Charged Polariton Luminescence from an Organic Semiconductor Microcavity
Charged Polariton Luminescence from an Organic Semiconductor Microcavity
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DOI：
10.1021/acsphotonics.8b01502
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发表时间：
2019-02-01
期刊：
影响因子：
7
通讯作者：
Giebink, Noel C.
中科院分区：
文献类型：
--
作者：
Cheng, Chiao-Yu;Kim, Hoyeon;Giebink, Noel C.
在有机半导体微腔中，强耦合光到极化子的光跃迁导致一类不寻常的具有净电荷的极化子。这种物质可以提供一系列技术上有用的光电特性，但迄今为止只在被动反射率测量中观察到。在这里，我们报告了室温下的光致发光从上和下分支极化子极化激元状态，起源于空穴激发的p型掺杂的4，4 '-环己叉基双[N，N-双（4-甲基苯基）苯胺]（TAPC）微腔。我们在非共振激发下的观测结果与经典的偶极发射模型吻合得很好，这表明该系统中的极化子态是通过极化子激发态库的荧光辐射填充的。这些结果构成了极化子发光的有机半导体薄膜的第一个观察，是实现带电极化子凝聚体的重要先决条件。
Strong coupling light to polaron optical transitions in an organic semiconductor microcavity leads to an unusual class of polariton that possesses a net charge. This species may offer a range of technologically useful optoelectronic properties but has thus far only been observed in passive reflectivity measurements. Here, we report room-temperature photoluminescence from both upper and lower branch polaron polariton states that originate from hole excitations in a p-doped 4,4'-cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC) microcavity. Our observations under nonresonant excitation are in good agreement with classical dipole emission modeling, which suggests that polariton states in this system are populated radiatively via fluorescence from the polaron excited state reservoir. These results constitute one of the first observations of polaron luminescence from an organic semiconductor thin film and are an important prerequisite for realizing a charged polariton condensate.