Trimethylsilane-containing donor-acceptor-donor type material for red fluorescent organic light-emitting diodes

In this paper, we described a donor-acceptor-donor type red fluorescence material, which have the bulky trimethylsilane groups in the donor moieties. To explore the electroluminescence properties of these materials, multilayered OLEDs were fabricated with a device structure of ITO/2-TNATA (60 nm)/NPB (40 nm)/Red 1 (2%):rubrene (50%):Alq3 (30 nm)/Alq3 (60 nm)/Liq (3 nm)/Al (100 nm). A device using Red 1 as the dopant material showed a maximum luminance of 5138 cd/m2 at 12.0 V, maximum luminous efficiencies of 1.62 cd/A, and maximum power efficiencies of 1.04 lm/W. The Commission Internationale de L'Eclairage coordinates of this device was (0.67, 0.33) at 7.0 V, which indicated stable color chromaticity at various voltages.