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Blue electroluminescent materials based on indeno[1,2-a]arene derivatives for Organic Light-Emitting Diodes
Authors:Namhee Hwang  Jinho Park  Song Eun Lee
Affiliation:1. Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Korea;2. Department of Information Display, Hongik University, Seoul, 121-791, Korea
Abstract:Abstract

In this study, as a continuous effort for searching efficient blue-emitting materials, we designed and synthesized materials based on indeno[1,2-a]arene. OLED devices using these materials were fabricated in the following sequence; ITO (180?nm)/N,N'-diphenyl-N,N'-(2-napthyl)-(1,1'-phenyl)-4,4'-diamine (NPB) (50?nm)/emitting materials (30?nm)/4,7-diphenyl-1,10-phenanthroline (Bphen) (30?nm)/Liq/Al (2/100?nm). Particularly, a device using 7,7-dimethyl-7H-indeno[1,2-a]pyrene as emitter showed maximum values of luminous efficiency, power efficiency, and external quantum efficiency of 1.10?cd/A, 0.49?lm/W, 1.47% at 20?mA/cm2, respectively with CIE (x,y) coordinates of (0.15, 0.08) at 6.0V.
Keywords:blue OLED  fluorescence  indeno[1,2-a]arene derivatives  electroluminescence  pyrene
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