The authors have demonstrated white oraganic light-emitting diodes (WOLED) using 1,4-bis[2-(4'-diphenylaminobiphenyl-4-yl)vinyl]benzene as fluorescent blue emitter and iridium(III) bis(5-acetyl-2-phenylpyridinato-N,C2') acetylacetonate as phosphorescent red emitter. The optimized WOLED using red host material as bis(2-methyl-8-quinolinato) -4-phenylphenolate exhibited proper color stability in comparison with the control device using 4,4'-N,N'-dicarbazole-biphenyl as red host. The white device showed a maximum luminance of 21100 cd/m2 at 14 V, luminous efficiency of 9.7 cd/A at 20 mA/cm2, and Commission Internationale de I'Eclairage (CIEx,y)coordinates of (0.32, 0.34) at 1000 cd/m2. The devices also exhibited the color shift with δCIEx,y coordinates of ± (0.01,0.01) from 100 to 20000 cd/m2.

• Ji-Hoon Seo
• Jung-Sun Park
• Ja-Ryong Koo
• Bo-Min Seo
• Kum-Hee Lee
• Seung-Soo Yoon
• Young-Kwan Kim