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Correlating Room-Temperature Phosphorescence with Structural Dynamics by Water Accommodation in a Flexible
Qiuyi Huang1, Ziqian Xue1, Kaito Segawa2
1Institute for Integrated Cell-Material Sciences, Kyoto University Institute for Advanced Study, Kyoto University, Yoshida, Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan.
Flexible porous materials show a unique turn-on organic room-temperature phosphorescence (RTP) when accommodating water. This water-induced structural change enhances RTP properties, enabling visible feedback for information encoding.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Organic room-temperature phosphorescence (RTP) materials are vital for applications.
- Water typically quenches RTP, but its effect on porous materials is poorly understood.
Purpose of the Study:
- To investigate how water accommodation influences RTP properties in flexible porous materials.
- To elucidate the mechanism behind water-regulated RTP behavior.
Main Methods:
- Utilized a flexible hydrogen-bonded organic framework (FHOF) system.
- Employed comprehensive photophysical, structural, and theoretical analyses.
- Investigated water accommodation-induced structural dynamics.
Main Results:
- Demonstrated a reversible structural transformation (closed- to open-pore) upon water accommodation.
- Observed a counterintuitive turn-on of RTP properties.
- Correlated water-promoted RTP with structural transitions and regulation of intersystem crossing and triplet nonradiative decays.
Conclusions:
- Water accommodation can manipulate RTP properties through structural dynamics.
- Established a link between water-regulated triplet exciton behavior and structural changes.
- Opened avenues for multifunctional, intelligent flexible porous materials with visible feedback capabilities.
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