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25 3.4, Excitation Spectra and Phonon Sideband Analysis The excitation spectra of curopium doped calcium oxalate nano crystals with different doping concentration of Eu*' ions has been recorded and shown in the Fig. 3.2. Excitation spectra has been recorded by monitoring the characteristic emission band originating via the transition ‘Dy—’F2 , which peaks at 615 nm. The dominant band from the excitation spectrum has been observed at 395nm. It is evident from the figure that upon increasing the doping concentration of Eu’ ions in calcium oxalate nano crystals, the intensity of excitation bands also increases. Intensity(arb.unit) 300 400 500 Wavelength(nm) Fig.3.2 Photoluminescence excitation spectra of Ca;.,Eu,C,0,.H20 nano crystal at Aemis =615nm All excitations bands were assigned as 298 nm (Fo >°F4) 318 nm("Fo >°H,), 363 nm(Fo >°D,), 375 am(’Fo >°Gi ) ,395 nm(Fo Ls ) 416 nm("Fo eee Scanned by CamScanner 
