4.7 Article

A zig-zag type bidibenzofuran based host material for green phosphorescent organic light-emitting diodes

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DYES AND PIGMENTS
卷 114, 期 -, 页码 278-282

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ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2014.12.001

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Bidibenzofuran; Carbazole modification; Green device; High efficiency; Phosphorescent device; Triplet energy

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A zig-zag type carbazole modified bidibenzofuran compound, 2,2'-di(carbazol-9-yl)-4,4'-bidibenzo[b,d]furan, was synthesized as the host material for green phosphorescent organic light-emitting diodes by coupling two 9-(dibenzo[b,d]furan-2-yl)carbazole moieties via 4- position of dibenzofuran. The carbazole modified bidibenzofuran host showed a triplet energy of 2.75 eV and the highest occupied molecular orbital/the lowest unoccupied molecular orbital of -6.10 eV/-2.87 eV for hole and electron injection. The bidibenzofuran host was doped with green emitting tris(2-phenylpyridine) iridium and high quantum efficiency of 20.6% was achieved in the green phosphorescent organic light-emitting diodes. (C) 2014 Elsevier Ltd. All rights reserved.

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