What could make the emission spectra of rhodamin B doped silica nanoparticle different from that of the Rhodamine dye?

In an attempt to encapsulate Rhodamine B in a silica nanoparticle, I observed an unusual emission spectra with multiple peaks within 450 and 700nm. The excitation spectra also show a red shift of...

19 July 2016 8,595 3 View