Blue electroluminescence from homoleptic Ir(III) carbene phosphors and peripheral decorated multiple resonance boron emitters

Jie Yan, Takeru Nakamura, Xiaolan Tan, Shek-Man Yiu, Ryunosuke Mimura, Keigo Hoshi, Xiuwen Zhou*, Yun Chi*, Hisahiro Sasabe*, Junji Kido*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

9 Citations (Scopus)

Abstract

Blue phosphors are indispensable in constructing organic light-emitting diodes (OLEDs). Herein, we reported two Ir(III) complexes, namely f-CN1 and f-CN2, with asymmetrically arranged benzo[d]imidazolylidenes, to which the peri-cyano substituent has concurrently induced both the selective aryl cyclometalation and emission tuning in giving one single blue Ir(III) phosphor. With the aforementioned ‘one stone for two birds’ tactics, these carbene complexes exhibited photoluminescent peak (λmax) at ∼472 nm and excellent quantum yields (83–100 %) in doped thin films. Consequently, the fabricated OLED devices delivered maximum external quantum efficiencies (EQEmax) of 23.6 % and 20.2 %, respectively. Furthermore, hyper-OLED devices with f-CN1 and multi-resonant TADF terminal emitter m-DiNBO displayed an EQEmax of 30.8 % with CIEx,y coordinates of (0.13, 0.10), together with impressive EQE of 26.9 % at practical brightness of 100 cd m−2. © 2024 Elsevier B.V.
Original languageEnglish
Article number150791
JournalChemical Engineering Journal
Volume488
Online published28 Mar 2024
DOIs
Publication statusPublished - 15 May 2024

Funding

Funding and research grants of this work are provided by the University Grants Council (N_CityU102/19, CityU 11304221 and CityU 11312722) for Y.C, while XZ is a recipient of Discovery Early Career Researcher Award (ARC DECRA DE190100144) from Australian Research Council. H.S. acknowledges the partial financial support provided by JSPS KAKENHI (grant number 23H02032).

Research Keywords

  • Carbene
  • Cyclometalate
  • Hyperfluorescence
  • Hyperphosphorescence
  • Iridium
  • Organic light-emitting diodes

Fingerprint

Dive into the research topics of 'Blue electroluminescence from homoleptic Ir(III) carbene phosphors and peripheral decorated multiple resonance boron emitters'. Together they form a unique fingerprint.

Cite this