Patent ID: 9140836
Filing Date: 2015-09-22
Classification: C09K,G02B,H01L,Y02E

Abstract:
1. A method of shielding ultraviolet light and increasing visible light, the method comprising: a first excitation step of exciting a fluorescent material by external light of 200 nm to 330 nm: an internal light emission step in which the fluorescent material excited in the first excitation step emits internal light of 330 nm to 400 nm; a second excitation step of exciting said or a different fluorescent material by external light of 330 nm to 400 nm and by said internal light of 330 nm to 400 nm; and a visible light emission step in which the fluorescent material excited in the second excitation step emits visible light of 400 nm or more, wherein an emission peak wavelength λ