Efficient green phosphorescent Ir(iii) complexes with β-diketonate ancillary ligands†,Inorganic Chemistry Frontiers

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Efficient green phosphorescent Ir(iii) complexes with β-diketonate ancillary ligands†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-07-30 00:00:00 , DOI: 10.1039/c8qi00489g
Xiaoxiao Liu _{1,

2,

3,

4,

5} , Ying Liu _{4,

6,

7,

8,

9} , Tianzhi Yu _{1,

2,

3,

4} , Wenming Su _{4,

6,

7,

8,

9} , Yuying Niu _{1,

2,

3,

4} , Yanmei Li _{1,

2,

3,

4} , Yuling Zhao _{1,

2,

3,

4} , Hui Zhang _{1,

2,

3,

4}

Affiliation

Three new iridium complexes containing 3-(pyridine-2-yl)coumarin as the cyclometalated ligand (L) and 1-(3,5-bis(trifluoromethyl)phenyl)-3-(4-methoxyphenyl)propane-1,3-dione (¹L), 1-(furan-2-yl)-4,4-dimethylpentane-1,3-dione (²L) and 1-(3,4-dimethoxyphenyl)-4,4-dimethylpentane-1,3-dione (³L) as the ancillary ligands, respectively, were synthesized as emissive materials for organic light-emitting devices. Among them, the crystal structure of the Ir(III) complex based on the ancillary ligand ¹L was characterized by single crystal X-ray diffraction. The photophysical and electrochemical properties and thermal stabilities of the Ir(III) complexes were systematically investigated. The results showed that all the Ir(III) complexes not only exhibit excellent thermal stabilities but also emit strong green emissions. Furthermore, based on these Ir(III) complexes, solution-processed green organic light-emitting devices with a configuration of ITO/PEDOT:PSS/PVK:PBD (7 : 3, wt%):Ir(III) complex (x wt%, 30 nm)/TPBi (50 nm)/Liq (2 nm)/Al (150 nm) have been successfully fabricated, in which the devices fabricated from the Ir(III) complex based on the ancillary ligand ³L exhibited the best electroluminescence performance with a maximum brightness of 9275 cd m⁻² and a maximum luminous efficiency of 19.38 cd A⁻¹ and a maximum external quantum efficiency (EQE) of 5.37%.

中文翻译：

高效的绿色磷光Ir（iii）配合物与β-二酮辅助配体†

包含3-（吡啶-2-基）香豆素作为环金属化配体（L）和1-（3,5-双（三氟甲基）苯基）-3-（4-甲氧基苯基）丙烷-1,3-的三种新铱配合物二酮（¹ L），1-（呋喃-2-基）-4,4-二甲基戊烷-1,3-二酮（² L）和1-（3,4-二甲氧基苯基）-4,4-二甲基戊烷-1，分别合成了3-dione（³ L）作为辅助配体作为有机发光器件的发光材料。其中，铱（的晶体结构III基于所述辅助配体）复合物¹大号的特点是单晶X射线衍射。Ir（）的光物理和电化学性质以及热稳定性III）对复合物进行了系统的研究。结果表明，所有的Ir（III）配合物不仅表现出出色的热稳定性，而且还发出强烈的绿色辐射。此外，基于这些Ir（III）配合物，溶液加工的绿色有机发光器件具有ITO / PEDOT：PSS / PVK：PBD（7：3，wt％）：Ir（III）配合物（x wt ％，30 nm）/ TPBi（50 nm）/ Liq（2 nm）/ Al（150 nm）已成功制备，其中由基于辅助配体³ L的Ir（III）配合物制备的器件表现出最佳电致发光性能，最大亮度为9275 cd m ^-2最大发光效率为19.38 cd A ^-1，最大外部量子效率（EQE）为5.37％。

更新日期：2018-07-30

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