The synthesis and electroluminescent properties of two red Ir(III) complexes based on alkenyl pyridine derivatives, (BzPP)(2)Ir(acac) and (IQP)(2)Ir(acac) are reported. Multilayered, organic light-emitting diodes (OLEDs) were fabricated using (BzPP)(2)Ir(acac) as dopant material. A maximum luminance was 6996 cd/m(2) at 12 V, a maximum luminous and power efficiency were 8.54 cd/A, and 8.16 lm/W, respectively, were achieved. This device showed the deep red emission with the CIE coordinates of (0.66, 0.34) at 10 V.