4.6 Article

Iridium(III) Complexes with [-2,-1,0] Charged Ligand Realized Deep-Red/Near-Infrared Phosphorescent Emission

期刊

CHEMISTRY-A EUROPEAN JOURNAL
卷 28, 期 2, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202103543

关键词

charged ligands; iridium(III) complexes; near-infrared emission; organic light-emitting diodes; phosphorescence

资金

  1. National Natural Science Foundation of China [51903157, 51903158, 22171109]
  2. Shenzhen Science and Technology Program [KQTD20170330110107046, JCYJ20190808151209557]
  3. China Postdoctoral Science Foundation Funded Project [2017 M622748, 2019T120747]

向作者/读者索取更多资源

A series of iridium(III) complexes based on [-2, -1, 0] charged ligands were designed and synthesized with excellent thermal stability and deep red/near infrared emission. By introducing electron-donating or -withdrawing groups, the photophysical properties of these complexes were improved, leading to organic light-emitting diodes with acceptable external quantum efficiency and low turn-on voltage. This work provides new opportunities and challenges for the optoelectronic applications of iridium(III) emitters with different valence states.
A series of [-2, -1, 0] charged-ligand based iridium(III) complexes of [Ir(bph)(bpy)(acac)] (1), [Ir(bph)(2MeO-bpy)(acac)] (2), [Ir(bph)(2CF(3)-bpy)(acac)] (3), [Ir(bph)(bpy)(2(t)Bu-acac)] (4) and [Ir(bph)(bpy)(CF3-acac)] (5), which using biphenyl as dianionic ligand [-2], acetylacetone (or its derivatives) as monoanionic ligand [-1], and 2,2 '-bipyridine (or its derivatives) as neutral ligand [0] were designed and synthesized. The chemical structures were well characterized. All of the ligands have simple chemical structures, thus further making the complexes have excellent thermal stability and are easy to sublimate and purify. Phosphorescent characteristics with short emission lifetime were demonstrated for these emitters. Notably, all of the complexes exhibit remarkable deep red/near infrared emission, which is quite different from the reported [-1, -1, -1] charged-ligand based iridium(III) complexes. The photophysical properties of these complexes are regularly improved by introducing electron-donating or -withdrawing groups into [-1] or [0] charged-ligand. The related organic light-emitting diodes exhibited deep red/near infrared emission with acceptable external quantum efficiency and low turn-on voltage (<2.6 V). This work provides a new idea for the construction of new type phosphorescent iridium(III) emitters with different valence states of [-2, -1, 0] charged ligands, thus offering new opportunities and challenges for their optoelectronic applications.

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