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首页> 外文期刊>Chemistry: A European journal >High Performance Photoinitiating Systems for Holography Recording: Need for a Full Control of Primary Processes
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High Performance Photoinitiating Systems for Holography Recording: Need for a Full Control of Primary Processes

机译：全息照相记录的高性能光引发系统：需要对主要过程的完全控制

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Optimization of holography recording in photopolymers was studied from the point of view of a quite general process, that is, the photogeneration of radicals. On the basis of a dye/coinitiator photoinitiating system, the effect of primary events and their relative efficiency was investigated with respect to the final overall properties, such as the diffraction efficiency. Quenching of the dye excited states by the borate salts coinitiators exhibits important differences depending on the dye used (Rose Bengal or SafranineO). Keeping in mind that both singlet and triplet states of the dyes can react, and taking into account the viscosity of the matrix, a method to evaluate the overall quantum yield of radicals released is proposed. It is found that this quantum yield well correlates with the maximum rate of photopolymerization. More interestingly, the dose required to obtain a given diffraction efficiency was found to be also governed by the radical quantum yield, showing that the final property is directly governed by primary events. This shed some light on the efficiency of photochemical pathway to generate radicals for use in organic or polymer areas.
机译：从相当普遍的过程，即自由基的光生化的角度，研究了光聚合物中全息记录的优化。在染料/共引发剂光引发体系的基础上，针对最终整体性能（例如衍射效率），研究了主要事件的影响及其相对效率。硼酸盐共引发剂对染料激发态的淬灭表现出重要差异，具体取决于所使用的染料（玫瑰红或番红O）。考虑到染料的单重态和三重态都可以反应，并且考虑到基质的粘度，提出了一种评估释放的自由基的整体量子产率的方法。发现该量子产率与光聚合的最大速率良好相关。更有趣的是，发现获得给定衍射效率所需的剂量也受自由基量子产率的支配，这表明最终性质直接受初级事件支配。这为光化学途径产生自由基用于有机或聚合物领域的效率提供了一些启示。

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