Blue electroluminescent materials based on indeno[1,2-a]arene derivatives for Organic Light-Emitting Diodes

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

Acknowledgment

This research was supported by Samsung display.