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Proceedings Paper

New phosphors Eu2+ and Ce3+ doped Sr4-x(Si,Al)19+x(N,O)29+x for white LED applications (Conference Presentation)
Author(s): Chunyun Wang; Takashi Takeda; Shiro Funahashi; Rong-Jun Xie; Naoto Hirosaki

Paper Abstract

Light-emitting diodes (LEDs) have been steadily consolidating their share in the lighting and display market. Phosphor-converted (pc) white LED becomes the preferred way to generate white light especially for general lighting, as it is much cheaper and simpler than RGB system. Phosphors are essential to high color quality and luminous efficacy. However, the number of commercially available phosphors is very limited. Therefore, developing new phosphors suitable for various white LED applications is very important. Recently, our group developed the single-particle-diagnosis approach [1-2] to discover new phosphors, with which a tiny luminescent microcrystalline particle down to 5-10 μm can be selected from powder mixtures. In this work, we report a new green emitting Sr-sialon:Eu phosphor discovered by this approach. The crystal structure was solved and refined from single crystal X-ray diffraction data. Sr-sialon:Eu crystallizes in the trigonal space group P3m1 (no. 156) with a = b = 12.1054 Å, c = 4.8805 Å and Z = 1, and consists of a network of corner sharing (Si,Al)(N,O)4 tetrahedra. Upon doping with Eu2+, the emission band can be tuned from 487 nm to 541 nm with fwhm = 96-124 nm. Ce3+ doped Sr-sialon phosphor shows strong blue emission around 435 nm with a fwhm ≈ 90 nm after 355 nm light excitation. The blue luminescence exhibits a small thermal quenching behavior at high temperature. These performances show that the new Eu2+ and Ce3+ doped Sr-sialon phosphors are promising for white LED applications. [1] N. Hirosaki, T. Takeda, S. Funahashi and R.-J. Xie, Chemistry of Materials, 2014, 26, 4280-4288. [2] T. Takeda, N. Hirosaki, S. Funahashi and R.-J. Xie , Materials Discovery, 2015, 1, 29-37.

Paper Details

Date Published: 25 September 2017
Proc. SPIE 10378, Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 103780J (25 September 2017); doi: 10.1117/12.2273642
Show Author Affiliations
Chunyun Wang, Hokkaido Univ. (Japan)
National Institute for Materials Science (Japan)
Takashi Takeda, Hokkaido Univ. (Japan)
National Institute for Materials Science (Japan)
Shiro Funahashi, National Institute for Materials Science (Japan)
Rong-Jun Xie, National Institute for Materials Science (Japan)
Naoto Hirosaki, National Institute for Materials Science (Japan)

Published in SPIE Proceedings Vol. 10378:
Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems
Nikolaus Dietz; Ian T. Ferguson, Editor(s)

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