Highly photoluminescent copper carbene complexes based on prompt rather than delayed fluorescence

Area of Science:

• Coordination chemistry
• Photophysics
• Materials science

Background:

• Copper complexes are explored for photoemissive applications.
• Previous copper photoemitters often exhibit temperature-dependent emission.
• Achieving efficient prompt fluorescence in copper emitters remains a challenge.

Purpose of the Study:

• To synthesize and characterize linear two-coordinate copper complexes with cyclic (alkyl)(amino)carbenes (CAAC).
• To investigate the photoluminescence properties of these novel copper complexes.
• To evaluate their potential as efficient photoemissive materials.

Main Methods:

• Synthesis of CAAC-CuX complexes (X = halide).
• Photoluminescence spectroscopy.
• Temperature-dependent emission studies.
• Lifetime measurements.

Main Results:

• Linear two-coordinate CAAC-CuX complexes were successfully synthesized.
• These complexes display efficient solid-state photoluminescence with quantum yields up to 96%.
• The emission is temperature-independent from 4-300 K and occurs via prompt fluorescence with sub-nanosecond lifetimes.

Conclusions:

• Novel CAAC-CuX complexes represent a significant advancement in copper-based photoemitters.
• Their temperature-independent and highly efficient prompt fluorescence offers unique advantages.
• These findings open new avenues for developing stable and efficient light-emitting devices.