Phosphors for White LEDs in the Next Stage

• YAMAMOTO Hajime

  Tokyo University of Technology, School of Bionics

• YASUDA Satoshi

  Tokyo University of Technology, School of Bionics Presently at Stanley Electric Co. Ltd.

• UHEDA Kyota

  Tokyo University of Technology, School of Bionics Presently at Mitsubishi Chemical Corporation, MCC Group Science and Technology Research Center

Abstract

This paper reviews physical pictures of phosphor materials, which can meet requirements of diversified white-LED applications in the next stage. Suppression of thermal quenching and suitable band width of luminescence are the main concern. Basically tight space around an emitting ion and rigid chemical bonding can improve thermal quenching and narrow the band width. There are, however, other factors such as delocalization of an excited state leading to nanradiative processes. Preferable properties are discussed with reference to examples, e.g. La₂O₂S:Eu³⁺, Y₃Al₅O₁₂:Ce³⁺ and CaAlSiN₃:Eu²⁺, which show a difference in quenching temperature and β-SiAlON:Eu²⁺, which has a narrow band width.

Journal

• Journal of Light & Visual Environment

  Journal of Light & Visual Environment 32 (2), 69-74, 2008

  The Illuminating Engineering Institute of Japan

Keywords

• phosphors
• thermal quenching
• luminescence band width

Details

• CRID: 1390282679593858944
• NII Article ID: 110006663887
• NII Article ID: 130004439640
• NII Book ID: AA00258424
• DOI: 10.2150/jlve.32.69
• ISSN: 13498398
• ISSN: 03878805
• Web Site: http://www.jstage.jst.go.jp/article/jlve/32/2/32_2_69/_pdf
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10486400
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • NDL-Digital
  • CiNii Articles
• Abstract License Flag: Disallowed