Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 8, Pages 7339-7346Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b14922
Keywords
self-host; bipolar; TADF; dendrimer; solution process; organic light-emitting diodes
Funding
- National Basic Research Program of China [2013CB932902]
- National Natural Science Foundation of China [51103023, 21173042]
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A self-host thermally activated delayed fluorescence (TADF) dendrimer POCz-DPS for solution-processed nondoped blue organic light-emitting diodes (OLEDs) was designed and synthesized, in which the bipolar phosphine oxide carbazole moiety was introduced by alkyl chain to ensure balanced charge transfer. The investigation of physical properties showed that the bipolar dendrons not only improve the morphological stability but also restrain the concentration quenching effect of the TADF emissive core. The spin-coated OLEDs featuring POCz-DPS as the host-free blue emitter achieved the highest external quantum efficiency (7.3%) and color purity compared with those of doped or nondoped devices based on the parent molecule DMOC-DPS, which indicates that incorporating the merits of encapsulation and bipolar dendron is an effective way to improve the electroluminescent performance of the TADF emitter used for a solution-processed nondoped device.
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