Leveraging Multivalent Assembly towards High-Temperature Liquid-Phase Phosphorescence

Area of Science:

• Materials Science
• Supramolecular Chemistry

Background:

• High-temperature phosphorescence (HTP) materials are promising but degrade in polar solvents.
• Deactivation in polar media limits the reliability and utility of HTP materials.

Purpose of the Study:

• To develop a strategy for achieving stable high-temperature liquid-phase phosphorescence (HTLP).
• To enhance the photophysical properties of HTLP materials for practical applications.

Main Methods:

• Utilized a multivalent assembly strategy involving robust hydrogen-bonding networks.
• Incorporated multitopic phosphors to boost multivalent interactions.
• Investigated phosphorescence in various high-temperature polar media.

Main Results:

• Achieved visible afterglow in boiling water (5 s) and DMSO at 460 K (>2 s).
• Demonstrated a long phosphorescence lifetime (70.3 ms) in NMP at 476 K.
• Successfully applied HTLP materials for in-situ microcrack detection and anticounterfeiting.

Conclusions:

• The multivalent assembly strategy effectively immobilizes phosphors and protects triplet excitons.
• The developed HTLP materials exhibit excellent stability and enhanced photophysical properties in polar media.
• HTLP materials offer promising solutions for high-temperature sensing and security applications.