A fluorescent dye has emission peak at 575 in aquous solution but is shifted to 615 upon drying. what could be possible reasons?
Are you talking of emission spectra of dried solid sample? In a concentrated phase aggregation could take place which could be responsible for red shift (J-aggregates).
https://www.researchgate.net/post/What_are_the_characteristics_of_J-aggregate_in_fluorescence
More than that in concentrated phase inner filter effect (reabsoprtion of emitted light) could take place which would result in "red shift" in peak. Please read Lakowicz's book on secondary inner filter effect (Principles of Fluorescence Spectroscopy). In a recent paper we have also shown how in solid phase secondary inner filter effect may result in "red shift" and how to minimize it.
http://www.currentscience.ac.in/php/forthcoming/27086.pdf
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