Light emitting device

A light emitting device according to embodiments includes: a light emitting diode emitting light with a peak wavelength of 420-445 nm; a first phosphor emitting light with a peak wavelength of 485-530 nm; a second phosphor emitting light with a peak wavelength of 530-580 nm; and a third red phosphor...

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Bibliographic Details
Main Authors NUNOUE, SHINYA, HATTORI, YASUSHI, KATO, MASAHIRO, ISHIDA, KUNIO, FUKUDA, YUMI
Format Patent
LanguageEnglish
Published 29.04.2015
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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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 phosphor emitting light with a peak wavelength of 485-530 nm; a second 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 a color temperature of 4600 K or higher and 5400 K or less. The emission spectrum of the light has a local minimum value of light intensity between a wavelength of 450-470 nm to reduce altered melatonin secretion. The local minimum value is 60% or less of a maximum value of light intensity at a longer wavelength side from the local minimum value.
Bibliography:Application Number: CN201410410761