Highly Bright Pure Room Temperature Phosphorescence for Circularly Polarized Organic Hyperafterglow

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Pure room-temperature phosphorescence (pRTP) offers advantages in exciton utilization and lifetime control but is limited by low brightness, efficiency, and color purity.
• Existing organic luminophores struggle to meet the demands of emerging applications due to these limitations.

Purpose of the Study:

• To design and develop highly bright, efficient, and narrowband pRTP materials with long lifetimes for advanced organic hyperafterglow.
• To investigate a strategy involving energy donors with circularly polarized (CP) luminescence and energy acceptors with multi-resonance effects within a rigid host.

Main Methods:

• Incorporation of a conjugated energy donor exhibiting circularly polarized (CP) luminescence.
• Integration of an energy acceptor with a multi-resonance effect within a rigid host matrix.
• Utilizing chiral P-containing binaphthyl aggregation to promote CP-pRTP and afterglow.

Main Results:

• Achieved high brightness up to ≈50 cd m⁻² and photoluminescence efficiency of ≈90%.
• Demonstrated narrowband emission (FWHM of 31-39 nm) with long lifetimes (120-770 ms) and luminescent dissymmetry of ≈10⁻³.
• Exhibited excellent stability against oxygen, organic solvents, and strong acids/bases.

Conclusions:

• The proposed approach successfully creates high-performance pRTP materials with enhanced photophysical properties.
• The developed materials enable applications in chirality information encryption, afterglow imaging, and 3D modeling.
• This work advances the understanding of organic afterglow brightness modulation and the construction of advanced pRTP materials.