WAVELENGTH-TRANSFORMING MATERIAL, LIGHT-EMITTING DEVICE AND METHOD FOR PRODUCING THE WAVELENGTH-TRA

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PROBLEM TO BE SOLVED : To provide a wavelength-transforming material presenting more efficient fluorescence than that of conventional ones by combining an oxynitride phosphor or a nitride phosphor with a material dispersing the same, a method for producing the wavelength-transforming material and a light emitting device using the same. SOLUTION : In the wavelength-transforming material, oxynitride phosphor particles or nitride phosphor particles are dispersed in glass having ≥700°C softening point. By the aforesaid combination, rare earth elements in the phosphor do not dissolve in the glass even in a process for dispersing the phosphor particles in the glass, the wavelength-transforming efficiency is enhanced and is not deteriorated by excited lights ranging from violet to ultraviolet. The wavelength-transforming material has high light emission efficiency from the phosphor and stable without influenced by environmental atmosphere such as water and the like. The light-emitting device small and having long life is provided by combining the wavelength-transforming material with a nitride semiconductor light-emitting device or the like. COPYRIGHT : (C)2007, JPO&INPIT