Abstract
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, 60nm)/bis[N-(1-naphthyl)-N-phenyl]benzidine (NPB, 30nm)/NSBTF hosts: LBD (5%) (20nm)/aluminum tris(8-hydroxyquinoline) (Alq3, 20nm)/LiF/Al – was characterized by its blue electroluminescence to have a current efficiency of 6.25cd/A, a power efficiency of 5.07lm/W, and an external quantum efficiency of 5.24% at 18.7mA/cm2 at CIE coordinates of 0.130, 0.149.
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