Luminescent properties of calcium-alumino-silicate glasses (CaAlSi) doped with Sm2O3 and co-doped with Sm2O3 + Eu2O3 for LED glass applications

A new glass system of calcium-alumino-silicate doped with Sm2O3 and co-doped with Sm2O3 ± Eu2O3 was fabricated in order to improve the efficiency of the red emission for phosphor glass materials. The optical properties of the glass samples were studied by measurements using UV–vis absorption spectra and excitation energy. The results showed that 403 nm of photon energy is effective to elevate the electron in a ground state to an excited state. This photon energy was used to study the emission spectra and energy transfer. The luminescence intensity O/R ratio of the glass samples showed a stronger red shift colour with an increase in the dopants. Moreover, the quantum yield (QY) of the glass samples was measured, and the results showed that Eu2O3 can increase the QY by acting as activator. These results indicate that the glass samples are a good potential candidate for LED applications.