Photoluminescence properties of β-SiAlON:Yb2+, a novel green-emitting phosphor for white light-emitting diodes
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 v...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2011-01-01
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| Series: | Science and Technology of Advanced Materials |
| Online Access: | http://iopscience.iop.org/1468-6996/12/3/034404 |
| Summary: | 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. |
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| ISSN: | 1468-6996 1878-5514 |