Luminescent Diiridium Complexes with Bridging Pyrazolates : Characterization and Fabrication of OLEDs Using Vacuum Thermal Deposition

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Jia-Ling Liao
  • Palanisamy Rajakannu
  • Premkumar Gnanasekaran
  • Shang-Ru Tsai
  • Chun-Han Lin
  • Shih-Hung Liu
  • Chih-Hao Chang
  • Gene-Hsiang Lee
  • Pi-Tai Chou
  • Zhong-Ning Chen

Detail(s)

Original languageEnglish
Article number1800083
Journal / PublicationAdvanced Optical Materials
Volume6
Issue number11
Online published25 Mar 2018
Publication statusPublished - 5 Jun 2018

Abstract

A series of novel diiridium complexes (1-4) bearing both functional 2-pyrazolyl-6-phenyl pyridine chelate and bidentate phenyl imidazolylidene chelate are synthesized, for which the pyrazolate fragment of the tridentate 2-pyrazolyl-6-phenyl pyridine also behaves as the bridge to hold two iridium atoms in close vicinity. Their structure is unambiguously confirmed using X-ray structure determination on the corresponding derivative 2a bearing 1,3-bis(4-fluorophenyl)-1H-Imidazolyl cyclometalate. Their photophysical and electrochemical properties are studied and further affirmed by the computational approaches. All these Ir(III) metal complexes 1-4 are very stable in both solution and solid film with near unity emission quantum efficiency. As opposed to most of diiridium complexes documented in literature, 1-4 are volatile and suitable for fabrication of organic light emitting diodes (OLEDs) under vacuum evaporation. The corresponding electroluminescent devices exhibit superior performance, among which external quantum efficiency of 27.6% using 2 as dopant stands for the record high of OLEDs using dinuclear Ir(III) complexes. They also offer a low roll-off at high luminance, demonstrating their potential en route to high performance OLEDs.

Research Area(s)

  • Carbene, Diiridium complexes, Organic light emitting diodes, Pyrazolates, Tridentate chelates

Citation Format(s)

Luminescent Diiridium Complexes with Bridging Pyrazolates : Characterization and Fabrication of OLEDs Using Vacuum Thermal Deposition. / Liao, Jia-Ling; Rajakannu, Palanisamy; Gnanasekaran, Premkumar; Tsai, Shang-Ru; Lin, Chun-Han; Liu, Shih-Hung; Chang, Chih-Hao; Lee, Gene-Hsiang; Chou, Pi-Tai; Chen, Zhong-Ning; Chi, Yun.

In: Advanced Optical Materials, Vol. 6, No. 11, 1800083, 05.06.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review