Enhanced Red Luminescence in Dy³⁺/Eu³⁺ Co-doped Calcium Alumino Borosilicate Glasses for w-LED Applications

Dy³⁺ and Eu³⁺ co-doped borosilicate glasses have been synthesised via melt quench technique. Amorphous behaviour of the sample has been verified by XRD study. FT-IR analysis confirmed the presence of various bonds in the host lattice. Energy band gap values of the co-doped glasses were estimated from the UV-VIS data via Tauc Plot. Excitation spectra were recorded under 575 nm (Dy³⁺) and 612 nm (Eu³⁺) emission wavelengths of co-doped glasses. Emission spectra of the co-doped glasses under 350 nm and 393 nm showed a significant shift towards increasing red emission with increasing Eu³⁺ concentrations. Dexter's theory was applied to study the transfer of energy mechanism between Dy³⁺ and Eu³⁺ ions. Time decay curves were plotted for the co-doped glasses for 350 nm excitation and 576 nm emission wavelength. CIE coordinate diagram shows a shift towards red region with increasing excitation wavelength from 350 nm to 465 nm. The enhancement of red component with increasing Eu³⁺ concentrations in the as -prepared borosilicate glasses can be appropriately utilised in various w-LEDs and other optoelectronic devices applications.