Issue 9, 2023

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

Abstract

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 (ΔEST). 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.

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

Supplementary files

Article information

Article type
Communication
Submitted
24 Apr 2023
Accepted
28 Jun 2023
First published
28 Jun 2023

Mater. Horiz., 2023,10, 3785-3790

Author version available

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

Y. Wu, X. Liu, J. Liu, G. Yang, S. Han, D. Yang, X. Cao, D. Ma, Z. Bin and J. You, Mater. Horiz., 2023, 10, 3785 DOI: 10.1039/D3MH00617D

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