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Coronene Doped Ultra--Long RTP Polymers with Visible Light Excitability in Air
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  • Guanyu Liu,
  • Junwu Chen,
  • Shiguo Zhang,
  • Yuefa Zhang,
  • Shanfeng Xue,
  • Qikun Sun,
  • Wenjun Yang
Guanyu Liu
Qingdao University of Science and Technology
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Junwu Chen
Qingdao University of Science and Technology
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Shiguo Zhang
Qingdao University of Science and Technology
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Yuefa Zhang
Qingdao University of Science and Technology
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Shanfeng Xue
Qingdao University of Science and Technology
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Qikun Sun
Qingdao University of Science and Technology
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Wenjun Yang
Qingdao University of Science and Technology

Corresponding Author:[email protected]

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Abstract

Abstract: It is emphasized that hetero- and heavy-atoms and specific inter-molecular interactions are essential for ultra-long organic room temperature phosphorescence (RTP), moreover, the RTP production dominantly requires high-energy UV light excitation. In the current work, we present that coronene (Cor) doped PMMA and PS can all emit bright and ultra-long RTP with lifetimes of 4.43 and 2.97 s in air under 365 nm light excitation, respectively. More significantly, it is first found that both Cor/PMMA and Cor/PS exhibit rare visible light excitability up to 500 nm, and their afterglows are naked-eye visible and the RTP lifetimes are up to 2.46 and 2.11 s under 440 nm light excitation, respectively. However, hetero- and heavy-atom-free Cor has neither common spin-orbital coupling nor visible light absorption band in polymer film, and Cor/PS is a full hydrocarbon system. Therefore, we propose that the multi-resonance effect and largely fused  systems are responsible for the abundant triplet population and the visible light excitability, signifying the significant enhancement of direct S0‒T1 transition. This work demonstrates a fresh RTP material system and phenomenon and provides a new perspective of understanding organic triplet generation and radiation.