White light emitting device with adapted melatonin secretion

A light emitting device according to embodiments includes a light emitting diode, emitting light with a peak wavelength of 420 - 445 nm, a first blue phosphor emitting light with a peak wavelength of 485 - 530 nm, a second green phosphor emitting light with a peak wavelength of 530-580 nm, and a thi...

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Bibliographic Details
Main Authors NUNOUE, SHINYA, HATTORI, YASUSHI, KATO, MASAHIRO, ISHIDA, KUNIO, FUKUDA, YUMI
Format Patent
LanguageEnglish
French
German
Published 06.05.2015
Subjects
ADHESIVES
ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
DYES
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
LIME, MAGNESIA
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
REFRACTORIES
SEMICONDUCTOR DEVICES
SLAG
TREATMENT OF NATURAL STONE
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Summary:A light emitting device according to embodiments includes a light emitting diode, emitting light with a peak wavelength of 420 - 445 nm, a first blue phosphor emitting light with a peak wavelength of 485 - 530 nm, a second green phosphor emitting light with a peak wavelength of 530-580 nm, and a third red phosphor emitting light with a peak wavelength of 600 - 650 nm. The device emits light having an emission spectrum that has a local minimum value of light intensity between a wavelength of 450 - 470 nm to reduce altered melatonin secretion. The local minimum value being 60% or less of a maximum value of light intensity at a longer wavelength side from the local minimum value, and the device emits light having a color temperature of 4600 K or higher and 5400 K or less.
Bibliography:Application Number: EP20140180256