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Undoped and Eu-doped MAl 2-x Si x O 4-x N x (M = Ca, Sr, Ba) were synthesized by a solid-state reaction method at 1300-1400°C under nitrogen-hydrogen atmosphere. The solubility of (SiN) + in MAl 2 O 4 was determined. Nitrogen can be incorporated into MAl 2 O 4 by replacement of (AlO) + by (SiN) + , whose amount of solubility depends on the M cation. The solubility of (SiN) + is very low in CaAl 2 O 4 and SrAl 2 O 4 lattices (x ≈ 0.025 and 0.045, respectively), whereas a large amount of (SiN) + can be incorporated into BaAl 2 O 4 (x ≈ 0.6). Incorporation of (SiN) + hardly modifies the luminescence properties of Eu 2+ -doped MAl 2 O 4 (M = Ca, Sr) because of limited solubility of (SiN) + , showing the blue and green emission at almost constant wavelength of 440 and 515 nm, respectively. Eu 2+ -doped BaAl 2-x Si x O 4-x N x exhibits a broad green emission band with a maximum in the range of 500-526 nm, depending on the concentration of (SiN) + and Eu 2+ . In addition, both excitation and emission bands of Eu 2+ show a significant red shift as nitrogen is incorporated. BaAl 2-x Si x O 4-x N x :Eu 2+ can be efficiently excited in the range of 390-440 nm radiation, which makes this material attractive as conversion phosphor for white light-emitting diode (LED) lighting applications.

Luminescence Properties of Eu[sup 2+]-Doped MAl[sub 2−x]Si[sub x]O[sub 4−x]N[sub x] (M=Ca, Sr, Ba) Conversion Phosphor for White LED Applications