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Updated: Aug 21, 2026

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
Published on: November 15, 2016
Warm-white light-emitting diode with yellowish orange SiALON ceramic phosphor
Ken Sakuma1, Koji Omichi, Naoki Kimura
1Optics and Electronics Laboratory, Fujikura Ltd, Mutsuzaki 1440, Sakura, Chiba 285-8550, Japan. ksakuma@fujikura.co.jp
Abstract:
A warm-white light-emitting diode (LED) without blending of different kinds of phosphors is demonstrated. An approach that consists of a blue LED chip and a wavelength-conversion phosphor is carried out. The phosphor is a newly developed yellowish orange CaEuSiAlON ceramic phosphor with high efficiency. The CIE1931 chromaticity coordinates (x, y) are (0.458, 0.414), the color temperature is 2750 K, and the luminous efficacy of this LED is 25.9 lm/W at room temperature and with a forward-bias current of 20 mA. The chromaticity of the assembled LED is more thermally stable than that of a LED with a conventional oxide phosphor (YAG:Ce) because of the better thermal stability of the oxynitride phosphor.
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