Understanding the Spectroscopic Properties and Aggregation Process of a New Emitting Boron Dipyrromethene (BODIPY)

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• 作者：Thanh Truc Vu ; Marina Dvorko ; Elena Y. Schmidt ; Jean-Fr茅d茅ric Audibert ; Pascal Retailleau ; Boris A. Trofimov ; Robert B. Pansu ; Gilles Clavier ; Rachel M茅allet-Renault
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：March 14, 2013
• 年：2013
• 卷：117
• 期：10
• 页码：5373-5385
• 全文大小：541K
• 年卷期：v.117,no.10(March 14, 2013)
• ISSN：1932-7455

文摘

Aggregation of organic dyes often has consequences on their spectroscopic properties in materials. Here, we study a new sterically hindered boron-dipyrromethene (BODIPY), with adamantyl moieties grafted for the first time on the BODIPY core. Its aggregation behavior was investigated in poly(methyl methacrylate) (PMMA) and on drop-casted films by monitoring absorption, fluorescence emission, relative quantum yield (桅_Fluo,Rel), lifetime and time-resolved anisotropy. Aggregates only appear from 0.067 mol路L^鈥?. A multicomponent analysis demonstrated that the aggregation process can be described by three distinguishable components which correspond to a monomer species (M) and J and H aggregates. The results also indicated a concentration frontier: when the dye concentration increased up to 0.29 mol路L^鈥?, the concentration of M decreased in favor of the aggregates. 桅_Fluo,Rel is yet only divided by 5 compared to the dye in solution. Above 0.29 mol路L^鈥?, an equilibrium between M and the J aggregates is established, showing meanwhile a steady 桅_Fluo,Rel. The J aggregates are found to be dimers, whereas the aggregation number is varying for the H aggregates. Analysis of fluorescence and anisotropy decays showed that the excitation energy was transferred from M to the J dimers, and very probably trapped by H aggregates.