Time-Dependent Colorful Circularly Polarized Organic Ultralong Room Temperature Phosphorescence from a...

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Colorful circularly polarized organic ultralong room temperature phosphorescence (CP-OURTP) materials are crucial for advanced optoelectronic devices.
• Developing single-component CP-OURTP materials with diverse colors remains a significant challenge.

Purpose of the Study:

• To propose a strategy for creating colorful CP-OURTP materials from single-component chiral molecules.
• To achieve dual emission bands with distinct lifetimes and high asymmetry factors.
• To demonstrate time-dependent color changes in CP-OURTP materials.

Main Methods:

• Introducing a chiral unit into the phosphorescence chromophore of a single-component molecule.
• Analyzing dual CP-OURTP bands originating from inherent triplet excitons and triplet-triplet annihilation induced delayed emission.
• Measuring emission lifetimes and asymmetry factors.
• Observing time-dependent changes in OURTP intensity ratios.

Main Results:

• Realization of dual CP-OURTP bands with lifetimes of 946.44 ms and 209.91 ms.
• Achieved maximum asymmetry factors of approximately 10⁻³.
• Demonstrated time-dependent color switching from yellow to green in CP-OURTP materials.
• Observed changes in OURTP intensity ratios at different delayed times.

Conclusions:

• A feasible strategy for developing colorful CP-OURTP materials from single-component chiral molecules was established.
• The developed materials exhibit tunable, time-dependent color emission.
• This work provides a platform for designing advanced circularly polarized luminescent materials.