Anthracene-dibenzofuran based electron transport type hosts for long lifetime multiple resonance pure blue OLEDs

Abstract

In this work, we report two simple and efficient electron transport (ET) type host materials, namely 2-(3-(10-phenylanthracen-9-yl)-phenyl)dibenzo[b,d]furan (m-PPDF) and 2-(4-(10-phenylanthracen-9-yl)phenyl)dibenzo[b,d]furan (p-PPDF) based on 9,10-diphenylanthracene and dibenzofuran moieties. The designed host materials show excellent thermal stability with thermal decomposition temperature (Td) above 351 °C. The computational studies and carrier transport analysis proved good electron-transporting features of these hosts. The synthesized materials were utilized as hosts for multiple resonance emitters (DABNA-NP-TB) based blue OLEDs. The fabricated OLED device based on p-PPDF host and DABNA-NP-TB dopant shows a high external quantum efficiency (EQE) of 7.03% with a narrow spectrum in deep blue color and Commission International de l’Eclairage (CIE) coordinate of (0.136, 0.076). Further, the operational lifetime at 95% initial luminescence decay (LT 95 ) of the p-PPDF based host device shows 85 h at 600 cd/m 2 , which is increased by 1.7 times compared with the well-known bipolar host (PhPC). Further, we analyzed that such a long lifetime is attributed to the improved stability of electron transfer type-designed hosts. • We report long lifetime fluorescent host materials. • Anthracene-dibenzofuran core host for multi-resonance blue emitter. • EQE of 7.03%, CIE of (0.136, 0.076) and 85h(LT 95 ) at 600nit are reported.