| Abstract: | This doctoral dissertation presents systematic results from borate glasses to germanate
glasses singly, doubly and triply doped with Dy³⁺ and Ln³⁺ (Ln = Ce, Pr, Tm, Tb, Eu, Sm) ions
as potential candidates to generate white luminescence. All samples were synthesized using the
traditional melt quenching-technique. To study the spectroscopic properties of these glass
systems, the excitation and luminescence spectra were recorded. The energy transfer processes
between of rare earth ions were also examined. Moreover, the influence of concentration of rare
earth ions, oxide and fluoride modifiers and excitation wavelengths on spectroscopic properties
of glasses was studied. In particular, the correlation between the glass host and the yellow-toblue
luminescence intensity ratio Y/B were examined. Moreover, from the emission spectra the
Commission Internationale de I’Eclairage (CIE) chromaticity coordinates (x, y) and the
correlated color temperatures (CCT) were calculated in relation to the potential application of
prepared glasses for white lighting. The obtained results indicate that these glasses can be used
as potential white light emitters. |