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Highly efficient organic host/guest phosphorescent system with tunable lifetime and color
  • +8
  • changli zhang,
  • Lingyun Lou,
  • Yuzhan Li,
  • Sirong Sun,
  • Wentuo Hu,
  • Kainan Wang,
  • Xiaohui Zhao,
  • Dong Wang,
  • Hui Cao,
  • Wanli He,
  • Zhou Yang
changli zhang
University of Science and Technology Beijing
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Lingyun Lou
University of Science and Technology Beijing
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Yuzhan Li
University of Science and Technology Beijing
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Sirong Sun
University of Science and Technology Beijing
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Wentuo Hu
University of Science and Technology Beijing
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Kainan Wang
University of Science and Technology Beijing
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Xiaohui Zhao
University of Science and Technology Beijing
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Dong Wang
University of Science and Technology Beijing
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Hui Cao
University of Science and Technology Beijing
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Wanli He
University of Science and Technology Beijing
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Zhou Yang
University of Science

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Abstract

The tunability of organic room temperature phosphorescent (RTP) system is important but rarely reported. In this work, we report a series of host/guest ultralong organic room temperature phosphorescent materials with lifetime- and color-tuning properties. By doping a non-room temperature phosphorescence guest emitter 1, 8-Naphthalimide (NI) into a series of solid host matrices with higher triplet energy levels, the lifetime (0.20 s - 0.81 s) and color (yellow - green) of multiple RTP materials are realized. As the excitation wavelength is switched from 365 nm to 254 nm, the phosphorescent color changes significantly and the phosphorescent lifetime increases by a factor of almost two. Notably, the unique dual emission (fluorescence and phosphorescence) of the doped material 4BrBa-NI resulted in a different orange emission. The host/guest doping materials are prepared through co-crystallization or grinding, allowing for an efficient energy transfer from guest to host. The results indicate that strong intermolecular interactions and the intersystem crossing (ISC) ability of the guest play a significant role. In addition, the security protection and anti-counterfeit encryption applications for RTP materials are realized through various methods, such as handwritten pens, screen printing, and dynamic recognition of QR code, which significantly improves the commercial viability of the RTP materials.