Used as a phosphorescent emitter in organic light-emitting diodes (OLEDs), particularly in red and near-infrared devices. Its strong spin-orbit coupling enables efficient triplet harvesting, resulting in high electroluminescence efficiency. Commonly doped into host materials in the emissive layer to enhance color purity and device performance. Suitable for display technologies and lighting applications where deep red emission is required. Also investigated in bioimaging due to its long-lived emission and stability under operational conditions.