Ecient red organic light-emitting devices based on the uorescent dye ‘‘4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetra-methyljulolidyl-9-enyl)-4H-pyran (DCJTB) doped in co-host emitter (CHE) systems of rubrene/tris(8-hydroxyquinolinato)alumi-num (...
Ecient red organic light-emitting devices based on the uorescent dye ‘‘4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetra-methyljulolidyl-9-enyl)-4H-pyran (DCJTB) doped in co-host emitter (CHE) systems of rubrene/tris(8-hydroxyquinolinato)alumi-num (Alq3) [60/40] and of 9,10-di(2-naphthyl)anthracene (ADN)/Alq3 [60/40] which achieved a luminance eciency of 4.25.5 cd/Aat 20 mA/cm2 with Commission Internationale d’Eclairage coordinates of [0.64,0.35][0.62,0.37]. At high rubrene or ADN con-centration (>60%), this DCJTB doped CHE system has the advantage of alleviating the current-induced uorescence quenchingproblem often encountered in red organic electroluminescence (EL) devices and greatly improves the EL eciency over a wide rangeof drive current conditions..