Enhanced Red Persistent Room-Temperature Phosphorescence Induced by Orthogonal Structure Disruption during Electronic...

Area of Science:

• Organic Chemistry
• Photophysics
• Materials Science

Background:

• Long-wavelength room-temperature phosphorescence (RTP) is vital for high-resolution bioimaging due to minimal autofluorescence.
• Achieving efficient long-wavelength RTP remains a significant challenge in materials science.

Purpose of the Study:

• To develop enhanced red RTP materials for improved bioimaging.
• To elucidate the unique photophysical mechanism behind the observed enhanced RTP.

Main Methods:

• Synthesis of deuterated dibenzo[g.p]chrysenes substituted with phenoxazine.
• Spectroscopic analysis to investigate photophysical properties, including quantum yield and lifetime.
• Computational or experimental determination of molecular geometry and excited state dynamics.

Main Results:

• Achieved bright, persistent red RTP with a 16% quantum yield and 1.8 s average lifetime.
• Identified a unique mechanism involving an orthogonal dihedral angle that enhances triplet generation and phosphorescence rate.
• Demonstrated that changes in dihedral angle modulate phosphorescence efficiency by influencing excited state pathways.

Conclusions:

• The developed deuterated dibenzo[g.p]chrysene derivatives offer a promising platform for efficient long-wavelength RTP.
• The unique photophysical mechanism provides a new strategy for designing high-performance phosphorescent materials.
• These findings pave the way for advanced applications in areas like biological imaging and sensing.