The semiconductor light emitting device is composed of a combination of a near ultraviolet LED and a phosphor layer including a plurality of phosphors for absorbing near ultraviolet emitted by the near ultraviolet LED and for emitting fluorescence having an emission peak in a visible wavelength region, and the phosphor layer includes four kinds of phosphors, that is, a blue-based phosphor, a green-based phosphor, a red-based phosphor and a yellow-based phosphor. Thus, lowering of luminous flux derived from red-based light with low luminosity is compensated by yellow-based light with comparatively high luminosity, and the resultant white-based light can be well color balanced, and hence, a semiconductor light emitting device emitting white-based light with high luminous flux and a large Ra can be obtained.

Claims

7 · 2 independent · depth 3

7 granted claims

›1.independentA semiconductor light emitting device for emitting white-based light having a luminescent chromaticity point (x, y) in the CIE chromaticity diagram of…+5

›2.↳ 1The semiconductor light emitting device of claim 1,nwherein said silicate phosphor is a silicate phosphor principally including a compound represented…d2

›3.↳ 1multiple · 1, 2The semiconductor light emitting device of claim 1 or 2,nwherein said blue-based phosphor is either of the following blue-based phosphors (1) and (2),…d2

Multiple dependency — claims 1, 2. Shown here under 1; it stands on every one of them.

The semiconductor light emitting device of claim 1 or 2,nwherein said blue-based phosphor is either of the following blue-based phosphors (1) and (2), said green-based phosphor is either of the following green-based phosphors (3) and (4), and said red-based phosphor is the following red-based phosphor (5):(1) a halophosphate phosphor principally including a compound represented by the following chemical formula:(M11-xEux)10(PO4)6Cl2, wherein M1 is at least one alkali earth metal element selected from the group consisting of Ba, Sr, Ca and Mg, and x is a numerical value satisfying 0<x<1;(2) an aluminate phosphor principally including a compound represented by the following chemical formula:(M21-xEux)(M31-y1Mny1)Al10O17, wherein M2 is at least one alkali earth metal element selected from the group consisting of Ba, Sr and Ca, M3 is at least one element selected from the group consisting of Mg and Zn, and x and y1 are numerical values satisfying 0<x<1 and 0â‰¦y1<0.05;(3) an aluminate phosphor principally including a compound represented by the following chemical formula:(M21-xEux)(M31-y2Mny2)Al10O17, wherein M2 is at least one alkali earth metal element selected from the group consisting of Ba, Sr and Ca, M3 is at least one element selected from the group consisting of Mg and Zn, and x and y2 are numerical values satisfying 0<x<1 and 0.05â‰¦y2<1;(4) a silicate phosphor principally including a compound represented by the following chemical formula:(M11-xEux)2SiO4, wherein M1 is at least one alkali earth metal element selected from the group consisting of Ba, Sr, Ca and Mg and x is a numerical value satisfying 0<x<1; and(5) an oxysulfide phosphor principally including a compound represented by the following chemical formula:(Ln1-xEux)2O2S, wherein Ln is at least one rare earth element selected from the group consisting of Sc, Y, La and Gd and x is a numerical value satisfying 0<x<1.

›4.↳ 1multiple · 1, 2The semiconductor light emitting device of claim 1 or 2,nwherein said near ultraviolet light emitting element includes a light emitting layer made of …d2+1

›6.↳ 1multiple · 1, 2A semiconductor light emitting apparatus comprising the semiconductor light emitting device of claim 1 or 2.d2

›7.independentA semiconductor light emitting apparatus for emitting white-based light having a luminescent chromaticity point (x, y) in the CIE chromaticity diagram…

Classifications

12 codes

IPC · International Patent Classification

Section H — Electricity

H01J1/63
H01L31/055

USPC · US Patent Classification

313/486252/301.4R313/512313/501257/98252/301.4S257/E33.061252/301.4H252/301.4P257/89

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Pendency

4.3 y

1,586 days filing → grant

Office actions

non-final + final

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1 RCE

Examiner

Mariceli Santiago

art unit 2879 · TC 2800

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Citations: 14 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20040245532 A1	9 Dec 2004

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