Light emitting device

The invention provides a light emitting device with improved lighting efficiency. The light emitting device of an embodiment includes a light emitting element emitting near-ultraviolet light or blue light as exciting light; and a yellow color conversion layer including a yellow phosphor and a resin,...

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Bibliographic Details
Main Authors HATTORI,YASUSHI, ALBESSARD,KEIKO, ISHIDA,KUNIO, KATO,MASAHIRO
Format Patent
LanguageEnglish
Published 04.11.2015
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Summary:The invention provides a light emitting device with improved lighting efficiency. The light emitting device of an embodiment includes a light emitting element emitting near-ultraviolet light or blue light as exciting light; and a yellow color conversion layer including a yellow phosphor and a resin, the yellow phosphor represented by formula (1) and being capable of converting the exciting light to yellow light, the resin surrounding the yellow phosphor, the yellow color conversion layer containing the yellow phosphor at a volume concentration of at most 7%, the yellow color conversion layer having a region whose cross section parallel to a light emitting surface of the light emitting element has an area larger than the light emitting surface, (Sr1-x1Cex1)a1AlSib1Oc1Nd1 (1) wherein x1, a1, b1, c1, and d1 satisfy following relations: 0<x1<=0.1, 0.6<a1<0.95, 2.0<b1<3.9, 0<c1<0.45, and 4.0<d1<5.0.
Bibliography:Application Number: CN201510214240