Double-Model Decay Strategy Integrating Persistent Photogenic Radicaloids with Dynamic Circularly Polarized Doublet...

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Organic phosphors with circularly polarized persistent luminescence (CPPL) are crucial for optical encryption, bioimaging, and 3D displays.
• Achieving color-tunable CPPL in single-component organic materials presents significant challenges.

Purpose of the Study:

• To develop a single-component organic material capable of producing color-tunable circularly polarized persistent luminescence (CPPL).
• To elucidate the mechanism behind the tunable CPPL emission for potential applications.

Main Methods:

• In situ photoimplanting of radical ion pairing into axial chiral crystals.
• Utilizing a double-module decay strategy combining triplet emission from neutral diphosphine and doublet radiance from photogenic radicals.
• Investigating the influence of photoactivation and observation time on luminescence properties.

Main Results:

• Demonstrated a novel strategy for achieving colorful CPPL in a single organic crystalline framework.
• Achieved tunable CPPL emission from blue and orange to delayed green by controlling photoactivation and observation times.
• Identified asymmetric electron migration and hybrid n-π* and π-π* electronic transitions as key mechanisms for the observed luminescence.

Conclusions:

• The developed double-module decay strategy enables unprecedented color tuning in single-component organic CPPL materials.
• The findings pave the way for advanced optical applications, including dynamic displays and enhanced encryption.
• The study highlights the potential of manipulating photoactivation and observation dynamics for controlling luminescence properties.