激发态
飞秒
材料科学
无定形固体
超快激光光谱学
分子振动
分子内力
吸收(声学)
激光器
受激发射
半导体
光电子学
化学物理
原子物理学
分子物理学
分子
化学
光学
物理
结晶学
有机化学
复合材料
作者
Qi Wei,Ruihong Duan,Qi Zhang,Linghai Xie,Ruidong Xia,Yuanping Yi,Jérémie Léonard,Stefan Haacke,Juan Cabanillas‐González,Yan Qian,Wei Huang
标识
DOI:10.1002/adom.202001956
摘要
Abstract Amorphous thin films from solution‐processable semiconductors are key materials for low‐cost and large area optoelectronics. Design rules toward novel amorphous compounds with outstanding light emission and light amplification properties require understanding of the intimate relation between chemical and electronic structure. Here, a series of compounds with tunable electronic transition characters of the lowest excited state, from local excited (LE), hybrid local charge‐transfer (HLCT) to charge‐transfer (CT) character is delicately designed. By deploying a combination of computational calculations and femtosecond‐transient absorption experiments, it is shown that pure LE states strongly coupled to high wavenumber vibrational modes favor to form a few dominant discrete vibrational levels and are essential for optical gain, whereas HLCT or CT states are preferably coupled to low frequency vibrational modes and form a large number of consecutive vibrational levels which lead to broad excited‐state absorption overwhelming stimulated emission. The results provide guidelines for the rational design of efficient organic laser materials.
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