Citation: YANG Ting-Ting, XU Hui-Xia, WANG Hua, MIAO Yan-Qin, DU Xiao-Gang, JING Shu, XU Bing-She. Synthesis and Photoelectric Properties of a New Phosphorescent Host Material Based on Carbazole[J]. Acta Physico-Chimica Sinica, ;2013, 29(06): 1351-1356. doi: 10.3866/PKU.WHXB201303281
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A new phosphorescent host material based on 9-[6-(9H-carbazol-9-yl)hexyl]-9H-carbazole (hCP) was designed and synthesized and its structure and properties were characterized. These investigations indicated that hCP possessed a twisted rigid structure, with the two carbazole units in a non-coplanar conformation leading to a higher triplet energy level (3.01 eV). hCP also possessed a high glass transition temperature (93℃). Electroluminescent devices were fabricated by doping the hCP host with the green- phosphorescent fac-tris(2-phenylpyridine)iridium(III) (Ir(ppy)3) as the light-emitting layer. Compared with devices employing the typical (4,4'-N,N'-dicarbazole)biphenyl) (CBP) as a host, the hCP host showed a 34.8% increase of current efficiency to 15.1 cd·A-1.
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