A High-performance top-emitting green phosphorescent OLED with a long operational lifetime, an LT of 200% longer and with a high current efficiency, 118% higher than the devices with state-of-the art Ir complexes at the luminance of 15,000 cd m −2 , was realized using a developed Pt complex and new hole transporting buffer and exciplex host materials. To the best of our knowledge, the current efficiency and lifetime of our achievements at this high luminance are more than 1.5 times higher and 100 times longer, respectively, than those of green phosphorescent OLEDs with Pt complexes from literatures and materials companies in the world. This high current efficiency was achieved with higher horizontal transition dipole ratio, 86%, and short decay time, 2.4 μs, of our own developed Pt complex.

The efficiency of light emitting materials (dopants) is invariably compromised on moving to the red region of the spectra due to the increase of non‐radiative decay. In order to solve the above problem, we designed a new dopant, and realized organic light emitting diodes (OLEDs) with excellent performance. We achieved extremely high quantum yield of red dopant, fabricated a device with 33% higher efficiency, and improved roll‐off compared to a device with a current state‐of‐the art emitter.