Efficient Red Organic Light-Emitting Diodes Using 2-(2-(4-Pentylbicyclo[2.2.2]octan-1-yl)-6-(2-(1,1,7-trimethyl-7-tripheny siliyllethyl-1,2,3,5,6,7-hexahydropyrido[3,2,1-ij]quinolin-9-yl)vinyl)-4 H-pyran-4-ylidene)malononitrile as a Fluorescent Red Emitter

초록

The authors have demonstrated red organic light-emitting diodes (OLEDs) using a new fluorescent red emitter, 2-(2-(4-pentylbicyclo[2.2.2]octan-1-yl)-6-(2-(1,1,7-trimethyl-7-triphenysiliyllethyl-1,2,3,5,6,7-hexahydropyrido[3,2,1-ij]quinolin-9-yl)vinyl)-4H-pyran-4-ylidene)malononitrile (DCJTPSO), achieved the maximum external quantum efficiency (EQE) of 2.06%, current efficiency (CE) of 3.83 cd/A, and Commision Internationale De L'Eclairage (CIEx,y) coordinates of (0.58, 0.40) at 0.029 mA/cm(2) in comparison with control device using 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran which showed the maximum EQE of 1.07%, CE of 1.41 cd/A and CIEx, y coordinates of (0.61, 0.38) at 0.11 mA/cm(2). This result showed that the high performance of red device using DCJTPSO showed easier electron trapping directly on the emitter molecule.

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