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Photoluminescence properties of β-SiAlON:Yb
- Source :
- Science and technology of advanced materials. 12(3)
- Publication Year :
- 2010
-
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 of z and 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.
- Subjects :
- Focus Papers
Subjects
Details
- ISSN :
- 14686996
- Volume :
- 12
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Science and technology of advanced materials
- Accession number :
- edsair.pmid..........5894ca1add591742ec42074f88336597