Geometry engineering of a multiple resonance core via a phenyl-embedded strategy toward highly efficient narrowband blue OLEDs

作者：Wu, Yimin; Liu, Xiaoyu; Liu, Junjie; Yang, Ge; Han, Songyan; Yang, Dezhi; Cao, Xiaosong; Ma, Dongge; Bin, Zhengyang^*; You, Jingsong^*

来源：Materials Horizons, 2023, 10(9): 3785-3790.

DOI：10.1039/d3mh00617d

The geometry of the molecular skeleton is of importance for the property regulation of organic electronic materials. Herein, we present a phenyl-embedded molecular design strategy to adjust the molecular curvature and achieve the improvement of blue multiple resonance (MR)-emitters. The introduction of a bridged phenyl contributes to a highly twisted saddle skeleton and the separation of frontier molecular orbitals, which are beneficial for the increase of photoluminescence quantum yield (PLQY) as well as the decrease of singlet-triplet energy gap (?E-ST). Consequently, hp-BQAO features an accelerated reverse intersystem crossing rate and suppressed non-radiative decay rate simultaneously, which enables the assembly of high-performance narrowband blue OLEDs with a record-high external quantum efficiency (EQE) of 24.1% for the blue OLED devices exploiting nitrogen-carbonyl-containing MR-emitters without sensitizers.

• 单位
  四川大学