Organic Light-emitting Devices with Different Hole-injection Layer

摘要

Organic light-emitting device have been realized by using 4, 4', 4"-tris{N,-(3-methylphenyl)-N-phenylamin}triphenylamine (m-MTDATA), N, N'-bis-(1-naphthyl)-N, N'-diphenyl-1, 1'-biph-enyl-4, 4'-diamine (NPB), 4, 4 (-N, N)-dicarbazole-biphenyl (CBP), and NPB:CBP as holes injection layer, respectively, and [2-methyl-6-[2-(2, 3, 6, 7-tetrahydro-1H, red fluorescent dye 4-(dicyanomethylene)-2-t-butyle-6-(1, 1, 7, 7-tetramethyljulolidyl-9-enyl) 4H-pyran (DCJTB), together with well known green fluorescent dye quinacridone (QAD) as emitting layer, tris-(8-hydroxyquinoline) aluminium (Alq_3) act as electron transport layer. WOLEDs was obtained with CBP or NPB:CBP as holes injection layer, the Commission Internationale de l'Eclairage (CIE) coordinates of the device C and D change from (0.408,0.4202) at 4 V to (0.4465,0.4646) at 11 V, (0.248,0.2791) at 4 V to (0.4616,0.4366) at 16 V, respectively. Its maximum luminance and maximum current efficiency of the device A was 3126 cd/m~2 at 11 V, and 2.28cd/A at 13 V, respectively.