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Aggregation-Induced Stimulated Emission of 100% Dye Microspheres
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-04-19 , DOI: 10.1002/adom.202202956 Kwon-Hyeon Kim 1 , Hao Yan 1 , Seok-Hyun Yun 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-04-19 , DOI: 10.1002/adom.202202956 Kwon-Hyeon Kim 1 , Hao Yan 1 , Seok-Hyun Yun 1
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Dyes with aggregation-induced emission (AIE) properties have gained interest due to their bright luminescence in solid-state aggregates. While fluorescence from AIE dyes is widely exploited, relatively little is known about aggregation-induced stimulated emission. Here, stimulated emission of tetraphenylethene (TPE)-based organoboron AIE dyes, TPEQBN, in thin films and in microcavity lasers is investigated. Using femtosecond pump–probe spectroscopy, gain coefficients up to 230 cm−1 at 500 nm are measured. Using rate equations, concentration- and pump-dependent gain dynamics as well as laser build-up dynamics are analyzed. During laser oscillation, radiative stimulated emission allows high instantaneous quantum yield greater than 90% to be achieved. Solid-state microspheres made of 100% AIE dyes are fabricated via microfluidic emulsion and solvent evaporation method. Coupled with high gain and high refractive index of 1.76, microspheres as small as 2 µm in diameter show lasing by nanosecond pumping with a threshold of ≈10 pJ µm–2. Polymer coated, but not bare, microspheres are internalized by live cells and generate narrowband cavity-mode emission from within the cytoplasm. This work shows the potential of AIE dyes as laser materials.
中文翻译：
100% 染料微球的聚集诱导受激发射
具有聚集诱导发射（AIE）特性的染料因其在固态聚集体中发出明亮的发光而引起了人们的兴趣。虽然 AIE 染料的荧光被广泛利用，但人们对聚集诱导的受激发射知之甚少。在此，研究了基于四苯乙烯 (TPE) 的有机硼 AIE 染料 TPEQBN 在薄膜和微腔激光器中的受激发射。使用飞秒泵浦-探针光谱，测量500 nm处高达230 cm -1的增益系数。使用速率方程，分析浓度和泵浦相关的增益动态以及激光建立动态。在激光振荡过程中，辐射受激发射可以实现大于 90% 的高瞬时量子产率。通过微流体乳液和溶剂蒸发方法制备由 100% AIE 染料制成的固态微球。加上高增益和 1.76 的高折射率，直径小至 2 µm 的微球通过纳秒泵浦显示出激光，阈值约为 10 pJ µm –2 。聚合物涂层而非裸露的微球被活细胞内化，并从细胞质内产生窄带空腔模式发射。这项工作展示了 AIE 染料作为激光材料的潜力。
更新日期：2023-04-19
中文翻译：
100% 染料微球的聚集诱导受激发射
具有聚集诱导发射（AIE）特性的染料因其在固态聚集体中发出明亮的发光而引起了人们的兴趣。虽然 AIE 染料的荧光被广泛利用，但人们对聚集诱导的受激发射知之甚少。在此，研究了基于四苯乙烯 (TPE) 的有机硼 AIE 染料 TPEQBN 在薄膜和微腔激光器中的受激发射。使用飞秒泵浦-探针光谱，测量500 nm处高达230 cm -1的增益系数。使用速率方程，分析浓度和泵浦相关的增益动态以及激光建立动态。在激光振荡过程中，辐射受激发射可以实现大于 90% 的高瞬时量子产率。通过微流体乳液和溶剂蒸发方法制备由 100% AIE 染料制成的固态微球。加上高增益和 1.76 的高折射率，直径小至 2 µm 的微球通过纳秒泵浦显示出激光，阈值约为 10 pJ µm –2 。聚合物涂层而非裸露的微球被活细胞内化，并从细胞质内产生窄带空腔模式发射。这项工作展示了 AIE 染料作为激光材料的潜力。
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