Luminescence properties of Eu2+-doped MAl2-xSixO4-xNx (M = Ca, Sr, Ba) conversion phosphor for white LED applications

Y.Q. Li, G. With, de, H.T.J.M. Hintzen

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Abstract

Undoped and Eu-doped MAl2-xSixO4-2Nx (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 MAl2O4 was determined. Nitrogen can be incorporated into MAl2O4 by replacement of (AlO)+ by (SiN)+, whose amount of solubility depends on the M cation. The solubility of (SiN)+ is very low in CaAl2O4 and SrAl2O4 lattices (x = 0.025 and 0.045 respectivily), whereas a large amount of (SiN)+ can be incorporated into BaAl2O4 (x = 0.6). Incorporation of (SiN)+ hardly modifies the luminescence properties of Eu2+ -doped MAl2O4 (M = Ca, Sr) because of limited solubility of (SiN)+, showing the blue and green emission at almost constant wavelentght of 440 and 515 nm, respectively. Eu2+ -doped BaAl2-xSixO4-xNx exhibits a broad green emission band with a maximum in the range of 500 - 526 nm, depending on the concentration of (SiN)+ and Eu2+. In addition, both excitation and emission bands of Eu2+ show a significant red shift as nitrogen is incorporated. BaAl2-xSixO4-xNx:Eu2+ can be efficiently excited in the range of 390-440 nm radiotion, which makes this material attractive as conversion phosphor for white light-emitting diode (LED) lighting applications
Original languageEnglish
Pages (from-to)G278-G282
JournalJournal of the Electrochemical Society
Volume153
Issue number4
DOIs
Publication statusPublished - 2006

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