Lite Version|Standard version

To gain access to this content please
Log in via your home Institution.
Log in with your member or subscriber username and password.
Download

In this study, two isomers, namely 2P-BT-N-2TPA and 2TPA-BT-N-2P, have been designed and synthesized with hybridized local and charge transfer (HLCT) properties. 2TPA-BT-N-2P has been found to have not only stronger intra/intermolecular interactions with regular molecular packing, which stabilized the excited-state configuration, but also aggregation-induced emission enhancement (AIEE) properties. The AIEE properties can effectively inhibit the aggregation-caused quenching (ACQ) effects in the aggregation state and its photoluminescence quantum yield (PLQY) is up to 91%, which is extremely high in a solid-state film. When 2TPA-BT-N-2P is applied as a dopant to form a doped OLED, the device exhibited an excellent external quantum efficiency (EQE) of 6.6%, with an emission peak of 588 nm. Moreover, when 2TPA-BT-N-2P is applied as a pure emitting layer to form a non-doped OLED, the device still achieved an EQE of 5.8% and 5.1% at 100 cd m−2 and 1000 cd m−2, respectively, with the lowest efficiency roll-off currently reported from the HLCT molecule in the orange emission.

Graphical abstract: Nondoped organic light-emitting diodes with low efficiency roll-off: the combination of aggregation-induced emission, hybridized local and charge-transfer state as well as high photoluminescence efficiency

Page: ^ Top