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首页> 外文期刊>Chemistry: A European journal >Efficient green-light-emitting electrochemical cells based on ionic iridium complexes with sulfone-containing cyclometalating ligands
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Efficient green-light-emitting electrochemical cells based on ionic iridium complexes with sulfone-containing cyclometalating ligands

机译：基于离子铱配合物与含砜的环金属配体的高效绿色发光电化学电池

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摘要

A new approach to obtain green-emitting iridium(III) complexes is described. The synthetic approach consists of introducing a methylsulfone electron-withdrawing substituent into a 4-phenylpyrazole cyclometalating ligand in order to stabilize the highest-occupied molecular orbital (HOMO). Six new complexes have been synthesized incorporating the conjugate base of 1-(4-(methylsulfonyl)phenyl)-1 H-pyrazole as the cyclometalating ligand. The complexes show green emission and very high photoluminescence quantum yields in both diluted and concentrated films. When used as the main active component in light-emitting electrochemical cells (LECs), green electroluminance is observed. High efficiencies and luminances are obtained at low driving voltages. This approach for green emitters is an alternative to the widely used fluorine-based substituents in the cyclometalating ligands and opens new design possibilities for the synthesis of green emitters for LECs. Green enlightenment: Electron-withdrawing sulfone groups introduced into the cyclometalating phenylpyrazole ligands lead to very efficient green-emitting ionic iridium complexes. Green electroluminescence from efficient light-emitting chemical cells is obtained (see figure).
机译：描述了一种获得绿色发射铱（III）配合物的新方法。合成方法包括将甲基砜吸电子取代基引入到4-苯基吡唑环金属化配体中，以稳定最高占据的分子轨道（HOMO）。已经合成了六种新的配合物，其中结合了1-（4-（甲基磺酰基）苯基）-1 H-吡唑的共轭碱作为环金属化配体。所述复合物在稀释和浓缩膜中均显示绿色发射和很高的光致发光量子产率。当用作发光电化学电池（LEC）中的主要活性成分时，观察到绿色电致发光。在低驱动电压下可获得高效率和亮度。这种绿色发射体的方法可替代环金属化配体中广泛使用的氟基取代基，并为合成LEC的绿色发射体提供了新的设计可能性。绿色启发：引入环金属化苯基吡唑配体的吸电子砜基团可产生非常有效的绿色发射离子铱络合物。从高效的发光化学电池获得绿色电致发光（见图）。

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