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首页> 外文期刊>Chemistry: A European journal >Phosphorescent iridium(III) complexes with nonconjugated cyclometalated ligands
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Phosphorescent iridium(III) complexes with nonconjugated cyclometalated ligands

机译：具有非共轭环金属化配体的磷光铱（III）配合物

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摘要

A series of blue phosphorescent iridium(III) complexes 1-4 with nonconjugated N-benzylpyrazole ligands were synthesized and their structural, electrochemical, and photophysical properties were investigated. Complexes 1-4 exhibit phosphorescence with yields of 5-45% in degassed CH2Cl2. Of the compounds, 1 showed emission that was nearly true blue at 460 nm with a lack of vibronic progression. These photophysical data clearly demonstrate that the methylene spacer of the cyclometalated N-benzylpyrazole chelate effectively interrupts the it conjugation upon reacting with a third L boolean AND X chelating chromophore. This gives a feasible synthesis for the blue phosphorescent complexes with a sufficiently large energy gap. In another approach, these complexes were investigated for their suitability for the host material in phosphorescent OLEDs. The device was synthesized by using 1 as the host for the green-emitting [Ir-(ppy)(3)] dopant, which exhibits an external quantum conversion efficiency (EQE) of up to 11.4% photons per electron (and 36.6 cdA(-1)), with 1931 Commission Internationale de L'E-clairage (CIE) coordinates of (0.30, 0.59), a peak power efficiency of 21.7 lmW(-1), and a maximum brightness of 32000 cdm(-2) at 14.5 V At the practical brightness of 100 cdm(-2), the efficiency remains above 11% and 181mW(-1), demonstrating its great potential as the host material for phosphorescent organic light-emitting diodes.
机译：合成了一系列具有非共轭N-苄基吡唑配体的蓝色磷光铱（III）配合物1-4，并研究了它们的结构，电化学和光物理性质。配合物1-4显示出磷光，在脱气的CH 2 Cl 2中产率为5-45％。在这些化合物中，有1个显示在460 nm处几乎是真蓝色的发射，并且没有振动现象。这些光物理数据清楚地表明，环金属化的N-苄基吡唑螯合物的亚甲基间隔基在与第三个L布尔AND X螯合发色团反应后可有效中断其结合。对于具有足够大的能隙的蓝色磷光配合物，这给出了可行的合成方法。在另一种方法中，研究了这些配合物对磷光OLED中主体材料的适用性。该器件是通过使用1作为绿色发射的[Ir-（ppy）（3）]掺杂剂的主体来合成的，该掺杂剂表现出每个电子高达11.4％的光子（和36.6 cdA（ -1）），1931年国际照明委员会（CIE）坐标为（0.30，0.59），峰值功率效率为21.7 lmW（-1），最大亮度为32000 cdm（-2）。 14.5 V在100 cdm（-2）的实际亮度下，效率保持在11％和181mW（-1）以上，表明其作为磷光有机发光二极管主体材料的巨大潜力。

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