Abstract: An illumination device has a blue light emitting element that emits blue light and a light guide member that guides blue light emitted from the blue light emitting element to a light exit surface of the light guide member. A first color conversion element includes a red phosphor that emits red light in response to excitation with the blue light. The first color conversion element is disposed on an optical path between the blue light emitting element and the light guide member. A second color conversion element is disposed on a light exit surface side of the light guide member and separated from the first color conversion element. The second color conversion element comprises a pair of non-permeable transparent substrates, a resin disposed between the non-permeable transparent substrates, and a green phosphor dispersed in the resin for emitting green light in response to excitation with the blue light.

Abstract: An illumination device for obtaining white light using two kinds of phosphors for converting blue light into green light and red light based on blue excitation is provided to realize high light emission efficiency and a long life. The illumination device has a structure in which a first color conversion element for converting light into red light based on blue excitation is disposed on an optical path between a second color conversion element for converting light into green light based on blue excitation and a blue light emitting element and separated from the second color conversion element. A resin for sealing a blue LED is mixed with a red phosphor to exit violet light (blue light and red light). A resin containing a green phosphor is disposed on an optical path of violet light. The white light is realized at high light emission efficiency by additive mixing of three colors.