Patent ID: 7271423

Claim:
A semiconductor light-emitting device constituted by mounting a semiconductor light-emitting element on a base substance, wherein the semiconductor light-emitting element emits light having an emission wavelength only in a range of 390 to 420 nm, the light having visibility lower than light in a visible range more than 420 nm; and there is included a fluorescent substance that is excited by outgoing light from the semiconductor light-emitting element and emits red light having an emission wavelength with its main emission peak in a wavelength range of 600 to 670 nm, wherein the fluorescent substance is composed of any one or more selected from a fluorescent substance group consisting of: M 2 O 2 S: Eu (M is any one or more elements selected from La, Gd and Y); 0.5MgF 2 .3.5MgO.GeO 2 : Mn; Y 2 O 3 : Eu; Y(P, V) O 4 : Eu; and YVO 4 : Eu.