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A deep red phosphorescent Ir(III) complex for use in polymer light-emitting diodes: role of the arylsilyl
Youngmin You1, Cheng-Guo An, Jang-Joo Kim
1Department of Materials Science & Engineering, College of Engineering, Seoul National University, San 56-1, Shillim-Dong, Kwanak-Gu, Seoul 151-744, Korea.
Abstract:
Here we report the synthesis and electrophosphorescence of a new deep-red phosphorescent Ir(III) complex with spatially embracing and thus solubilizing arylsilyl-substituted ligands, Ir(III) tris(2-(2'-benzo[b]thienyl)-5-(4'-triphenylsilylphenyl)pyridinato-N,C3'). A poly(N-vinylcarbazole) (PVK) film doped with this Ir(III) complex exhibited excellent phase homogeneity and showed saturated red electrophosphorescence of 2.7% maximum external quantum efficiency, whose Commission Internationale de L'Eclairage coordinates were (0.69, 0.30).
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