Volume 13, Issue 7 1900036
Original Paper

Modulation of Amplified Spontaneous Emissions between Singlet Fluorescence and Triplet Phosphorescence Channels in Organic Dye Lasers

Shuai Li

Shuai Li

Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 P. R. China

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Zhenyi Yu

Corresponding Author

Zhenyi Yu

Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 P. R. China

E-mail: [email protected]; [email protected]Search for more papers by this author
Xiaoxiao Xiao

Xiaoxiao Xiao

Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 P. R. China

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Hua Geng

Hua Geng

Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 P. R. China

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Kai Wang

Kai Wang

Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 P. R. China

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Xue Jin

Xue Jin

Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 P. R. China

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Qing Liao

Qing Liao

Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 P. R. China

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Yi Liao

Yi Liao

Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 P. R. China

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Yishi Wu

Yishi Wu

Beijing National Laboratory for Molecular Sciences, Institute of chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

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Jiannian Yao

Jiannian Yao

Beijing National Laboratory for Molecular Sciences, Institute of chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

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Hongbing Fu

Corresponding Author

Hongbing Fu

Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 P. R. China

Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 P. R. China

E-mail: [email protected]; [email protected]Search for more papers by this author
First published: 19 June 2019
Citations: 15

Abstract

Organic gain materials (OGMs) currently used in dye lasers and organic thin-film amplifiers are limited to singlet-fluorescence molecules. Although heavy-metal-containing phosphorescent emitters enable highly efficient organic light-emitting diodes, phosphorescent OGMs capable of light amplification by stimulated emission from triplet states remain largely unexplored. Demonstrated herein is the first phosphorescent dye laser from a pure organic luminescent rotor (1), composed of electron-donating sulfide-substituted difluoroboron (SBF2) and electron-accepting nitrobenzene (NB) moieties. Furthermore, modulation of amplified spontaneous emissions (ASEs) between singlet fluorescence and triplet phosphorescence channels is achieved by adjusting the relative rotation (dihedral angle θ) of the donor and acceptor moieties. Theoretical calculations and experimental results clarify that free and restricted rotor rotation regulates the T2 state below and above the S1 state, thus switching on and off the intersystem crossing from S1 to the high-lying T2 for phosphorescence and fluorescence, respectively. Based on this strategy, methyl groups are added on the NB moiety to increase the steric hindrance in 2, leading to tunable phosphorescence and/or fluorescence ASE. The results extend the scope of organic dye lasers and provide a strategy to develop phosphorescence OGMs capable of amplifying light through ASE from the triplet state.

Conflict of Interest

The authors declare no conflict of interest.

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