Luminescence Properties of Eu2+-Activated Alkaline-Earth Silicon-Oxynitride MSi2O2-δN2+2/3δ (M = Ca, Sr, Ba): A Promising Class of Novel LED Conversion Phosphors
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Abstract
The luminescence properties of Eu2+-activated alkaline-earth silicon-oxynitrides have been studied. In the BaO−SiO2−Si3N4 system, a new BaSi2O2N2 compound was obtained having the monoclinic structure with lattice parameters a = 14.070(4) Å, b = 7.276(2) Å, c = 13.181(3) Å, β = 107.74(6)°. All MSi2O2-δN2+2/3δ:Eu2+ (M = Ca, Sr, Ba) materials can be efficiently excited in the UV to visible region (370−460 nm), making them attractive as conversion phosphors for LED applications. A blue-green emission at 490−500 is observed for BaSi2O2N2:Eu2+, yellow emission at 560 nm for CaSi2O2-δN2+2/3δ:Eu2+ (δ ≈ 0), and a green-yellow emission peaking from 530 to 570 nm for SrSi2O2-δN2+2/3δ:Eu2+ (δ ≈ 1), the position depending on the exact value of δ. BaSi2O2N2:Eu2+ is the most promising conversion phosphor for white-light LEDs due to its high conversion efficiency for blue light from InGaN-based LEDs related to its very small Stokes shift.
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