Eu2+/Ce3+emission structural unit revolution and Eu2+/Ce3+energy transfer in Ca2Mg0.75Al0.5Si1.75O7 melilite based on high alumina blast furnace slags

Through Eu2+/Ce3+ doped molten high-alumina blast furnace slag, quenched by icy water, and heat treatment, it was prepared for Ca2Mg0.75Al0.5Si1.75O7: Eu2+/Ce3+ melilite phosphors with emission from blue to green. TheEu2+/Ce3+ emission structural unit revolution processes and Eu2+-Ce3+ energy transfer pathways were sys-tematically studied by DSC thermal analysis, XRD spectra analyses, reflection spectra, excitation and emission spectra, CIE chromaticity, and thermal quenching tests. The layered structure Ca2Mg0.75Al0.5Si1.75O7: 0.4Eu2+,0.4Ce3+ phosphor emits green light with a peak around 532 nm when excited at 385 nm wavelength, and possess good luminescence thermal stability at 150 degrees C. The quenching concentration and critical distance of Eu2+ are 0.4 mol% and 7.09 angstrom, respectively. The main energy transfer mechanism from Ce3+ to Eu2+ ions is the electric dipole-electric quadrupole interaction. It provides a new ideal method of the high value-added function materialization utilization of high alumina blast furnace slag for LED illumination and display in the future.

Automated summary

Ca2Mg0.75Al0.5Si1.75O7: Eu2+/Ce3+ melilite phosphors with emission from blue to green were prepared through Eu2+/Ce3+ doped molten high-alumina blast furnace slag, quenched by icy water, and heat treatment. The Eu2+/Ce3+ emission structural unit revolution processes and Eu2+-Ce3+ energy transfer pathways were systematically studied. The Ca2Mg0.75Al0.5Si1.75O7: 0.4Eu2+,0.4Ce3+ phosphor emits green light under excitation at 385 nm wavelength and possesses good luminescence thermal stability at 150 degrees C.