PHOTOLUMINESCENCE SPECTRA OF SM3+ AND DY3+ DOPED FLUOROBORATE GLASSES

Two new series of fluoroborate glasses have been prepared from the following ternary chemical compositions (Na2O+RF+B2O3) with the Sm3+ and the Dy3+ as the dopant ions. The spectral characteristics of these optical glasses have been examined by measuring their absorption (NIR) and fluorescence (Visible) spectra by changing the RF (NaF,NaF+AlF3 and AlF3) in three different ways in the above ternary composition to verify the effects from the RF content on the spectral characteristics of the dopants under the UV-radiation from a xenon arc lamp, the Sm3+ glasses are found in bright orange colour and the Dy3+ glasses in Greenish-Yellow. The values of the stimulated emission cross-sections (sigma(rho)epsilon) of the fluorescent states of these glasses have been determined by measuring their emission wavelengths (lambda(rho)) and integrated half band-widths (DELTAlambda(rho)) from the Gaussian curves of the fluorescence transitions.