材料科学
激光阈值
光致发光
放大自发辐射
激光器
光电子学
染料激光器
激发态
光化学
量子产额
共轭体系
聚合物
光学
荧光
波长
原子物理学
物理
化学
复合材料
作者
Yamin Han,Lubing Bai,Man Xu,Xiang An,Chuanxin Wei,Lili Sun,Ning Sun,Mengna Yu,Zhiqun He,Jinyi Lin,Changjin Ou,Linghai Xie,Changlong Yin,Chen Sun,Xue‐Hua Ding,Juan Cabanillas‐González,Wei Huang
标识
DOI:10.1002/adom.201902163
摘要
Abstract Thiophene‐based (Th‐based) derivatives have received wide attentions in organic optoelectronics due to their excellent and tuneable optoelectrical properties as well as chemical modification. However, the low photoluminescence quantum yield in solid state limits their application in solution‐processed light‐emitting optoelectronic devices, especially in organic lasers. Herein, a novel blue‐emitting steric Th‐based fluorophore (MC8‐Th) with excellent optical gain behavior for organic laser is reported. Interestingly, MC8‐Th neat film exhibits efficient exceptional deep‐blue amplified spontaneous emission (ASE) behavior with a remarkably low threshold of 6.0 µJ cm −2 and full‐width‐at‐half‐maximum value of 2.6 nm. Furthermore, random laser signals are also obtained with the lowest threshold of 4.1 µJ cm −2 when incorporating the compound into an inert polystyrene (PS) matrix. In addition, low threshold (16 µJ cm −2 , fivefold lower than those of F8BT neat films) yellow–green ASE emission (560 nm) is achieved through Förster resonance energy transfer. Meanwhile, ultrafast transient absorption spectroscopy is deployed here to observe the single‐molecular excitonic behavior in solution and PS‐blend, intermolecular excited state in neat film, and efficient energy transfer in MC8‐Th:F8BT‐blend films. As far as known, MC8‐Th shows lower threshold ASE/lasing behavior for the Th‐based conjugated materials.
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