The weak stability of a hole-transporter upon approaching the anion state is one of the major bottlenecks for developing long-life organic light-emitting devices (OLEDs). Therefore, in this study, we developed a series of thermally and electrically stable hole-transporters that are end-capped with four dibenzofuran units. These materials exhibit i) high bond dissociation energy (BDE) toward the anion state, ii) a high glass transition temperature (T >130 °C), and iii) high triplet energy (E >2.7 eV), thereby enabling approximately 20 % high external quantum efficiency (EQE) and significantly prolonging the stability of both thermally activated delayed fluorescent (TADF) and phosphorescent OLEDs with an operation lifetime at 50 % (LT ) of 20 000-30 000 h at 1000 cd m . In addition, investigating their structure-property relationship revealed that ionization potential (I ), BDE, and T are critical prerequisites for the hole-transporter to prolong lifetime in OLEDs.

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