High-Performance Novel Deep-Blue Emitting Materials Comprising an Anthracene Core for Non-Doped Fluorescent Organic Light-Emitting Diodes with Excellent Color Purity
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초록
내용
Four novel anthracene based emitters were designed and synthesized for non-doped deep-blue organic light-emitting diodes (OLEDs), namely, 4-(10-(4-(9H-carbazol-9-yl)-2-methylphenyl) anthracen-9-yl)-3-methylphenyl)diphenylphosphine oxide (CZm-AN-mPO), 4-(10-(4-(9H-carbazol-9-yl)phenyl)anthracen-9-yl)phenyl)diphenylphosphine oxide (CZ-AN-PO), 9,10-bis(5-(naphthalen-1-yl)pyridin-2-yl)anthracene (PyIN) and 9,10-bis(6-(naphthalen-1-yl)pyridin-3-yl)anthracene (PyOUT), respectively. Their photophysical, thermal, electrochemical and electroluminescence (EL) properties are systematically investigated. All four deep-blue emitters exhibited intense deep-blue emission in solution and neat film at room temperature. Particularly, the non-doped device using CZ-AN-PO as emissive layer exhibited a maximum external quantum efficiency of 7.3 % and deep-blue Commission Internationale de L’Eclairage coordinates (CIEx,y) of (0.15, 0.07).