Iridium(III) Complexes with [−2, −1, 0] Charged Ligand Realized Deep‐Red/Near‐Infrared Phosphorescent Emission
Iridium(III) Complexes with [−2, −1, 0] Charged Ligand Realized Deep‐Red/Near‐Infrared Phosphorescent Emission
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铱(III)与[−2,−1,0]带电配体的配合物实现深红/近红外磷光发射
DOI：
10.1002/chem.202103543
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Chuluo Yang
中科院分区：
文献类型：
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作者：
Youming Zhang;Hao‐Che Kao;Chao Shi;Chengjun Wu;Minrong Zhu;Kai Li;Chung‐Chih Wu;Chuluo Yang
以联苯为双阴离子配体[- 2]，乙酰丙酮（或其衍生物）为单阴离子配体[- 1]，以2,2,−1,0]带电配体为基的铱（III）配合物[Ir(bph)(bpy)(acac)] (2), [Ir(bph)(2CF3‐bpy)(acac)] (3), [Ir(bph)(bpy)(2tBu‐acac)](4)和[Ir(bph)(bpy)(CF3‐acac)](5)，设计并合成了一系列[Ir(bph)(bpy)(CF3‐acac)](2), 2,2′‐联吡啶（或其衍生物）为中性配体[0]。化学结构得到了很好的表征。所有的配体都具有简单的化学结构，从而进一步使配合物具有优异的热稳定性，易于升华和纯化。证明了这些发光体具有短发射寿命的磷光特性。值得注意的是，所有配合物都表现出显著的深红/近红外发射，这与报道的[−1，−1，−1]带电配体基铱（III）配合物有很大不同。通过在[−1]或[0]带电配体中引入供电子或吸电子基团，这些配合物的光物理性质得到了有规律的改善。所制备的有机发光二极管具有深红色/近红外发射特性，具有良好的外量子效率和低导通电压（<2.6 V）。本研究为构建具有不同价态[−2，−1,0]带电配体的新型磷光铱（III）发射体提供了新的思路，为其光电应用提供了新的机遇和挑战。
A series of [−2, −1, 0] charged‐ligand based iridium(III) complexes of [Ir(bph)(bpy)(acac)] (1), [Ir(bph)(2MeO‐bpy)(acac)] (2), [Ir(bph)(2CF3‐bpy)(acac)] (3), [Ir(bph)(bpy)(2tBu‐acac)] (4) and [Ir(bph)(bpy)(CF3‐acac)] (5), which using biphenyl as dianionic ligand [−2], acetylacetone (or its derivatives) as monoanionic ligand [−1], and 2,2′‐bipyridine (or its derivatives) as neutral ligand [0] were designed and synthesized. The chemical structures were well characterized. All of the ligands have simple chemical structures, thus further making the complexes have excellent thermal stability and are easy to sublimate and purify. Phosphorescent characteristics with short emission lifetime were demonstrated for these emitters. Notably, all of the complexes exhibit remarkable deep red/near infrared emission, which is quite different from the reported [−1, −1, −1] charged‐ligand based iridium(III) complexes. The photophysical properties of these complexes are regularly improved by introducing electron‐donating or ‐withdrawing groups into [−1] or [0] charged‐ligand. The related organic light‐emitting diodes exhibited deep red/near infrared emission with acceptable external quantum efficiency and low turn‐on voltage (<2.6 V). This work provides a new idea for the construction of new type phosphorescent iridium(III) emitters with different valence states of [−2, −1, 0] charged ligands, thus offering new opportunities and challenges for their optoelectronic applications.