Derivative of oxygafluorene and di-tert-butyl carbazole as the host with very high hole mobility for high-efficiency blue phosphorescent organic light-emitting diodes. (July 2016)

• Record Type: Journal Article
• Authors: Gudeika, Dalius; Volyniuk, Dmytro; Grazulevicius, Juozas V.; Skuodis, Eigirdas; Yu, Sian-Yin; Liou, Wei-Tong; Chen, Li-Yin; Shiu, Yi-Jiun
• Is Part Of: Dyes and pigments. Volume 130(2016)
• Page Start: 298
• Page End: 305
• Publication Date: 2016-07
• Subjects: Oxygafluorene -- Carbazole -- Hole transport -- Host -- Blue electrophosphorescence; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.03.039
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Derivative of oxygafluorene and di- tert -butyl carbazole was synthesized as the host material for high-efficiency blue phosphorescent organic light-emitting diodes. It exhibited moderate thermal stability with 5% weight loss temperature of 337 °C and glass-forming ability with the glass-transition temperature of 65 °C. The solid-state ionization potential of di- tert -butyl carbazolyl-substituted oxygafluorene was found to be 5.54 eV as established by electron photoemission spectrometry. It showed low-dispersity hole transport with time-of-flight hole mobilities of 10 −2 cm 2 V −1 s −1 observed at high electric fields. Blue devices based on the synthesized compound showed high external quantum efficiency up to 16.5% and low efficiency roll-off. Highlights: Derivative of oxygafluorene and di- tert -butyl carbazole was synthesized. The solid sample showed triplet energy of 2.81 eV. The hole mobility reached 10 −2 cm 2 V −1 s −1 at high electric fields. Blue devices showed external quantum efficiency of 16.5%.