Synthesis and photoluminescence of a novel Sr-SiAlON:Eu2+ blue-green phosphor (Sr14Si68-sAl6+sOsN106-s:Eu2+ (s ≈ 7))

Abstract A novel Eu 2+ activated Sr-SiAlON oxynitride phosphor, with the chemical composition of Sr 14 Si 68− s Al 6+ s O s N 106− s :Eu 2+ ( s  ≈ 7), was synthesized by firing the powder mixture of SrO, SrSi 2 , α-Si 3 N 4 , AlN and Eu 2 O 3 at 1900 °C for 6 h under 1 MPa nitrogen atmosphere. The structure has a typical feature of SiAlON consisting of the host framework which is constructed by a three-dimensional MX 4 tetrahedral (M: Si or Al; X: O or N) network, and Sr or Eu 2+ ions as the guest ions. It has been shown that the Sr-SiAlON:Eu 2+ phosphor has the excitation band covering the range of the ultraviolet light region to 500 nm, and exhibits an intense blue-green color with the emission band centered at about 508 nm. The temperature dependent emission intensity of the Sr-SiAlON:Eu 2+ phosphor is better than that of a typical blue-green Ba 2 SiO 4 :Eu 2+ phosphor. It is demonstrated that Sr-SiAlON:Eu 2+ phosphor is very promising for use in white -LEDs.