Used as a phosphorescent emitter in organic light-emitting diodes (OLEDs), particularly in red and near-infrared regions. Its strong spin-orbit coupling enables efficient triplet harvesting, making it ideal for high-efficiency electroluminescent devices. Commonly employed in display technologies and solid-state lighting due to excellent color purity and thermal stability. Also investigated in photoredox catalysis and as a luminescent probe in biological imaging owing to long emission lifetimes and sensitivity to microenvironment changes.