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首页> 外文期刊>Chemistry: A European journal >Homoleptic tris(Pyridyl Pyrazolate) Ir~(III) Complexes: En route to highly efficient phosphorescent OLEDs
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Homoleptic tris(Pyridyl Pyrazolate) Ir~(III) Complexes: En route to highly efficient phosphorescent OLEDs

机译：均三（吡唑基吡啶鎓）Ir〜（III）配合物：通往高效磷光OLED的途径

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摘要

Treatment of the metal re-agent IrCL_3-HH_2O with two equivalents of 2-pyridyl pyrazole (N?N)H (3-tert-butyl-5-(2-pyridyl) pyrazole, (bppz)H and 3-trifluoromethyl-5-(2-pyndyl) pyr-azole, (fppz)H), afforded the isomeric Ir~(III) metal complexes with a general formula cis-[Ir(OpPz)_2Cl_2]H (2a), trans-[Ir(bppz) _2Cl_2]H (3a), cis-[Ir(fppz)_2-Cl_2]H (2b), and trans-[Ir(fppz)_2Cl_2]H (3b). Single-crystal X-ray diffraction studies on 2 b and 3 a revealed the co-existence of two pyrazolate chelates and two terminal chloride ligands on the coordination sphere. Subsequent reactivity studies confirmed their inter-mediacy to the preparation of homo-leptic mer-[Ir(bppz)_2] (1a) and mer-[Ir-(fppz)_3] (1b) that showed dual intrali-gand and ligand-to-ligand charge-trans-fer phosphorescence at room tempera-ture. To attain bright, room-temperature phosphorescence further, we then synthesized two isoquinolinyl pyrazolate complexes, mer-[Ir(bipz)_3] (4a) and mer-[Ir(fipz)_3] (4b) ((bipz)H = 3-tert-butyl-5-(1-isoquinolyl) pyrazole and (fipz)H = 3-trifluorometh-yl-5-(1-isoquinolyl) pyrazole). Their or-ange luminescence is mainly attributed to the mixed MLCT/ππ transition, and the quantum yields were as high as 86 (4a) and 50% (4b) in degassed CH_2Cl_2 solution at RT. The organic light-emitting diodes (OLEDs) were then fabricated by using 4a as a dopant, giving orange luminescence with CIE_(x,y) = 0.55, 0.45 (CIE_(x,y) = the 1931 Commission Internationale de L'Eclairage (x,y) coordinates) and peak efficiencies of 14.6% photon/elec-tron, 34.8 cdA~(-1), 26.11mW~(-1). The device data were then compared with the previously reported heteroleptic complex [Ir(dfpz)_2(bipz)] (5) ((dfpz)H = l-(2, 4-difluorophenyl) pyra-zole), revealing the possible effect of the bipz chelate and phosphor design on the overall electrophosphorescent performance, which can be understood by the differences in the carrier-trans-port properties.
机译：用两当量的2-吡啶基吡唑（N？N）H（3-叔丁基-5-（2-吡啶基）吡唑，（bppz）H和3-三氟甲基-5）处理金属试剂IrCL_3-HH_2O -（2-吡啶基）吡唑，（fppz）H），得到具有通式cis- [Ir（OpPz）_2Cl_2] H（2a），反式-[Ir（bppz）的Ir〜（III）金属异构体）_2Cl_2] H（3a），顺式[Ir（fppz）_2-Cl_2] H（2b）和反式[Ir（fppz）_2Cl_2] H（3b）。在2b和3a上进行的单晶X射线衍射研究表明，配位球上同时存在两个吡唑酸酯螯合物和两个末端氯化物配体。随后的反应性研究证实了它们对制备均配体的mer- [Ir（bppz）_2]（1a）和mer- [Ir-（fppz）_3]（1b）的介导作用，显示了双重内配体和配体-在室温下配位电荷转移荧光。为了进一步获得明亮的室温磷光，我们然后合成了两种异喹啉基吡唑酸酯配合物，mer- [Ir（bipz）_3]（4a）和mer- [Ir（fipz）_3]（4b）（（bipz）H = 3 -叔丁基-5-（1-异喹啉基）吡唑和（fipz）H = 3-三氟甲基--5-（1-异喹啉基）吡唑）。它们的橙色发光主要归因于MLCT /ππ混合跃迁，在室温下在脱气的CH_2Cl_2溶液中，量子产率高达86（4a）和50％（4b）。然后通过使用4a作为掺杂剂来制造有机发光二极管（OLED），使橙色发光的CIE_（x，y）= 0.55，0.45（CIE_（x，y）= 1931年国际照明委员会（ x，y）坐标）和14.6％光子/电子加速器的峰值效率，34.8 cdA〜（-1），26.11mW〜（-1）。然后将设备数据与先前报道的杂配物[Ir（dfpz）_2（bipz）]（5）（（dfpz）H = 1-（2，4-二氟苯基）吡唑）进行比较，揭示了bipz螯合物和磷光体的设计基于整体电致磷光性能，这可以通过载流子传输特性的差异来理解。

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