A novel furo[3,2-c] pyridine-based iridium complex for high-performance organic light- emitting diodes with over 30% external quantum efficiency
A novel furo[3,2-c] pyridine-based iridium complex for high-performance organic light- emitting diodes with over 30% external quantum efficiency
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A%20新颖%20furo[3,2-c]%20吡啶基%20铱%20复合物%20for%20高性能%20有机%20light-%20发射%20二极管%20with%20over%2030%%20外部%20量子%20效率
DOI：
10.1039/c7tc03937a
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发表时间：
2017
影响因子：
6.4
通讯作者：
Wang Lixiang
中科院分区：
文献类型：
--
作者：
Yan Zhimin;Wang Yanping;Wang Jiaxiu;Wang Yue;Ding Junqiao;Wang Lixiang
通过用 C^N 配体中的氧取代硫，开发了一种新型呋喃并[3,2-c]吡啶基 Ir 配合物，即 (pfupy)2Ir(acac)。与含噻吩的(pthpy)2Ir(acac)相比，所得含呋喃的(pfupy)2Ir(acac)的LUMO能级升高，而HOMO能级几乎保持不变。结果，发射最大值从 (pthpy)2Ir(acac) 的 556 nm 蓝移到 (pfupy)2Ir(acac) 的 538 nm，同时光致发光量子产率提高到 0.80。基于(pfupy)2Ir(acac)的相应器件在没有任何外耦合技术的情况下实现了创纪录的30.5% (110.5 cd A−1)外量子效率(EQE)。即使在 1000 和 5000 cd m−2 的亮度下，EQE 仍然分别保持在 26.6% (96.4 cd A−1) 和 25.6% (92.7 cd A−1)，表明效率缓慢下降。结果清楚地表明了呋喃基功能材料在OLED中应用的巨大潜力。
A novel furo[3,2-c]pyridine based Ir complex, namely (pfupy)2Ir(acac), has been developed by replacing sulfur with oxygen in the C^N ligand. Compared with the thiophene-containing (pthpy)2Ir(acac), the LUMO level is elevated while the HOMO level remains almost unchanged for the resultant furan-containing (pfupy)2Ir(acac). As a consequence, the emissive maximum is blue-shifted from 556 nm of (pthpy)2Ir(acac) to 538 nm of (pfupy)2Ir(acac) together with an improved photoluminescence quantum yield of 0.80. The corresponding device based on (pfupy)2Ir(acac) realizes a record-high external quantum efficiency (EQE) of 30.5% (110.5 cd A−1) without any out-coupling technology. Even at a luminance of 1000 and 5000 cd m−2, the EQE still remains at 26.6% (96.4 cd A−1) and 25.6% (92.7 cd A−1), respectively, indicative of the gentle efficiency roll-off. The results clearly demonstrate the great potential of furan-based functional materials applied in OLEDs.