The Assembly of Unique Hexanuclear Copper(I) Complexes with Effective White Luminescence.

Area of Science:

• Coordination Chemistry
• Materials Science
• Solid-State Luminescence

Background:

• Copper iodide complexes are known for their diverse structures and photoluminescent properties.
• Developing novel luminescent materials with efficient solid-state emission is a key area of research.

Purpose of the Study:

• To synthesize and characterize novel L2Cu6I6 complexes.
• To investigate the solid-state luminescence properties of these complexes.
• To elucidate the origin of their white emission.

Main Methods:

• Synthesis of L2Cu6I6 complexes via reaction of phosphine ligands with copper iodide.
• X-ray diffraction for structural determination.
• Powder X-ray diffraction (PXRD) for phase analysis.
• Photoluminescence spectroscopy for emission studies.
• Quantum chemical computations for theoretical analysis.

Main Results:

• Successfully obtained unique L2Cu6I6 complexes featuring two Cu3I3 units.
• Identified two distinct crystalline phases for the complexes using PXRD.
• Observed rare solid-state white emission at room temperature with emission bands at 464 nm and 610 nm.
• Quantum chemical calculations attributed the emission bands to 3(M+X)LCT and 3CC transitions.
• Achieved high quantum yields for white luminescence, reaching 15-20%.

Conclusions:

• The synthesized L2Cu6I6 complexes are promising candidates for solid-state white light emitters.
• The observed white emission originates from distinct electronic transitions within the complex.
• The ability to form different crystalline phases may influence luminescence properties.