High stability light-emitting electrochemical cells from cationic iridium complexes with bulky 5,5′ substituents
High stability light-emitting electrochemical cells from cationic iridium complexes with bulky 5,5′ substituents
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DOI：
10.1039/c1jm12984h
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发表时间：
2011-11
影响因子：
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通讯作者：
Liangfeng Sun;A. Galan;Sébastien Ladouceur;J. Slinker;E. Zysman‐Colman
中科院分区：
文献类型：
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作者：
Liangfeng Sun;A. Galan;Sébastien Ladouceur;J. Slinker;E. Zysman‐Colman
研究了离子型过渡金属配合物[（ppy）2 Ir（bpy*）]（PF 6）（ppyH为2-苯基吡啶，bpy* 为5，5 ′-二芳基-2，2 ′-联吡啶）的电子物理、电化学和电致发光性质. ITO/[（ppy）2 Ir（bpy*）]（PF 6）/Au结构的单层器件表现出高稳定性，在-4 V偏压下半衰期约为100 h。长寿命是通过芳基取代基的大体积性质实现的，其用于限制发色团-发色团自猝灭，并且这些大体积基团的5，5 '定位明显有利于器件性能。
We explore the photophysical, electrochemical, and electroluminescent properties of the ionic transition metal complex [(ppy)2Ir(bpy*)](PF6) where ppyH is 2-phenylpyridine and bpy* is 5,5′-diaryl-2,2′-bipyridine. Single layer devices of the structure ITO/[(ppy)2Ir(bpy*)](PF6)/Au exhibited high stability, with half-lives on the order of 100 h at a bias of −4 V. Long lifetimes are achieved through the bulky nature of the aryl substituents, which serves to limit chromophore–chromophore self-quenching, and 5,5′ positioning of these bulky groups is clearly advantageous for device performance.