Fabrication of sodium borosilicate glass and Eu-doped SiAlON composites for white LED

• SEGAWA Hiroyo

  National Institute for Materials Science

• HIROSAKI Naoto

  National Institute for Materials Science

抄録

The oxynitride phosphor Ca-α-SiAlON:Eu²⁺ has a high thermal tolerance. A series of sodium borosilicate glasses [xNa₂O–(60 − x)B₂O₃–40SiO₂, mol %, x = 2–40] was prepared to investigate their ability to host the Ca-α-SiAlON:Eu²⁺ phosphor powder. The glass-SiAlON phosphor composites, which can emit yellow light when irradiated with blue light (wavelength = 450 nm), were successfully fabricated when the re-melting temperature was 1000 or 1100°C. The chromaticity of the composites, which was estimated from photoluminescence spectra, changed from blue to yellow with increasing SiAlON concentration and sample thickness. This indicates that white light could be generated by controlling the SiAlON concentration and sample thickness. In particular, the 3-mm-thick 10Na₂O–50B₂O₃–40SiO₂ glass with a 2 mass % of phosphor generated near-white light. The quantum efficiency of the composites increased with increasing SiAlON concentration and reached a similar value to that of the phosphor powder, and increased as the Na₂O concentration of the glass decreased.

収録刊行物

• Journal of the Ceramic Society of Japan

  Journal of the Ceramic Society of Japan 123 (1437), 452-455, 2015

  公益社団法人 日本セラミックス協会

キーワード

• Glass composite
• Phosphors
• Photoluminescence
• Light-emitting diodes
• Glass structures
• Quantum efficiency

詳細情報

• CRID: 1390282680265095808
• NII論文ID: 130005068658
• DOI: 10.2109/jcersj2.123.452
• ISSN: 13486535
• ISSN: 18820743
• Web Site: https://www.jstage.jst.go.jp/article/jcersj2/123/1437/123_JCSJ-N15001/_pdf
• 本文言語コード: ja
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