Abstract Despite the potential candidates of NIR emissive cyclometalated Ir(III)-complexes for large-area and scalable NIR-PLEDs, the realization of their all-solution-processed devices with low cost and without sacrifice of satisfactory performance, is much challenging. In this work, using Hiqbt (1-(benzo[b]-thiophen-2-yl)-isoquinoline) as the C^N1 main ligand and Br-Hppy (2-(4-bromophenyl)pyridine) as the C^N2 ancillary ligand, the [Ir(C^N1)2(C^N2)]-heteroleptic complex [Ir(iqbt)2(Br-ppy)] with efficient NIR-phosphorescence (λem = 692 nm; 69% of the λem ≥ 700 nm proportion; τ = 0.48 μs and ΦPL = 0.19) was molecularly designed. Meanwhile, through the doping of the Ir(III)-complex [Ir(iqbt)2(Br-ppy)], its TmPyPB-assisted (TmPyPB = (1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene) multi-layer NIR-PLED-I and all-solution-processed NIR-PLED-II were realized, respectively. Saliently, the attractive performance (ηEQEMax = 3.20% and negligible (ca. 5%) efficiency roll-off) of the NIR-PLED-II, renders [Ir(C^N1)2(C^N2)]-heteroleptic Ir(III)-complexes a new platform to all-solution-processed NIR-PLEDs.

中文翻译：

---

基于 [Ir(CˆN )2(CˆN2)]-杂配 Ir(III)-复合物 [Ir(iqbt)2(Br-) 的高效全溶液处理近红外 (NIR) 聚合物发光二极管 (PLED) ppy)]

摘要 尽管用于大面积和可扩展 NIR-PLED 的 NIR 发射环金属化 Ir(III) 配合物的潜在候选者，但以低成本和不牺牲令人满意的性能实现其全溶液处理的器件仍然具有很大的挑战性。在这项工作中，使用 Hiqbt（1-（苯并[b]-噻吩-2-基）-异喹啉）作为 C^N1 主要配体，使用 Br-Hppy（2-（4-溴苯基）吡啶）作为 C^N2辅助配体，[Ir(C^N1)2(C^N2)]-杂配复合物 [Ir(iqbt)2(Br-ppy)]，具有高效的 NIR 磷光（λem = 692 nm；λem 的 69% ≥ 700 nm 比例；τ = 0.48 μs 和 ΦPL = 0.19）是分子设计的。同时，通过掺杂 Ir(III)-复合物 [Ir(iqbt)2(Br-ppy)]，其 TmPyPB 辅助 (TmPyPB = (1,3,5-tri[(3-pyridyl)-phen- 3-yl]苯）多层 NIR-PLED-I 和全溶液处理 NIR-PLED-II 的实现，分别。值得注意的是，NIR-PLED-II 的有吸引力的性能（ηEQEMax = 3.20% 和可忽略不计（约 5%）的效率滚降）呈现 [Ir(C^N1)2(C^N2)]-heteroleptic Ir( III)-为全溶液处理的 NIR-PLED 集成了一个新平台。