Used as a phosphorescent emitter in organic light-emitting diodes (OLEDs), particularly in display and lighting technologies. Its strong spin-orbit coupling enables efficient triplet-to-singlet emission, resulting in high electroluminescence efficiency. Commonly doped into host materials in the emissive layer to achieve blue or sky-blue light with good color purity. Also investigated for use in solid-state lighting due to thermal and electrochemical stability. Suitable for both vacuum-deposited and solution-processed OLED devices.