Integrating Unexpected High Charge-Carrier Mobility and Low-Threshold Lasing Action in an Organic Semiconductor

Dan Liu; Xianxin Wu; Can Gao; Chenguang Li; Yingshuang Zheng; Yang Li; Ziyi Xie; Deyang Ji; Xinfeng Liu; Xiaotao Zhang; Liqiang Li; Qian Peng; Wenping Hu; Huanli Dong

doi:10.1002/anie.202200791

Integrating Unexpected High Charge-Carrier Mobility and Low-Threshold Lasing Action in an Organic Semiconductor

Angew Chem Int Ed Engl. 2022 Jun 20;61(25):e202200791. doi: 10.1002/anie.202200791. Epub 2022 Apr 21.

Authors

Dan Liu^{1

2}, Xianxin Wu^{2

3}, Can Gao¹, Chenguang Li⁴, Yingshuang Zheng⁵, Yang Li⁶, Ziyi Xie^{1

2}, Deyang Ji⁵, Xinfeng Liu^{2

3}, Xiaotao Zhang⁵, Liqiang Li⁵, Qian Peng², Wenping Hu⁷, Huanli Dong¹

Affiliations

¹ National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
² University of Chinese Academy of Sciences, Beijing, 100049, China.
³ CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.
⁴ Key Laboratory for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology, School of Materials and Engineering, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004, China.
⁵ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China.
⁶ Normal College, Shenyang University, Shenyang, 110044, China.
⁷ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Sciences, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering, (Tianjin), Tianjin, 300072, China.

PMID: 35298062
DOI: 10.1002/anie.202200791

Abstract

Integrating high charge-carrier mobility and low-threshold lasing action in an organic semiconductor is crucial for the realization of an electrically pumped laser, but remains a great challenge. Herein, we present an organic semiconductor, named as 2,7-di(2-naphthyl)-9H-fluorene (LD-2), which shows an unexpected high charge-carrier mobility of 2.7 cm² V^-1 s^-1 and low-threshold lasing characteristic of 9.43 μJ cm^-2 and 9.93 μJ cm^-2 and high-quality factor (Q) of 2131 and 1684 at emission peaks of 420 and 443 nm, respectively. Detailed theoretical calculations and photophysical data analysis demonstrate that a large intermolecular transfer integral of 10.36-45.16 meV together with a fast radiative transition rate of 8.0×10⁸ s^-1 are responsible for the achievement of the superior integrated optoelectronic properties in the LD-2 crystal. These optoelectronic performances of LD-2 are among the highest reported low-threshold lasing organic semiconductors with efficient charge transport, suggesting its promise for research of electrically pumped organic lasers (EPOLs).

Keywords: High Mobility; Low-Threshold Lasing; Organic Semiconductors; Strong Emission.

Abstract

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