Photoluminescence properties of Y_5Si_3O_(12)N:Ce~(3+) blue-emitting phosphors for white LED

摘要

Blue oxonitridosilicate phosphors with compositions of (Y_(1-x)Ce_x)_5Si_3o_(12)N (x = 0-0.1) have been synthesized. The structures, photoluminescence properties and the relations between the structure and luminescence have been investigated and discussed. The atomic positions and the lattice parameters of Y_5Si_3O_(12)N were acquired. Y atoms occupy two crystallographic sites (Y(l) and Y(2)) in the structure. Ce~(3+) ions were substituted for Y~(3+) ions and two types of photoluminescence centers (Ce(l)~(3+) and Ce(2)~(3+)) have been formed. The excitation and emission processes of Ce(l)~(3+)and Ce(2)~(3+) photoluminescence centers were identified and studied. The concentration- and temperature-dependent properties of these Y_5Si_3O_(12)N:Ce~(3+) phosphors were investigated. This study shows these blue Y_5Si_3O_(12)N:Ce~(3+) phosphors the potential applications in the three-RGB phosphor-converted white LEDs.