Aggregation-Induced Stimulated Emission of 100% Dye Microspheres.
Aggregation-Induced Stimulated Emission of 100% Dye Microspheres.
复制标题
聚集诱导%20刺激%20发射%20of%20100%%20染料%20微球。
DOI：
10.1002/adom.202202956
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发表时间：
2023
影响因子：
9
通讯作者：
Yun,Seok-Hyun
中科院分区：
文献类型：
--
作者：
Kim,Kwon-Hyeon;Yan,Hao;Yun,Seok-Hyun
具有聚集诱导发射(AIE)特性的染料由于其在固态聚集体中的明亮发光而受到人们的关注。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。本文研究了四苯基乙烯(TPE)有机硼染料TPEQBN在薄膜和微腔激光器中的受激发射。利用飞秒泵浦-探测光谱技术，在500 nm处测量了高达230 cm−1的增益系数。利用速率方程，分析了与浓度和泵浦有关的增益动力学以及激光建立动力学。在激光振荡过程中，辐射受激发射可以获得高于90%的高瞬时量子产率。采用微流控乳液和溶剂挥发法制备了100%AIE染料固体微球。再加上高增益和1.76的高折射率，直径为2微米的微球通过纳秒泵浦显示出阈值为≈10 pJµm-2的激光。涂覆聚合物但不是裸露的微球被活细胞内化，并从细胞质内产生窄带腔模发射。这项工作展示了AIE染料作为激光材料的潜力。
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−1at 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.