Article ID Journal Published Year Pages File Type
5398960 Journal of Luminescence 2015 6 Pages PDF
Abstract
Highly efficient solution-processed red phosphorescent organic light-emitting devices were developed using 4,4′,4″-tris (N-carbazolyl)-triphenylamine (TCTA) blended with 4,4′-bis-(carbazol-9-yl)biphenyl (CBP) as a mixed-host for the emitting layer. The performances of the fabricated devices made with different mixing ratios of host materials were investigated, and were found to depend on the mixing ratios. Under the optimal TCTA:CBP ratio (3:7), the maximum luminous efficiency of the device reached 19.9 cd/A, corresponding to external quantum efficiency of 11.1%. Moreover, this device with the mixed-host structure shows over 50% enhanced efficiency compared with the device using CBP as the single host. These improvements were attributed to the mixed-host structure, which effectively enhanced the hole injection/transport properties and gave a good charge carrier balance.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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