Blue Phosphorescent Organic Light-Emitting Didoe (PHOLED) is a sole solution for overcoming deficit electroluminescence efficiency (EL) of blue fluorescent OLEDs. However, low device lifetime of PHOLED has been a key issue that delays its commercial debut. In this work, we demonstrate the unprecedented device lifetime of blue PHOLED which is the longest device lifetime to our best knowledge. Platinum(II) complex-based PHOLED exhibits deep blue emission with Commission International de l’Eclairage (CIE) y-value less than 0.2. Newly designed tetradentate platinum (II) complex played a critical role on improving stability along with host materials which forms intermolecular charge-transfer(CT) complex. Addition of di-tert-butylbenzene to benzimidazole not only prohibits undesired CT complex between host and guest but also enhanced material stability by having high metal centered triplet state(3MC) in the Pt complex. The both host materials of hole transporting and electron transporting materials utilized tert-phenyl-silane as a bulky unit to enhance color purity of PHOLED and material stability of host materials.
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