Bi_(0.5)Na_(0.5)TiO_3:Eu~(3+): An intense blue converting red phosphor

摘要

An efficient red-emitting phosphor, Bi_(0.5)Na_(0.5)TiO_3:Eu~(3+), was synthesized by the solid-state reaction. The Bi_(0.5)Na_(0.5)TiO_3:Eu~(3+) phosphor showed a strong red emission corresponding to the ~5D_0→~7F_2 (618 nm) transition of Eu~(3+) under blue excitation (464 nm). The emission intensity reached its maximum when Eu~(3+)-doped concentration is 0.25 mol. Furthermore, Bi_(0.5)Na_(0.5)TiO_3:0.25Eu~(3+) revealed high quantum yield (η=0.50) and smaller full width at half-maximum (FWHM) values (5 nm). These results show that Bi_(0.5)Na_(0.5)TiO_3:Eu~(3+) material is a promising red phosphor for application in W-LEDs with blue LEDs chip.