title: Photoluminescence properties of β-SiAlON:Yb2+, a novel green-emitting phosphor for white light-emitting diodes.
abstract: We have synthesized Yb2+-activated Si6-zAlzOzN8-z(0.05⩽z⩽2.3, 0.03 mol% ⩽Yb2+⩽0.7 mol%) green phosphors by solid-state reaction at 1900 °C for 2 h under a nitrogen pressure of 1.0 MPa. Phase purity, photoluminescence and its thermal quenching were investigated. A single phase was obtained for all values ofzand Yb2+concentration. A distinct emission band was observed at 540 nm originating from the 5d-4f electronic transition in Yb2+under 480 nm excitation. The photoluminescence properties mainly depended on the Yb2+concentration and chemical composition of the matrix. The resultant phosphor showed high thermal stability, that is, the emission intensity at 150 °C was about 82% of that measured at room temperature. The experimental results indicate that β-SiAlON:Yb2+is a potential green phosphor for white light-emitting diodes (LEDs), which use blue LEDs as the primary light source.
authors.affiliation: Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China; Nitride Particle Group, Nano Ceramics Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, People's Republic of Japan; Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern Univrsity, Shenyang, Liaoning, 110004, People's Republic of China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Liu
authors.affiliation: Nitride Particle Group, Nano Ceramics Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, People's Republic of Japan.
authors.forename: Rong-Jun
authors.initials: RJ
authors.lastname: Xie
authors.affiliation: Nitride Particle Group, Nano Ceramics Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, People's Republic of Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Hirosaki
authors.affiliation: Nitride Particle Group, Nano Ceramics Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, People's Republic of Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Takeda
authors.affiliation: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern Univrsity, Shenyang, Liaoning, 110004, People's Republic of China.
authors.forename: Chen-Ning
authors.initials: CN
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern Univrsity, Shenyang, Liaoning, 110004, People's Republic of China.
authors.forename: Jiguang
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern Univrsity, Shenyang, Liaoning, 110004, People's Republic of China.
authors.forename: Xudong
authors.initials: X
authors.lastname: Sun
keywords: beta-sialon; green-emitting; oxynitride; phosphor; white LEDs