Light emitting device with blue light led and phosphor components
AssigneeNichia Kagaku Kogyo K.K.
InventorsYoshinori Shimizu, Kensho Sakano, Yasunobu Noguchi, Toshio Moriguchi, Eiji Nakanishi
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Abstract
A light source having a planar main surface capable of emitting a white light includes a blue LED, an optical guide plate having a planar main surface and an edge face receiving injection of the light from the blue LED, and a coating material of transparent resin or glass containing fluorescent materials positioned between the blue LED and the optical guide plate. The fluorescent materials can be exited by absorption of a part of the blue light from the blue LED to emit fluorescent light and the fluorescent light can be mixed with a remaining part of the blue light to make white light in the optical guide plate.
Claims15
A light source having a planar main surface capable of emitting a white light which comprises a blue LED, an optical guide plate having a planar main surface and an edge face getting injection of the light from said blue LED, and an coating material of transparent resin or glass containing fluorescent materials positioned between said blue LED and said optical guide plate, whereby the fluorescent materials can be excited by absorption of a part of the blue light from the blue LED to emit fluorescence light and the fluorescence light can be mixed with a remaining part of the blue light to make a white light in said optical guide plate.
Dependencies are inferred from the claim text.