Enhanced Red Luminescence in Dy/Eu Co-doped Calcium Alumino Borosilicate Glasses for w-LED Applications.

Dy and Eu 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 (Dy) and 612 nm (Eu) 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 Eu concentrations. Dexter's theory was applied to study the transfer of energy mechanism between Dy and Eu 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 Eu concentrations in the as -prepared borosilicate glasses can be appropriately utilised in various w-LEDs and other optoelectronic devices applications.