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Deep blue emitters are highly desired and intensively investigated for organic light emitting diodes for high quality full color display or solid state lighting applications. Here a new strategy for deep blue phosphorescent emission is demonstrated through the incorporaiton of 6-membered metal chelation rings in the tetradentate metal complex molecular structure. The platinum metal complex PtNON was synthesized and fully characterized. The emission spectra of PtNON shows a deep blue emission peaking at 438 nm at 77 K and a red-shifted, broadened, and structureless emission band centered at 508 nm at room temperature. The photoluminescent quantum yield of PtNON reaches a high value of 83%, and its luminescent lifetime remains as short as 3.76 μs in a 5% doped PMMA thin film. Organic light emitting diodes devices with PtNON as an emissive material were fabricated, achieving a peak device efficiency of 24.4% in a device structure designed for charge confinement. Furthermore, device architectures using known stable components with PtNON demonstrated an operational lifetime to 70% initial luminance estimated at over 30 000 h at 100 cd/m 2 while also retaining moderate efficiencies over 10% despite the high triplet energy over 2.8 eV for the emitter.
Fleetham et al. (Wed,) studied this question.