Highly twisted pyrene derivatives for non-doped blue OLEDs

• Deep blue emitting materials based on pyrene core.
• Highly twisted blue emitting materials by xylene units.
• 3-Dimensionally highly twisted non-coplanar.
• Non-doped device using new pyrene exhibited efficiency of 3.69%.
• Non-doped EL devices showed high color purity of (0.15, 0.06).

New highly twisted rigid blue light-emitting materials were designed, composed of pyrene with a xylene core unit and either naphthalene or phenyl end units. These blue-emitting materials were synthesized via the Suzuki cross-coupling reaction and their structures were confirmed using FT-IR, 1H NMR, 13C NMR, and mass spectroscopy. The optical, electrochemical and thermal properties of the materials were investigated. The non-coplanar structure introduced by highly twisted xylene units provides steric hindrance, resulting in very deep blue emission. The fabricated devices exhibited a maximum external quantum efficiency (EQE) of 3.69% with CIE color coordinates (x, y: 0.15, 0.06).

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