| Autor: |
Ahmad Ibrahim, Dennis Hönel, Koichi Kawamura, Christian Ley, Thomas Fäcke, Guenther Walze, Xavier Allonas, Rainer Hagen, Horst Berneth, Marc Stephan Weiser, Thomas Rölle, Friedrich-Karl Bruder |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Chemistry - A European Journal. 20:15102-15107 |
| ISSN: |
0947-6539 |
| Popis: |
Optimization of holography recording in photo- polymers was studied from the point of view of a quite gen- eral 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 investigat- ed 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 Safranine O). 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 photopoly- merization. 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 proper- ty is directly governed by primary events. This shed some light on the efficiency of photochemical pathway to gener- ate radicals for use in organic or polymer areas. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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