Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp3 Bonding Strategy

• DOI: 10.1002/adma.202200011
• Publication Date: 2022-03-05T07:48:35Z
• Authors: Jiahui Xu; Qingjing Liang; Zijian Li; Vladimir Yu. Osipov; Yangjian Lin; Binghui Ge; Qian Xu; Junfa Zhu; Hong Bi
• Keywords: Ultraviolet; Quantum yield; Rational design

Carbon dots (CDs) have received tremendous attention for their excellent photoluminescence (PL) properties. However, it remains a great challenge to obtain CDs with ultraviolet (UV, 200-400 nm) emission in solid state, which requires strict control of the structure and overcoming aggregation-caused quenching (ACQ). Herein, new sp3 compartmentalization strategy is developed meet these requirements, by employing acetic acid promote fractions bonding during synthesis CDs. It markedly decreases size sp2 conjugating units CDs, shifts PL B (UVB) region (λmax = 308 nm). Moreover, domains are well spatially compartmentalized ACQ effect minimized, enabling high quantum yield state (20.2%, λex 265 narrow bandwidth 24 nm environmental robustness. The solid-state UVB emissive highly desired application photonic devices. Hence, demo light-emitting diodes fabricated plant lighting, leading 29% increase ascorbic content basil. Overall, rational efficient way construct UVB-CDs phosphors wide applications provided.