Photosensitization-Controlled Dynamic Organic Room-Temperature Phosphorescence

Area of Science:

• Materials Science
• Organic Electronics
• Photophysics

Background:

• Dynamic organic room temperature phosphorescence (RTP) materials offer unique luminescence properties for intelligent optoelectronics.
• Existing dynamic RTP materials often have chromophores acting as both emitters and oxygen sensitizers, leading to poor control and reduced performance.

Purpose of the Study:

• To develop a strategy for controllable dynamic RTP materials with enhanced phosphorescence performance.
• To decouple the roles of phosphorescent emitters and oxygen sensitizers in dynamic RTP systems.

Main Methods:

• Integration of triplet photosensitizers into RTP polymers.
• Adjustment of photosensitizer concentration to control photoactivation time.
• Synthesis of diverse RTP polymers via copolymerization and physical doping.

Main Results:

• Achieved accurate control over photoactivation time (3-30 s) by adjusting photosensitizer concentration.
• Significantly prolonged phosphorescence lifetime after photoactivation (from 558 ms to 1017 ms).
• Demonstrated versatility through various RTP polymer syntheses and alternative photosensitizers.

Conclusions:

• The proposed strategy enables controllable dynamic RTP and maintains high phosphorescence performance.
• The developed materials show potential for dynamic intelligent afterglow displays and multilevel information encryption.
• This work advances stimuli-responsive materials for intelligent optoelectronics.