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Force-Light-Electric Three-Dimensional Dynamic Mechanism of Room-Temperature Phosphorescence Materials under
Huanling Liu1, Yang Gao1, Lili Lin1
1Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, Institute of Materials and Clean Energy, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
The Journal of Physical Chemistry Letters
|July 22, 2025
Summary
This study reveals how hydrostatic pressure affects the luminescence and charge transport of flexible molecular materials. Certain phenothiazine derivatives show unique pressure-responsive behaviors, enhancing display technology.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Adaptive deformation display technology requires advanced flexible materials beyond traditional options.
- Existing research on room-temperature phosphorescence (RTP) materials often focuses on limited properties, hindering a full understanding of their stimuli-responsive behavior.
Purpose of the Study:
- To investigate the impact of hydrostatic pressure on the luminescence and charge transport properties of phenothiazine (PTZO) and trifluoromethyl (CF3) substituted derivatives.
- To establish a unified characterization of molecular performance under pressure within a three-dimensional force-light-electric model.
- To uncover the coupling mechanisms between molecular structure, packing, excited states, and stimuli-responsive properties.
Main Methods:
- Systematic investigation of nine PTZO and CF3-substituted molecules under hydrostatic pressure (0-6 GPa).
- Characterization of luminescence properties (emission wavelength, spin-orbit coupling, radiative and nonradiative decay rates).
- Analysis of charge transport properties (hole and electron mobilities).
Main Results:
- Distinct pressure-induced responses observed across the nine molecules.
- PTZO-2CF3 derivatives showed monotonic changes in emission wavelength and spin-orbit coupling strength due to electron-withdrawing CF3 groups.
- Nonradiative decay rates decreased with pressure, enhancing luminescence efficiency, while radiative rates remained stable.
- Most molecules exhibited enhanced hole-dominated charge transport; PTZO-H-3F showed electron-dominated transport, and PTZO-H-2F displayed pressure-induced bipolar transport.
Conclusions:
- The study reveals complex "force-light-electric" dynamic processes in flexible molecular materials under hydrostatic pressure.
- Insights gained are crucial for designing high-performance, intrinsically flexible molecular materials for adaptive deformation displays.
- The findings pave the way for developing novel pressure-responsive organic emitters and advanced display technologies.
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