamine dihydrochloride by X-ray diffraction (XRD). 3-glycidyloxypropyltrimethoxysilane (KH-560) acts as a bridge to connect CDs to the matrix based on epoxy-amine reaction and silane hydrolysis condensation for uniform dispersion of CDs and high solidstate luminescence can be easily achieved. Meanwhile, through adjusting the amount of KH-560, the morphology of Y-CDs-based microparticles can be controlled from cube to layered structure and the fluorescence intensity can be significantly improved. Importantly, the optimal Y-CDs particles can be combined with blue chips (450 nm) to fabricate high-performance white light-emitting diodes (WLEDs) without using commercial phosphor, and the constructed WLEDs exhibit a high color rendering index (CRI) of 84.2.

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