Aggregation-Induced Emission in a Flexible Phosphine Oxide and its Zn(II) Complexes—A Simple Approach to Blue Luminescent Materials,Advanced Functional Materials

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Aggregation-Induced Emission in a Flexible Phosphine Oxide and its Zn(II) Complexes—A Simple Approach to Blue Luminescent Materials
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-01-24 , DOI: 10.1002/adfm.202212436
Christin Kirst ₁ , Fabian Knechtel _{1,

2} , Manuel Gensler ₃ , David Fischermeier ₄ , Jens Petersen ₄ , Nader A. Danaf _{1,

2} , Jonathan Tietze ₁ , Armin Wedel ₃ , Don C. Lamb _{1,

2} , Roland Mitrić ₄ , Konstantin Karaghiosoff ₁

Affiliation

Easily accessible blue-emitting materials are in the focus of ongoing research, as they still lack the efficiency and lifetime of their red and green counterparts. The new multidentate phosphine oxide ligands and two respective ZnCl₂ complexes presented here combine a straightforward synthesis with high yields and show interesting luminescent properties. The free ligand exhibits blue luminescence in the crystalline state, but not in amorphous films or diluted solution. In contrast, the Zn(II) complexes shows intense blue luminescence in the crystalline state as well as in amorphous thin films and in solution. Fluorescence lifetime imaging microscopy measurements show luminescence lifetimes of 3–6 ns indicative of fluorescence. By combining the experimental data with quantum chemical calculations, we propose a model where the conformation of the molecule is restricted, either via the crystal environment, aggregation, or the steric fixation by the coordinating central atom, blocking the nonradiative relaxation from the excited into the ground electronic state. However, this nonradiative relaxation is still possible in the gas phase via elongation of a PC bond. These results may provide a general mechanism to explain the luminescence properties in a whole class of organic phosphine oxides.

中文翻译：

柔性氧化膦及其 Zn(II) 配合物中的聚集诱导发光——蓝色发光材料的一种简单方法

易于获得的蓝色发光材料是正在进行的研究的重点，因为它们仍然缺乏红色和绿色材料的效率和寿命。新的多齿氧化膦配体和两个相应的 ZnCl ₂这里介绍的复合物结合了简单的合成和高产率，并显示出有趣的发光特性。自由配体在结晶状态下显示蓝色发光，但在无定形薄膜或稀释溶液中则不显示。相比之下，Zn(II) 配合物在结晶状态以及非晶薄膜和溶液中显示出强烈的蓝色发光。荧光寿命成像显微镜测量显示 3-6 ns 的发光寿命指示荧光。通过将实验数据与量子化学计算相结合，我们提出了一个模型，其中分子的构象受到限制，通过晶体环境、聚集或协调中心原子的空间固定，阻止非辐射弛豫从激发到地面电子状态。然而， C键。这些结果可能提供一种通用机制来解释一整类有机氧化膦的发光特性。

更新日期：2023-01-24

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