Effective bipolar hosts preparedviadipole moment engineering for phosphorescent emitters and white OLEDs

Abstract

Efficient host material with bipolar charge transporting character has still attracted much attention by both academic and industrial communities. In this contribution, dipole moment engineering is proposed to renovate the...

Integration of a bulky adamantane unit with 9-phenyl-9H-3,9′-bicarbazole: a novel host design for solution-processed narrowband TADF-OLEDs

“…Therefore, developing excellent materials for solution-processable TADF-OLEDs requires molecules with low crystallinity, superior thermal stability, excellent film-forming capabilities, and compatibility with emitters. [23][24][25][26] Traditionally, materials designed by combining various aromatic and heteroaromatic moieties have been utilized as hosts and emitters in the EML of OLEDs. 27 Specifically, host materials for blue emitters are composed of molecules with a simple conjugated structure to achieve high T 1 energy.…”

High-efficiency all fluorescence white OLEDs with high color rendering index by manipulating excitons in co-host recombination layers

“…[21][22][23] Lots of strategies using materials such as bipolar host materials, exciplex host materials, and TADF host materials are proposed to reduce the driving voltages and extend recombination zones. 21,24 Recently, taking advantage of the bipolar characteristics of TADF materials, some TADF devices with neat TADF emitting layers have been reported to reduce driving voltages. However, these molecules need to conquer the challenge of aggregate quenching and the available emitters are rare.…”