Gram-Scale Synthesis of Highly Efficient Rare-Earth-Element-Free Red/Green/Blue Solid-State Bandgap Fluorescent Carbon Quantum Rings for White Light-Emitting Diodes,Angewandte Chemie International Edition

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Gram-Scale Synthesis of Highly Efficient Rare-Earth-Element-Free Red/Green/Blue Solid-State Bandgap Fluorescent Carbon Quantum Rings for White Light-Emitting Diodes
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-05-07 , DOI: 10.1002/anie.202103361
Ting Meng ₁ , Zifei Wang ₁ , Ting Yuan ₁ , Xiaohong Li ₁ , Yunchao Li ₁ , Yang Zhang ₁ , Louzhen Fan ₁

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The negative impact of rare-earth elements (REEs) on the environment, limited supply and high cost prompt the need for REE-free phosphor-converted white light-emitting diodes (LEDs). Here, we report the gram-scale synthesis of red/green/blue solid-state bandgap fluorescent carbon quantum rings (R/G/B-SBF-CQRs) with high quantum yields up to 30–46 %. This was achieved using cyano-group-bearing p-phenyldiacetonitrile as precursor and forming carbon quantum rings of different diameters through the linkage of curved carbon quantum ribbons of different lengths. The results show the role of cyano groups in inducing the curvature of the carbon quantum ribbons for CQR formation and emission of stable solid-state bandgap fluorescence. R/G/B-SBF-CQRs-phosphor-based LEDs emitted warm white light with low CCT (3576 K), high CRI (96.6), and high luminous efficiency (48.7 lm W⁻¹), comparable to REE-phosphor-based LEDs.

中文翻译：

用于白光发光二极管的高效无稀土红/绿/蓝固态带隙荧光碳量子环的克级合成

稀土元素 (REE) 对环境的负面影响、有限的供应和高成本促使人们需要无 REE 的磷光体转换白光发光二极管 (LED)。在这里，我们报告了红色/绿色/蓝色固态带隙荧光碳量子环（R/G/B-SBF-CQRs）的克级合成，其量子产率高达 30-46%。这是使用带有氰基的对苯基二乙腈作为前驱体并通过不同长度的弯曲碳量子带的连接形成不同直径的碳量子环来实现的。结果显示了氰基在诱导碳量子带弯曲以形成 CQR 和发射稳定固态带隙荧光中的作用。R/G/B-SBF-CQRs-基于磷光体的 LED 发出暖白光，具有低 CCT (3576 K)、高 CRI (96.6)、⁻¹ )，可与基于 REE 磷光体的 LED 相媲美。

更新日期：2021-07-12

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