Dear All,
I got data from Time-resolved PL using TCSPC technique.
Now, I want to fit my data by the double-exponential decay function, But I received an error " Fit did not converge - Parameter(s) A1, A2 are not properly initialized. Please check and correct their values."
Could anyone help me with this?
Thanks
Regards
With what progreamme are you trying to fit it?
If it is not an instrumental software which allows you to deconvolute your instrument response funtion, you should cut the data below... I can't really see on the time axis, about 15nsec, or intensity about 0.07 and try to fit it then.
On the log/linear graph, the double exponential should look like two intersecting straight lines.
Amanj Kheradmand - i recommend cutting the first part of the data (until it drops to about 0.06), and then try to fit again
Hugh J Byrne Dear Hugh, I normalized the response firstly. Then, I cut the beginning part which goes up. I used the double-exponential decay function for the fitting.
Finally, I used the formula to calculate decay time (t) by using A1, A2, T1, and T2.
The decay time I got was 1.75 ns and I am not sure is correct or not.
The result is attached.
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