Synthesis and Electro-Optical Properties of Adamantane-Based Host and Hole-Transporting Material for Thermal Stable Blue Phosphorescent OLEDs
作者:Sungkoo Lee、Min Hye Seo
DOI:10.1166/jnn.2017.14749
日期:2017.10.1
New host/hole-transporting material, namely 9,9'-5-[(3r,5r,7r)-adamantan-1-yl]-1,3-phenylene} bis(9H-carbazole) (ad-mCP) and N-4-(3-((3r,5r,7r)-adamantan-1-yl) phenyl)-N-4'-(3-((2R, 5S, 6as)hexahydro- 2,5-methanopentalen-3a(1H'-yl) phenyl)-N-4'N-4'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (ad-TPD), were designed and synthesized by introducing rigid adamantane unit into 1,3-Bis(N-carbazolyl) benzene and N-4'(NN4)-N-4'', N4'-tetraphenyl-[1,1'-biphenyl]-4,4'-diamine via a Suzuki coupling reaction. Thermal, photophysical, and electrochemical properties of ad-mCP and ad-TPD were investigated. Using adamantane unit leads to enhance thermal stability. Phosphorescent organic light-emitting diodes constructed using ad-mCP emitting layer and ad-TPD hole transporting layer produce bright blue emissions with a high maximum current efficiency of 7.0 cd/A.