Carbazole structures are of high interest in photopolymerization due to their enhanced light absorption properties in the near-UV or even visible ranges. Therefore, type I photoinitiators combining the carbazole chromophore to the well-established phosphine-oxides were proposed and studied in this article. The aim of this article was to propose type I photoinitiators that can be more reactive than benchmark phosphine oxides, which are among the more reactive type I photoinitiators for a UV or near-UV light emitting diodes (LED) irradiation. Two molecules were synthesized and their UV-visible light absorption properties as well as the quantum yields of photolysis and photopolymerization performances were measured. Remarkably, the associated absorption was enhanced in the 350–410 nm range compared to benchmark phosphine oxides, and one compound was found to be more reactive in photopolymerization than the commercial photoinitiator TPO-L for an irradiation at 395 nm.

中文翻译：

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新型氧化膦作为自由基聚合的高性能近紫外 I 型光引发剂

由于咔唑结构在近紫外甚至可见光范围内具有增强的光吸收特性，因此它们在光聚合中受到高度关注。因此，本文提出并研究了将咔唑发色团与公认的氧化膦结合的 I 型光引发剂。本文的目的是提出比基准氧化膦更具反应性的 I 型光引发剂，后者是用于紫外或近紫外发光二极管 (LED) 照射的反应性更强的 I 型光引发剂之一。合成了两个分子，并测量了它们的紫外-可见光吸收特性以及光解和光聚合性能的量子产率。值得注意的是，与基准氧化膦相比，350-410 nm 范围内的相关吸收增强，