Deep blue organic light-emitting diode using non anthracene-type fused-ring spiro[benzotetraphene-fluorene] with aromatic wings
作者:Min-Ji Kim、Chil-Won Lee、Myoung-Seon Gong
DOI:10.1016/j.orgel.2014.08.030
日期:2014.11
We prepared three spirobenzotetraphene-based fused-ring spiro[benzo[ij]tetraphene-7,9'-fluorene] (SBTF) derivatives for use in non anthracene-type deep-blue organic light-emitting diode (OLED) hosts. 3-(2-Naphthyl)-10-naphthylspiro[benzo[ij]tetraphene-7,9'-fluorene] (N-NSBTF), 3-[4-(2-naphthyl)phenyl]-10-naphthylspiro[benzo[ij]tetraphene-7,9'-fluorene] (NP-NSBTF), and 3-(phenyl)-10-naphthylspiro[benzo[ij]tetraphene-7,9'-fluorene] (P-NSBTF) were synthesized via multi-step Suzuki coupling reactions. The optimized device structure - ITO/N,N'-bis-[4-(di-m-tolylamino)phenyl]-N,N'-diphenylbiphenyl-4,4'-diamine (DNTPD, 60 nm)/bis[N-(1-naphthyl)-N-phenyl]benzidine (NPB, 30 nm)/NSBTF hosts: LBD (5%) (20 nm)/aluminum tris(8-hydroxyquinoline) (Alq(3), 20 nm)/LiF/Al - was characterized by its blue electroluminescence to have a current efficiency of 6.25 cd/A, a power efficiency of 5.07 lm/W, and an external quantum efficiency of 5.24% at 18.7 mA/cm(2) at CIE coordinates of 0.130, 0.149. (C) 2014 Elsevier B.V. All rights reserved.