I am working in the luminescence characterization of a coordination polymer (CP) in solid state. The CP contains only one type of ligand (organic molecule), which is reponsible for the luminescence emitted by the CP. I have measured the decay curves using multi-channel analyzer and the obtained curve shows a multi-exponential distribution. Two different components were necessary to correctly fit (tail fitting) the whole curve. Therefore, as I do not understand why a molecule could have those two different components, is it correct to give those two lifetimes or should I calculate the mean/average lifetimes?
In the solid state, the ligand can have different aggregation states and so can give a multi-exponential decay. Is the CP soluble? Such aggregation is usually associated with a red shift and/or splitting of the absorption/fluorescence of the solid compared to solution.
Dear Hugh,
Thank you very much for your response. Unfortunately, this compound is completely unsoluble so I cannot study its fluorescence in solution. Could you please give any reference about the effect you commented on?
Regards,
Javi
I don't think we published it, but there are numerous examples in literature, as it is a well known phenomenon.
I Googled "lifetime studies in polymer aggregates"
Article Effect of Aggregation on the Photophysicai Properties of Thr...
Article Conjugated polymer aggregates in solution: Control of interc...
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