Anthracene derivatives as highly efficient deep-blue emitters with extremely low driving voltages, Von ≤2.7 V

Abstract

In this work, we report a feasible and versatile method to synthesize bis(N1, N1, N3, N3-tetraphenylbenzene-1,3-diamine) (TPDA) group as a donor group for OLEDs. A series of novel tetraphenyl-diamine-phenyl end-capped anthracene derivatives, 5-(anthracene-9-yl)-N1, N1, N3, N3-tetraphenylbenzene-1,3-diamine (TPDAAn), N1, N1, N3, N3-tetraphenyl-5-(10-phenylanthracen-9-yl)benzene-1,3-diamine (TPDAPhAn), 5,5'-(anthracene-9,10-diyl)bis(N1, N1, N3, N3-tetraphenylbenzene-1,3-diamine) (dTPDAAn) were synthesized through a facile route. The doped devices based on TPDAAn, TPDAPhAn and dTPDAAn exhibit high EQE up to 4.01% and deep-blue emission with CIE coordinates of (0.15, 0.05), which fully meet the requirements of European Broadcasting Union (EBU) standard blue CIE coordinates of (0.15, 0.06). The non-doped devices based on TPDAAn and TPDAPhAn also display efficient deep-blue emission with CIEy coordinates of 0.08, matching very well with the National Television System Committee (NTSC) standard blue CIEy coordinate for display applications. More importantly, the non-doped devices show extremely low driving voltages (Von ≤ 2.7 V), making them one of the lowest driving voltage devices with CIEy ≤ 0.8.