Efficient and stable red organic light emitting devices from a tetradentate cyclometalated platinum complex

• Tetradentate cyclometalated platinum complex PtON11–Me was synthesized efficiently.
• Device with a maximum EQE of 12.5% and CIE (x = 0.61, y = 0.36) was fabricated.
• Stable red device with a high operational lifetime of T0.97 ∼ 3200 h was achieved.

An efficient and stable red phosphorescent organic light emitting diode was developed using a tetradentate cyclometalated platinum complex. Devices employing the phosphorescent molecule, platinum(II)-9-(4-methylpyridin-2-yl)-2-(3-(quinolin-2-yl)phenoxy)-9H-carbazole (PtON11Me), yielded high external quantum efficiencies and high operational lifetimes. A maximum EQE of 12.5% and color coordinates CIE (x = 0.61, y = 0.36) was achieved in devices employing efficient hole blocking and transporting materials and a high operational lifetime of T0.97 ∼ 3200 h was achieved in devices utilizing electrochemically stable hole blocking and transporting materials.

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