Luminescent properties of Ca2Mg0.75Al0.5Si1.75O7:Ln (Ln = Ce3+, Dy3+, Eu3+, Sm3+) and their application for UV white light-emitting diodes

A series of Ca2Mg0.75Al0.5Si1.75O7:Ln (Ln = Ce3+, Dy3+, Eu3+, Sm3+) phosphors were synthesized by conventional high temperature solid state reaction. Their luminescent properties, color chromaticity and application in UV white LED were investigated. The research showed that the CIE chromatic coordinates of the phosphors are in the blue (Ce3+ doped sample), white (Dy3+doped sample) and red (Eu3+ and Sm3+ doped sample) regions, respectively. Furthermore, blue, red and white light-emitting diode (LED) prototypes were fabricated using as-prepared phosphors and UV chips. In addition, the luminescence efficiency, CIE chromaticity coordinates, correlated color temperature (CCT) and color rendering index (CRI) of these LED prototypes were exhibited. The results indicated that these phosphors were of potential application in UV white LED.