A novel cross‐linkable electron‐transport material has been designed and synthesized for use in the fabrication of solution‐processed OLEDs. The material exhibits a low LUMO level of −3.51 eV, a high electron mobility of 1.5×10 −5 cm 2 V −1 s −1 , and excellent stability. An average 9.3 % shrinkage in film thickness was observed for the film after thermal curing. A maximum external quantum efficiency (EQE) of 15.6 % (35.0 cd A −1 ) was achieved for blue‐phosphorescent OLEDs by spin‐coating and 13.8 % (31.0 cd A −1 ) for an ink‐jet‐printed device, both of which are better than the EQE of a control device prepared by vacuum‐deposition (see figure).
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Wei et al. (2016) studied this question.
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