Cyanocarbazole-substituted di(9H-carbazol-9-yl)-1, 1'-biphenyl derivatives for efficient blue phosphorescent host materials for organic light emitting diodes. Issue 1 (11th February 2022)

• Record Type: Journal Article
• Authors: Woo, Jeongkyu; Han, Ju Hee; Kim, Ki Ju; Moon, Yu Ji; Kim, Young Kwan; Yoon, Seung Soo
• Is Part Of: Molecular crystals and liquid crystals. Volume 734:Issue 1(2022)
• Page Start: 17
• Page End: 24
• Publication Date: 2022-02-11
• Subjects: carbazole derivative -- OLED -- phosphorescent OLED -- triplet energy; Molecular crystals -- Periodicals; Liquid crystals -- Periodicals; Liquid crystals; Molecular crystals; Periodicals; 548
• DOI: 10.1080/15421406.2021.1972210
• Languages: English
• ISSNs: 1542-1406

Abstract

Abstract: To develop the efficient blue phosphorescent host materials for Organic light-emitting Diodes (OLEDs), cyanocarbazole-substituted 3', 5'-di(9 H -carbazol-9-yl)-1, 1'-biphenyl derivatives are designed and synthesized. Multilayer devices were fabricated in the following sequence; ITO (180 nm)/Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) (75 nm)/Blue phosphorescent host materials (15 nm)/Bis[2-(4, 6-difluorophenyl)pyridinato- C 2, N ](picolinato)iridium(III) (Firpic) (15 nm)/1, 3, 5-Tri(m-pyridine-3-ylphenyl)benzene (TmPyPB) (40 nm)/Liq (2 nm)/Al (100 nm). In particularly, blue phosphorescent device using 9-(3', 5'-di(9 H -carbazol-9-yl)-[1, 1'-biphenyl]-4-yl)-9 H -carbazole-3-carbonitrile as a host material exhibited efficient emission with a luminous efficiency, a power efficiency, an external quantum efficiency, and CIE coordinates of 11.6 cd/A, 4.10 lm/W, 5.62% at 20 mA/cm 2, and (0.15, 0.33) at 8 V, respectively.