| 摘要 |
PROBLEM TO BE SOLVED: To make a uniform wavelength conversion and prevent a color unevenness caused by a difference between conversion efficiencies, by a method wherein a wavelength conversion element in which a thickness and a density of a wavelength conversion substance have previously been set to be a desired value is provided. SOLUTION: A wavelength conversion element 4 is provided with a wavelength conversion element layer 4a, in which uniform mixture of a wavelength conversion substance with a resin binder holding the wavelength conversion substance is coated and cured on a sheet-like base body film 4b. And, it is arranged in a reflection horn 2 so that the wavelength conversion element layer 4a is brought into contact with a translucent substrate 3a of a LED chip 3. The wavelength conversion element 4 is not predipped in the reflection horn 2 to cure, but the wavelength conversion substance is formed in a layered manner. Accordingly, it is possible to control a thickness of the wavelength conversion substance layer and enhance uniformity of a wavelength conversion efficiency and an efficiency. |
