Smart Design on the Cyclometalated Ligands of Iridium(III) Complexes for Facile Tuning of Phosphorescence Color Spanning from Deep‐Blue to Near‐Infrared. Issue 23 (8th October 2018)

• Record Type: Journal Article
• Authors: Chen, Zhao; Wang, Liqi; Ho, Cheuk‐Lam; Chen, Shuming; Suramitr, Songwut; Plucksacholatarn, Aunyamanee; Zhu, Nianyong; Hannongbua, Supa; Wong, Wai‐Yeung
• Is Part Of: Advanced optical materials. Volume 6:Issue 23(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-10-08
• Subjects: full‐color emission -- iridium complexes -- near‐infrared -- organic light‐emitting diodes -- trifluoromethyl substituent; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201800824
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: It has long been a challenge to achieve iridium(III) complexes with emission colors covering the whole visible and near‐infrared wavelengths, by using similar cyclometalating ligands. Herein, a series of iridium(III) complexes that accomplish broadly tunable phosphorescence from 420 to 729 nm through the use of trifluoromethyl substituents and other conjugated units such as [1, 2, 5]thiadiazolo[3, 4‐ c ]pyridine in the cyclometalating ligands are reported. The peak external quantum efficiencies of 7.1%, 20.0%, 14.0%, 4.0%, and 16.0% are achieved for deep‐blue, green, red, near‐infrared, and white phosphorescent organic light‐emitting diodes, respectively, by using these iridium(III) complexes. Abstract : Full‐color and near‐infrared emissive Ir(III) phosphors : A widely tunable phosphorescence from 420 to 729 nm is achieved by introducing CF3 substituents, π‐conjugated and [1, 2, 5]thiadiazolo[3, 4‐ c ]pyridine moieties into the cyclometalating ligands of Ir(III) complexes. These phosphors afford peak external quantum efficiencies of 7.1%, 20.0%, 14.0%, 4.0% and 16.0% for deep‐blue, green, red, near‐infrared and white phosphorescent organic light‐emitting diodes, respectively.