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Vibrational-State-Regulated Hot-Band Thermal Activation for Anti-Stokes Luminescence.
Heming Zhang1, Jiaxuan Wang2, Zhiqiang Li1
1Jihua Laboratory, 28 Huandao South Road, Foshan, Guangdong 528200, P. R. China.
The Journal of Physical Chemistry Letters
|January 22, 2026
Summary
This study introduces a molecular design for hot-band absorption (HBA) to enhance anti-Stokes luminescence. Tailoring peripheral groups modulates vibrational modes, enabling efficient photon emission using thermal energy.
Area of Science:
- Materials Science
- Photochemistry
- Molecular Engineering
Background:
- Hot-band absorption (HBA) is crucial for anti-Stokes luminescence, enabling photon emission at higher energies by utilizing environmental thermal energy.
- Achieving thermal vibrational activation (υ = 0 → 1) is a critical challenge in molecular design for HBA.
- Current molecular designs often struggle to efficiently control the vibrational modes necessary for HBA.
Purpose of the Study:
- To present a novel molecular design strategy for enhancing hot-band absorption (HBA) through tailored vibrational mode modulation.
- To elucidate the mechanism of thermal vibrational activation in HBA systems by differentiating the roles of resonance cores and peripheral groups.
- To establish a theoretical framework for analyzing vibrational mode contributions and guiding the development of advanced anti-Stokes luminescent materials.
Main Methods:
- Molecular design integrating a multi-resonance core with specifically tailored peripheral groups.
- Modification of peripheral groups to modulate vibrational modes contributing to thermal vibrational activation.
- Application of statistical mechanics to develop a theoretical approach for analyzing individual vibrational mode contributions.
Main Results:
- Demonstrated a molecular design strategy that effectively modulates vibrational modes for HBA.
- Elucidated the distinct roles of resonance cores (low-energy modes) and peripheral groups (high-energy modes) in thermal vibrational activation.
- Established a quantitative structure-property relationship for HBA systems.
Conclusions:
- The proposed molecular design strategy provides a pathway to engineer efficient anti-Stokes luminescent materials.
- Understanding the interplay between molecular structure and vibrational modes is key to optimizing HBA.
- This work lays the foundation for developing next-generation luminescent materials with tunable optical properties.
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