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Organic molecular crystal with a high ultra-deep-blue emission efficiency of ∼85% for low-threshold laser

2022; Elsevier BV; Volume: 204; Linguagem: Inglês

10.1016/j.dyepig.2022.110425

1873-3743

Zhiqiang Zhuo, Chuanxin Wei, Mingjian Ni, Jiangli Cai, Lubing Bai, He Zhang, Qiang Zhao, Lili Sun, Jinyi Lin, Wei Liu, Xue‐Hua Ding, Kang Shen, Wei Huang,

Porphyrin and Phthalocyanine Chemistry

Organic crystal with a high emission efficiency and excellent spectral stability is crucial for constructing low-threshold deep-blue organic laser. Here, we synthesized an organic lasing molecule (BPhDPF) with a steric diarylfluorene as the core building block, the single crystal of which has ultra-deep-blue emission with the photoluminescence quantum yield (PLQY) as high as 84.9%, as well as short lifetime and super-stable emission. Meanwhile, C-H ⋯ π interactions are easily observed in single crystal structure, contributing to the formation of BPhDPF polyhedral microcrystals by self-organize in solution. Interestingly, the intermolecular coupling and exited state were well inhibited by the large steric hindrance group at 9-position and 2-/7- flexible side-chain, which is critical to laser applications. Finally, the deep-blue emission organic laser was obtained with a peak located at 418 nm and very low threshold of Pth = 1.62 μJ cm−2. A novel organic lasing molecule has been developed, offering helpful information for further investigating organic lasers.