Cyclization-enhanced photoactivatable reversible room-temperature phosphorescence for efficient real-time light...

Area of Science:

• Materials Science
• Photochemistry
• Polymer Chemistry

Background:

• Developing polymer-based photoactivated room-temperature phosphorescence (RTP) systems is crucial.
• Achieving ultrafast activation under ambient conditions remains a significant challenge.

Purpose of the Study:

• To synthesize cyclized phenothiazine derivatives for enhanced photoactivated RTP.
• To investigate the mechanism of ultrafast photoactivation in polymer matrices.

Main Methods:

• Synthesis of cyclized phenothiazine derivatives with diverse substituents.
• Incorporation of derivatives into a polyvinyl alcohol (PVA) matrix.
• Characterization of photoactivation dynamics and mechanistic studies (theoretical and experimental).

Main Results:

• Cyclized derivatives in PVA showed significantly enhanced dynamic photoactivation compared to monomers.
• A 2-second irradiation at ambient conditions increased RTP lifetime by 1.96x and quantum yield by 3.43x.
• Mechanism involves rigid cyclic architecture suppressing non-radiative decay and hydrogen bonding with PVA for isolation and vibration suppression.

Conclusions:

• The novel cyclization strategy effectively enhances RTP performance.
• The developed materials exhibit rapid photoactivation and erasure, suitable for light-responsive applications.
• This work provides a valuable approach for designing high-performance photoactivated materials.