White Light Emission from Planar Remote Phosphor Based on NHC Cycloplatinated Complexes.

Area of Science:

• Materials Science
• Inorganic Chemistry
• Photophysics

Background:

• Remote phosphors are crucial for solid-state lighting, requiring efficient and stable luminescent materials.
• N-heterocyclic carbene (NHC) ligands coordinated to platinum offer unique photophysical properties.

Purpose of the Study:

• To synthesize and characterize novel cycloplatinated NHC compounds for white light generation.
• To investigate the solid-state luminescence properties of these compounds for remote phosphor applications.

Main Methods:

• Stepwise synthesis of cycloplatinated NHC compounds and their ionic derivatives.
• X-ray crystallography for structural determination.
• Photophysical characterization including quantum yield measurements.
• Time-dependent-density functional theory (TD-DFT) calculations.
• Fabrication of white-light remote phosphors by combining blue, yellow, and red emitting components.

Main Results:

• Successful synthesis of new NHC compounds and ionic platinum complexes.
• X-ray structures determined for key compounds.
• Compounds 5, 8, and 9 exhibited high solid-state quantum yields (41%, 21%, 40%).
• Tunable white light achieved by combining different emitting components.

Conclusions:

• Novel cycloplatinated NHC complexes are efficient solid-state emitters.
• These compounds are suitable for developing high-performance white-light remote phosphors.
• Precise control over emitter contributions allows tuning of correlated color temperature (CCT) and color rendering index (CRI).