酸引发的碳点聚集改变了它们的发射，产生意想不到的深红色激光,Advanced Functional Materials

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酸引发的碳点聚集改变了它们的发射，产生意想不到的深红色激光
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-05-05 , DOI: 10.1002/adfm.202303363
Ling Tang _{1,

2} , Lin Ai ₁ , Ziqi Song ₁ , Laizhi Sui ₃ , Jingkun Yu ₁ , Xin Yang ₁ , Haoqiang Song ₁ , Baowei Zhang ₁ , Yongsheng Hu ₄ , Yongqiang Zhang ₁ , Yuxi Tian ₂ , Siyu Lu ₁

Affiliation

实现超 pH 响应荧光碳点 (CD) 具有挑战性，尤其是覆盖包括深红色激光在内的宽波长范围的可逆可调多色发射。这项研究报告了一种对连苯三酚进行一步溶剂热处理以获得明亮的 CD 的方法，该 CD 具有由 pH 变化引起的显着红移（从蓝色到深红色发射）。CD表现出优异的可逆pH响应：简单的酸处理立即将其最初的绿光发射140 nm转变为具有高颜色纯度的深红色发射并增强亮度，随后的碱添加返回绿光发射，这表明平滑和可逆的调节的荧光。详细的成分分析、形态跟踪和光动力学研究证明了离散、结构转变产生的发射的可逆变化，包括碳点的质子化及其随后由氢键引发的组装和部分聚集。丰富的氢键交联碳点网络，最终将量子产率从 11.3% 提高到 16.0%。此外，聚集的CD结晶成片状结构，作为激光发射的谐振腔，表现出优异的增益能力，并产生强烈的深红色激光。这项研究将 pH 调节、CD 组装的影响及其激光发射结合在一起，以证明开发多功能 CD 的巨大潜力。最终将量子产率从11.3%提高到16.0%。此外，聚集的CD结晶成片状结构，作为激光发射的谐振腔，表现出优异的增益能力，并产生强烈的深红色激光。这项研究将 pH 调节、CD 组装的影响及其激光发射结合在一起，以证明开发多功能 CD 的巨大潜力。最终将量子产率从11.3%提高到16.0%。此外，聚集的CD结晶成片状结构，作为激光发射的谐振腔，表现出优异的增益能力，并产生强烈的深红色激光。这项研究将 pH 调节、CD 组装的影响及其激光发射结合在一起，以证明开发多功能 CD 的巨大潜力。

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Acid-Triggered Aggregation of Carbon Dots Shifted Their Emission to Give Unexpected Deep-Red Lasing

It is challenging to realize ultra-pH-responsive fluorescent carbon dots (CDs), especially reversibly adjustable multichromatic emission covering a broad wavelength range including deep-red lasing. This study reports a one-step solvothermal treatment of pyrogallol to obtain brilliant CDs with a substantial bathochromic shift (from blue to dark red emission) induced by pH changes. The CDs show an excellent reversible pH response: simple acid treatment instantaneously shifts their initial green emission by 140 nm to a deep-red emission with high-color-purity and enhances brightness, subsequent alkali addition returned the green emission, suggesting smooth and reversible regulation of fluorescence. Detailed components analyses, morphology tracking, and photodynamic studies demonstrate the discrete, reversible shift of emission derived from structural transformations, which include protonation of the CDs and their subsequent assembly and partial aggregation triggered by hydrogen bonding. The abundant H-bonds crosslink the network of CDs, ultimately raising the quantum yield from 11.3% to 16.0%. Furthermore, the aggregated CDs crystallized into sheet-like structures that acted as a resonant cavity for lasing show excellent gain ability and lead to strong deep-red lasing. This study draws together pH regulation, the effects of CD's assembly, and their lasing emission to demonstrate significant potential for the development of versatile CDs.

更新日期：2023-05-05

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