Spectral broadening of a single Ce3+-doped garnet by chemical unit cosubstitution for near ultraviolet LED

In this paper, the isostructural Mg 3 Al 2 Si 3 O 12 was introduced into the Ce 3+ -doped yttrium aluminum garnet (Y 3 Al 5 O 12 ) for synthesizing (Y 1-x Mg x ) 3 Al 2 (Al 1-x Si x ) 3 O 12 :Ce 3+ (x = 0-0.6)solid solution phosphors.The co-substitution of the (Mg, Si) 6+ pair for the (Y, Al) 6+ pair leads to lattice shrinkage and then changes the spectral shape and width.The band peaking at ~450 nm shows a substantial broadening with the full width at half maximum increasing from 65 nm to 94 nm.The intensity of excitation spectrum (x = 0.5) at 400 nm is increased by 50% than that (x = 0).The near ultraviolet LED was fabricated with Y 1.5 Mg 1.5 Al 3.5 Si 1.5 O 12 :Ce 3+ phosphors and a 400 nm chip and can emit strong white light.Therefore, by controlling the content of (Y, Al) 6+ substituted by (Mg, Si) 6+ , the excitation spectrum of Ce 3+ -doped Y 3 Al 5 O 12 can be tuned and applied for the near ultraviolet LEDs.