Instituto de Ciencia Molecular, Universidad de Valencia, C/Catedrático J. Beltrán 2, 46980 Paterna, Spain.
Chemistry. 2013 Jun 24;19(26):8597-609. doi: 10.1002/chem.201300457. Epub 2013 May 6.
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)-1H-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.
描述了一种获得绿色发光铱（III）配合物的新方法。该合成方法包括在 4-苯基吡唑环金属化配体中引入甲基磺酰基吸电子取代基，以稳定最高占据分子轨道（HOMO）。已经合成了六个新的配合物，其中包含 1-（4-（甲基磺酰基）苯基）-1H-吡唑的共轭碱作为环金属化配体。这些配合物在稀释和浓缩薄膜中均显示出绿色发射和非常高的光致发光量子产率。当用作发光电化学电池（LEC）中的主要活性组件时，观察到绿色电致发光。在低驱动电压下可获得高效率和高亮度。这种绿色发光体的方法是对环金属化配体中广泛使用的基于氟的取代基的替代方法，并为 LEC 的绿色发光体的合成开辟了新的设计可能性。
