Enhanced photoluminescence of Sr3SiO5:Ce3+ and tuneable yellow emission of Sr3SiO5:Ce3+,Eu2+ by Al3+ charge compensation for W-LEDs

Abstract

Trivalent ions B³⁺, Al³⁺ and Ga³⁺ have been introduced into Sr₃SiO₅:Ce³⁺ in this study. Among these ions, Al³⁺ and Ga³⁺ act as charge compensators and significantly enhance the maximum emission of Ce³⁺ by about 100% and 90%, respectively. Then, Al³⁺, Eu²⁺ co-doped Sr₃SiO₅:Ce³⁺ phosphors have been researched, which indicate that the emission spectra can be tuned from 530 to 575 nm by changing the concentration of Eu²⁺. The CIE chromaticity coordinates of the phosphors were calculated from (0.342, 0.518) to (0.442, 0.479). This indicates a potential for applications in daylight LEDs or warm-white LEDs.