Dazzling red luminescence dynamics of Eu3+ doped lithium borate glasses for photonic applications

A series of distinct concentrations of Eu3+ doped lithium borate glassy matrices were prepared by melt quenching technique and their structural and luminescence characteristics have been studied. A wide hump exhibited in X-ray diffraction spectrum and smooth surface from SEM analysis affirms the nebulous behavior of the obtained glassy matrices. A strong excitation band noticed at 393 nm (F-7(0)-> L-5(6)) correlated with the excitation wavelength of near-UV LED chip. By exciting with 393 nm, photoluminescence spectra reveals a strong red emission at 612 nm (D-5(0)-> F-7(2)). Luminescence intensity has been embellished remarkably with rising Eu3+ concentration up to 1.0 mol % which can be identified as optimized concentration. At higher concentrations of Eu3+, emission intensity has been decreased due to concentration quenching. The excited level D-5(0) lifetime is computed and it is evaluated to be 2.57 ms from the decay profile of 1.0 mol % Eu3+: LBZ glassy matrix. CIE color coordinates have been calculated from the luminescence spectra, which indicates strong red emission. Based on the luminescence spectral features, 1.0 mol % Eu3+: LBZ glassy matrices could be suggested as favorable candidates for the application of reddish orange emission photonic devices.