Synthesis and luminescence of β-SrGe(PO4)2:RE (RE=Eu2+,Eu3+,Tb3+) phosphors for UV light-emitting diodes

Electroluminescent spectra of the LED based on SGP:RE (RE=Eu2+, Eu3+, Tb3+) phosphors (the inset shows the corresponding light image), and the CIE chromaticity coordinates of the mixed samples under 380 nm excitation