Eu2+ and Mn2+ co-doped oxyfluoride glass ceramic for white color conversion of 400 nm UV-LED

Abstract

SiO2-Na2O-Al2O3-LaF3 glasses doped with Eu2+ and Mn2+ were synthesized to fabricate an inorganic color converter for white LED. When Eu2+ was formed within the glass matrix, the obtained glasses showed cyan emission under 400 nm excitation upon heat treatment and the emission peak has been shifted with the crystallization. White emission has been successfully achieved with the introduction of Mn2+ which supplemented red emission. The glass ceramic has been mounted on a 400 nm UV-LED and successfully demonstrated its practical feasibility with color rendering index of 91.3. The effect of heat treatment and energy transfer between Eu2+ and Mn2+ has been discussed.