A morphologically stable host material for efficient phosphorescent green and red organic light emitting devices

作者：Ho Meng Huan^*; Balaganesan Banumathy; Chu Ta Ya; Chen Teng Ming; Chen Chin H

来源：Thin Solid Films, 2008, 517(2): 943-947.

DOI：10.1016/j.tsf.2008.07.005

• Organic electroluminescent devices
• Phosphorescence
• Host material
• Carbazole

A carbazole-based host material, 4,4'-N,N'-[di(3, 6-di(t-butyl)carbazole]biphenyl (ttbCBP), with four t-butyl steric spacers on peripheral carbazole moieties was effectively synthesized through Friedel-Crafts Alkylation. Owing to the presence of sterically hindered t-butyl groups, ttbCBP exhibits a high glass transition temperature (175 degrees C) and is morphologically stable. This host material also preserves the characteristics of wide band-gap of 3.2 eV and high triplet energy of 2.64 eV. In addition, ttbCBP has been shown to be effective hosts for green and red phosphorescent emitters in organic electrophosphorescent devices.

• 出版日期2008-11-28