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首页> 外文期刊>Molecular Crystals and Liquid Crystals >Theoretical Studies of Mono-Cyclometalated Ir(III) Complexes with Phenylpyrazole Based Ligands and Phosphines
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Theoretical Studies of Mono-Cyclometalated Ir(III) Complexes with Phenylpyrazole Based Ligands and Phosphines

机译:苯基吡唑基配体和膦的单环金属化Ir(III)配合物的理论研究

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摘要

New blue emitting mixed ligand iridium(III) complexes comprising one cyclometalating, two phosphines trans to each other such as Ir(dppzc)(PPhMe2)2(H)(L) (L = Cl, CN) [dppzc = 1,3-Diphenyl-1H-pyrazole-4-carboxaldehyde] were studied to tune the phosphorescence wavelength to the deep blue region and to enhance the luminescence efficiencies. We investigate the electron-withdrawing capabilities of ancillary ligands using the DFT and TD-DFT calculations on the ground and excited states of the complexes. From these results, we discussed how the ancillary ligand influences the emission peak as well as the metal to ligand charge transfer (MLCT) transition efficiency. The calculated energies of triplets are 3.09 and 3.16 eV, respectively, which are all higher than that of Ir(dfppy)2(acac) and FIrpic known as blue phosphorescence materials with 2.69 and 2.73 eV.
机译:新型蓝色发射混合配体铱(III)配合物,包括一个环金属化,两个膦彼此间反型,例如Ir(dppzc)(PPhMe 2 2 (H)(L )(L = Cl,CN)[dppzc = 1,3-二苯基-1H-吡唑-4-羧醛]被研究以将磷光波长调节到深蓝色区域并提高发光效率。我们研究了在配合物的基态和激发态上使用DFT和TD-DFT计算得出的辅助配体的吸电子能力。从这些结果,我们讨论了辅助配体如何影响发射峰以及金属到配体的电荷转移(MLCT)转换效率。三重态的计算能量分别为3.09和3.16 eV,均高于Ir(dfppy) 2 (acac)和被称为蓝色磷光材料的FIrpic的能量,其能量分别为2.69和2.73 eV。

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