Rational design of anthracene-based deep-blue emissive materials for highly efficient deep-blue organic light-emitting diodes with CIEy ≤ 0.05

Abstract

By using molecular twisting 2,2′-dimethylbiphenyl core and different side group substitutions, three anthracene-based deep blue emitters, 10,10'-(2,2′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)bis(9-phenylanthracene) (PABP), 10,10'-(2,2′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)bis(9-(naphthalen-2-yl)anthracene) (βNABP) and 10,10'-(2,2′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)bis(9-(naphthalen-1-yl)anthracene) (αNABP), were effectively developed. These three twisted anthracene derivatives exhibited strong deep blue photoluminescence which remarkably surpassed the standard blue for the high-definition television (HDTV). Particularly, PABP with high hole mobility of 1.67 × 10−5 cm2 V−1 s−1 delivered a high OLED device performance with external quantum efficiency (EQE) of 4.04% and deep blue emission colour with CIE coordinates of (0.15, 0.05).