Fig. 5From: Enhancement of luminescence in white emitting strontium fluoride core @ calcium fluoride shell nanoparticles a Excitation spectra of SrF2:3Dy core nanoparticles and its CaF2 shell at different ratios of shells monitor at 575-nm emission wavelength. b Emission spectra of SrF2:3Dy@CaF2 (1:2) monitor at two different excitation wavelengths 240 and 349 nmBack to article page