Color Tuning of the OLEDs Using the Ir Complexes of White Emission by Adjusting the Band Gap of Host Materials
We have reported white organic light-emitting diodes (WOLEDs) based on single white dopants, Ir(pq)2(F2-ppy) and Ir(F2-ppy)2(pq). It was found that the similar phosphorescent lifetime of two ligands led to emit luminescence in two ligands at die same time and the emission wavelength of single white dopants had a broad peak and emit white color without the intennolecular energy transfer. The configuration of fabricated WOLEDs was 4,4, 4-tris 2-naphthylphenylaminotriphenyl-amine (2-TNATA) (60 nm)/4, 4-bisN-(naphthyl)-Af-phenyl-amino biphenyl (NPB) (20 nm)/ 10％ IT complex doped in 4, 4, N, N-dicarbazolebiphenyl (CBP) (30 nm )/bathocuproine (BCP) (10 nm )/tris-( 8hydroxyquinoline) aluminum (Alq3) (20 mn)/lithium quinolate (Liq) (2 nm)/Al (100 nm), where Ir(pq)2(F2ppy) and Ir(F2-ppy)2(pq) were used as white dopant, respectively. However, emission color of fabricated devices was reddish because the energy was not transferred efficiently from the CBP to the F2-ppy tigand due to the small band gap of the CBP. Therefore, we used 1, 4-phenylenesis (triphenylsilane) (UGH2) of large band gap instead of CBP as host material. As a result, high efficient OLED of white emission was fabricated for device with h-(F2-ppy)2(pq). Furthermore, The luminous efficiency of device with Ir(F2-ppy)2(pq) doped in UGH2 was about 11 cd/A at 0.06 cd/m2.
White Organic Light-Emitting Diodes Single White Dopant Ir(pq)2(F2-ppy) Ir(F2-ppy)2(pq)
J. H. Seo G. W. Hyung J. H. See J. H. Kim Y. H. Lee Y. S. Kim Y. K. Kim
Department of Display, Hongik University, Seoul, 121 -791, Korea;Center for Organic Materials and In Department of Display, Hongik University, Seoul, 121 -791, Korea;Department of Materials Science and Center for Organic Materials and Information Devices,Hongik University, Seoul, 121 -791, Korea;Depar
国际会议
上海
英文
1489-1493
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）