Saturated red iridium(iii) complexes containing a unique four-membered Ir–S–C–N backbone: mild synthesis and application in OLEDs. Issue 4 (23rd December 2019)

• Record Type: Journal Article
• Authors: Lu, Guangzhao; Yao, Jingwen; Chen, Zhanxiang; Ma, Dongge; Yang, Chuluo
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 4(2019)
• Page Start: 1391
• Page End: 1397
• Publication Date: 2019-12-23
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc05806k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Saturated red iridium(iii ) complexes containing a four-membered Ir–S–C–N backbone were mildly prepared and applied in OLEDs. Abstract : A series of new iridium(iii ) cyclometalated complexes (4tfmpiq)2 Ir(tiptha), (4tfmpiq)2 Ir(phdiptha), (4tfmpiq)2 Ir(fphdiptha) and (4tfmpiq)2 Ir(ipdptha) (4tfmpiq = 4-(4-(trifluoromethyl)phenyl)isoquinoline, tiptha = 1, 1, 3-triisopropylthiourea, phdiptha = 1, 1-diisopropyl-3-phenylthiourea, fphdiptha = 3-(4-fluorophenyl)-1, 1-diisopropylthiourea, ipdptha = 3-isopropyl-1, 1-diphenylthiourea) containing a unique four-membered ring Ir–S–C–N backbone were facilely synthesized under mild conditions. By introducing different substituents such as isopropyl, phenyl, 4-fluorophenyl, diisopropylamine and diphenylamine on the thiourea ancillary ligands, not only the S–C–N ligands can be extensively derived, but also the emission colors ( λ peak = 627–636 nm) and photoluminescence quantum efficiencies ( Φ P = 38.0–42.0%) can be regulated. Employing these complexes as emitters, the organic light emitting diodes (OLEDs) exhibited good performances with a maximum external quantum efficiency (EQEmax ) of 13.1% for saturated red emission with CIE coordinates of (0.68, 0.32). These results demonstrate the great potential of the S–C–N ancillary ligands for developing new Ir(iii ) complexes towards OLED applications.