Pyrene-based red room-temperature phosphorescent guest-materials with high quantum yield and narrow emission peak

Area of Science:

• Organic Chemistry
• Materials Science
• Photophysics

Background:

• Organic room-temperature phosphorescent (RTP) materials with red emission often suffer from short lifetimes, broad emission spectra, and low quantum yields.
• Developing high-performance red-emitting RTP materials is crucial for advanced optoelectronic applications.

Purpose of the Study:

• To design and synthesize novel pyrene-based guest materials for efficient pure red organic room-temperature phosphorescence.
• To investigate the impact of donor and acceptor group modifications on the photophysical properties of pyrene derivatives.

Main Methods:

• Synthesis of pyrene derivatives with donor and acceptor groups at specific positions.
• Characterization of photoluminescence properties, including emission spectra, quantum yield, and lifetime.
• Experimental and theoretical studies to elucidate structure-property relationships.

Main Results:

• Synthesized pyrene derivatives (Pr-Py, O-Pr-Py, N-Pr-Py, Pr-Py-N) exhibit pure red phosphorescent emission (636–682 nm) in a BP-doped system.
• Pr-Py-N/BP demonstrated a high phosphorescent quantum yield (9.00%) and a remarkable lifetime (60.15 ms) with a narrow full width at half maximum (FWHM) of 50 nm.
• Acceptor modification altered the chromophore behavior, while donor modification facilitated energy transfer, leading to high quantum yield and narrow emission.

Conclusions:

• Pyrene derivatives functionalized with donor and acceptor groups are effective for achieving high-performance red organic room-temperature phosphorescence.
• Strategic molecular design, including acceptor regulation and donor proximity, is key to optimizing quantum yield and emission characteristics.
• These findings pave the way for advanced red-emitting RTP materials in optoelectronics.