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首页> 外文期刊>Advanced Functional Materials >Highly Efficient Orange and Green Solid-State Light-Emitting Electrochemical Cells Based on Cationic Ir~Ⅲ Complexes with Enhanced Steric Hindrance
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Highly Efficient Orange and Green Solid-State Light-Emitting Electrochemical Cells Based on Cationic Ir~Ⅲ Complexes with Enhanced Steric Hindrance

机译：基于增强型阳离子阻滞的阳离子Ir〜Ⅲ配合物的高效橙色和绿色固态发光电化学电池

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摘要

Highly efficient orange and green emission from single-layered solid-state light-emitting electrochemical cells based on cationic transition-metal complexes [Ir(ppy)_2sb]PF_6 and [Ir(dFppy)_2sb]PF_6 (where ppy is 2-phenylpyridine, dFppy is 2-(2,4-difluorophe-nyl)pyridine, and sb is 4,5-diaza-9,9′-spirobifluorene) is reported. Photoluminescence measurements show highly retained quantum yields for [Ir(ppy)_2sb]PF_6 and [Ir(dFppy)_2 sb]PF_6 in neat films (compared with quantum yields of these complexes dispersed in m-bis(N-carbazolyl)benzene films). The spiroconfigured sb ligands effectively enhance the steric hindrance of the complexes and reduce the self-quenching effect. The devices that use single-layered neat films of [Ir(ppy)_2sb]PF_6 and [Ir(dFppy)_2sb]PF_6 achieve high peak external quantum efficiencies and power efficiencies of 7.1 % and 22.6 lmW~(-1)) at 2.5 V, and 7.1 % and 26.2 lmW~(-1) at 2.8 V, respectively. These efficiencies are among the highest reported for solid-state light-emitting electrochemical cells, and indicate that cationic transition-metal complexes containing ligands with good steric hindrance are excellent candidates for highly efficient solid-state electrochemical cells.
机译：基于阳离子过渡金属配合物[Ir（ppy）_2sb] PF_6和[Ir（dFppy）_2sb] PF_6（其中ppy是2-苯基吡啶，）的单层固态发光电化学电池的高效橙色和绿色发射据报道，dFppy是2-（2,4-二氟苯甲基）吡啶，sb是4,5-二氮杂9,9'-螺二芴。光致发光测量结果表明，[Ir（ppy）_2sb] PF_6和[Ir（dFppy）_2 sb] PF_6在纯净膜中具有高度保留的量子产率（与这些复合物在m-双（N-咔唑基）苯膜中分散的量子产率相比） 。螺旋构型的sb配体可有效增强复合物的空间位阻，并降低自猝灭作用。使用[Ir（ppy）_2sb] PF_6和[Ir（dFppy）_2sb] PF_6单层纯膜的器件在2.5时实现了7.1％和22.6 lmW〜（-1）的高峰值外部量子效率和功率效率。电压为2.8 V时分别为7.1％和26.2 lmW〜（-1）。这些效率是固态发光电化学电池中报道的最高效率，并且表明包含具有良好空间位阻的配体的阳离子过渡金属络合物是高效固态电化学电池的极佳候选者。

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