Efficient deep-blue emitters based on triphenylamine-linked benzimidazole derivatives for nondoped fluorescent organic light-emitting diodes |
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Authors: | Seongjin Jeong Myoung-Ki KimSung Hyun Kim Jong-In Hong |
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Affiliation: | Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-747, Republic of Korea |
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Abstract: | Two triphenylamine-substituted benzimidazole derivatives were synthesized for use as efficient deep-blue emitters in nondoped fluorescent organic light-emitting diodes (FLOLEDs). The molecular design of 4′,4′′-(1H-benzo[d]imidazole-1,2-diyl)bis(N,N-diphenylbiphenyl-4-amine) (T2B) to limit the molecular packing density enabled T2B-based devices to suppress the exciton quenching by a bulky three-dimensional structure. Nondoped FLOLEDs fabricated using T2B as a blue emitter exhibited an external quantum efficiency of 4.67% with color coordinates of (0.15, 0.08). |
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Keywords: | Deep-blue emitter Fluorescent organic light-emitting diodes Nondoped system Packing density |
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