LIGHT EMITTING DEVICE
First Claim
1. A light emitting device which is configured having a semiconductor light emitting element and a phosphor layer which has an area A and an area B with different emission spectra, wherein(i) the semiconductor light emitting element emits light of a wavelength of 350 nm or more and 520 nm or less,(ii) the area A includes two or more 1Ath phosphor portions and two or more 2Ath phosphor portions, and the area B includes two or more 1Bth phosphor portions and two or more 2Bth phosphor portions,(iii) the 1Ath phosphor portions and the 2Ath phosphor portions which adjoin one another in the area A are disposed in a direction perpendicular to the thickness direction of the phosphor layer at the interface between the 1Ath and 2Ath phosphor portions, and the 1Ath phosphor portions and the 2Ath phosphor portions which adjoin one another in the area B are disposed in a direction perpendicular to the thickness direction of the phosphor layer at the interface between the 1Ath and 2Ath phosphor portions,(iv) the 1Ath phosphor portions include a 1Ath phosphor which is able to emit light having a longer wavelength light than the light emitted by the semiconductor light emitting element, by being excited by the light emitted by the semiconductor light emitting element,(v) the 2Ath phosphor portions include a 2Ath phosphor which is able to emit light having a longer wavelength light than the light emitted by the first phosphor, by being excited by the light emitted by the semiconductor light emitting element,(vi) the 1Bth phosphor portions include a 1Bth phosphor which is able to emit light having a longer wavelength light than the light emitted by the semiconductor light emitting element, by being excited by the light emitted by the semiconductor light emitting element,(vii) the 2Bth phosphor portions include a 2Bth phosphor which is able to emit light having a longer wavelength light than the light emitted by the semiconductor light emitting element, by being excited by the light emitted by the semiconductor light emitting element, and(viii) a proportion of the light which is irradiated onto area A and area B from the semiconductor light emitting element can be adjusted.
2 Assignments
0 Petitions
Accused Products
Abstract
An object of the present invention is to provide a light emitting device exhibiting a superior emission efficiency which enables easy adjustment of an emission spectrum.
The above object is achieved by a light emitting device comprising a semiconductor light emitting element and a phosphor layer, which has an area A and an area B of different emission spectra, and in which a plurality of phosphor portions are disposed on a plane such that identical phosphor portions do not adjoin one another, and the surface area occupied by specific phosphor portions in the phosphor layer is different in area A and area B.
164 Citations
26 Claims
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1. A light emitting device which is configured having a semiconductor light emitting element and a phosphor layer which has an area A and an area B with different emission spectra, wherein
(i) the semiconductor light emitting element emits light of a wavelength of 350 nm or more and 520 nm or less, (ii) the area A includes two or more 1Ath phosphor portions and two or more 2Ath phosphor portions, and the area B includes two or more 1Bth phosphor portions and two or more 2Bth phosphor portions, (iii) the 1Ath phosphor portions and the 2Ath phosphor portions which adjoin one another in the area A are disposed in a direction perpendicular to the thickness direction of the phosphor layer at the interface between the 1Ath and 2Ath phosphor portions, and the 1Ath phosphor portions and the 2Ath phosphor portions which adjoin one another in the area B are disposed in a direction perpendicular to the thickness direction of the phosphor layer at the interface between the 1Ath and 2Ath phosphor portions, (iv) the 1Ath phosphor portions include a 1Ath phosphor which is able to emit light having a longer wavelength light than the light emitted by the semiconductor light emitting element, by being excited by the light emitted by the semiconductor light emitting element, (v) the 2Ath phosphor portions include a 2Ath phosphor which is able to emit light having a longer wavelength light than the light emitted by the first phosphor, by being excited by the light emitted by the semiconductor light emitting element, (vi) the 1Bth phosphor portions include a 1Bth phosphor which is able to emit light having a longer wavelength light than the light emitted by the semiconductor light emitting element, by being excited by the light emitted by the semiconductor light emitting element, (vii) the 2Bth phosphor portions include a 2Bth phosphor which is able to emit light having a longer wavelength light than the light emitted by the semiconductor light emitting element, by being excited by the light emitted by the semiconductor light emitting element, and (viii) a proportion of the light which is irradiated onto area A and area B from the semiconductor light emitting element can be adjusted.
Specification