Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 62, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202300934
Keywords
Conjugate Charge Transfer; Multiple Resonance; Narrowband; Organic Light-Emitting Diodes; Pure-Red
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Although there is a wide range of materials with multiple resonance (MR) in blue to green regions, literature on red-emissive MR emitters is scarce, which needs to be addressed for further applications. In this study, we propose a simple molecular design strategy for constructing pure-red MR emitters through conjugate charge transfer, resulting in a significant redshift of more than 128 nm compared to the selected parent MR core. The proof-of-concept emitter PPZ-BN exhibited a pure-red emission with high efficiency and excellent stability.
Though the flourishment of materials with multiple resonance (MR) in blue to green regions, red-emissive MR emitters are still rare in literatures, which definitely should be resolved for further applications. Herein, we report a simple molecular design strategy for the construction of pure-red MR emitters by conjugate charge transfer, which could greatly enhance the pi-conjugation degree and charge-transfer property of the target molecule while maintaining the basic feature of MR, leading to a significant redshift of more than 128 nm compared to the selected parent MR core. The proof-of-concept emitter PPZ-BN exhibited a pure-red emission with a dominant peak at 613 nm and a small full-width-at-half-maximum of 0.16 eV (48 nm). The optimized organic light-emitting diode showed a high external quantum efficiency of 26.9 %, a small efficiency roll-off, and an excellent operation stability (LT99) of more than 43 hours at an initial luminance of 10 000 cd m(-2).
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