714 nm emission with 12.25% efficiency from iridium complexes with low iridium content by the strategy of rigid coordination core and amplifying shell

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

6 Scopus Citations
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Author(s)

  • Li Wang
  • Sai Wang
  • Caifa You
  • Xiang Chang
  • Jingwei Huang
  • And 5 others
  • Weiqiong Zhen
  • Hu Zhang
  • Xiangqin Gan
  • Xiugang Wu
  • Weiguo Zhu

Detail(s)

Original languageEnglish
Pages (from-to)6646-6653
Journal / PublicationJournal of Materials Chemistry C
Volume10
Issue number17
Online published30 Mar 2022
Publication statusPublished - 7 May 2022

Abstract

The development of near-infrared (NIR)-emitting phosphorescent emitters are still urgently needed for solution-processed organic light-emitting diodes (SP-OLEDs) with high efficiency, radiant emittance, and low cost. Herein, we designed and synthesized a new iridium complex, namely (tBuTPA-DBPz)2Ir(acac), with the rigid C^N coordinated core of dibenzo[a,c] phenazine (DBPz) and an amplifying peripheral shell of 4,4 '-di(tert-butyl)-triphenylamine (tBuTPA) attached at its 3,6-positions. The influence of the rigid DBPz core and big tBuTPA shell on the photophysical, electrochemical and electroluminescent properties of (tBuTPA-DBPz)2Ir(acac) was primarily studied in comparison with the archetype (DBPz)2Ir(dpm). The NIR emission peaked at 714 nm with an outstanding external quantum efficiency of 12.25% and a recorded radiant emittance of 45 330 mW Sr-1 m-2 was observed in the (tBuTPA-DBPz)2Ir(acac)-doped devices at an optimized dopant ratio of 8 wt%. The EQE is 1.57 times that of (DBPz)2Ir(dpm)-doped devices. Moreover, this NIR light-emitting device contains an Ir(III) content as low as 0.68 wt% and exhibits a bright NIR emission at 714 nm with outstanding efficiency and radiant emittance. Our results indicate that the NIR-emitting OLEDs with high efficiency, radiant emittance and low cost should be realized by developing core-shell type Ir(III) complexes with a rigid C^N coordinate core and an amplifying shell.

Research Area(s)

  • NEAR-INFRARED EMISSION, LIGHT-EMITTING-DIODES, DINUCLEAR PLATINUM COMPLEXES, DEEP-RED, ELECTROLUMINESCENT PROPERTIES, OS(II) PHOSPHORS, ROLL-OFF, SALOPHEN, ISOQUINOLINE

Citation Format(s)

714 nm emission with 12.25% efficiency from iridium complexes with low iridium content by the strategy of rigid coordination core and amplifying shell. / Wang, Li; Wang, Sai; You, Caifa et al.
In: Journal of Materials Chemistry C, Vol. 10, No. 17, 07.05.2022, p. 6646-6653.

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