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 about  72nm.  if I excite at any wavelength my emission spectra was observed at the same excitation wavelength. I need help on what could be responsible for this phenomenon and how can I correct it 

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