US6084250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
White light emitting diode
Assignee: US Philips Corp
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Filing: 1998-11-03
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Granted: 2000-07-04
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Expires: 2018-11-03
Abstract
Abstract A light-emitting device comprising a UV-diode with a primary emission of 300 nm</= lambda </=370 nm and a phosphor layer including a combination of a blue-emitting phosphor having an emission band, with 430 nm</= lambda </=490 nm, a green-emitting phosphor having an emission band, with 520 nm</= lambda </=570 nm and a red-emitting phosphor having an emission band, with 590 nm</= lambda </=630 nm, emits high-quality white light. The color-rendering index CRI is approximately 90 at a color temperature of 4000 K. The color rendition depends only on the composition of the three phosphors, not on the relation between converted and non-converted light, and hence can be readily controlled and regulated.
Inventors
- 👤 Thomas Justel
- 👤 Hans Nikol
- 👤 Cees Ronda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:57
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/851; H10H20/8511; H10H20/8512; H10H20/8513
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A light-emitting device comprising an UV-diode with a primary emission of 300 nm≦λ≦370 nm and exposed to said emission a phosphor layer comprising a blue-emitting phosphor having an emission band, with 430 nm≦λ≦490 nm, a green-emitting phosphor having an emission band, with 520 nm≦λ≦570 nm, and a red-emitting phosphor having an emission band, with 590 nm≦λ≦630 nm.
Claim 2
Dependent Claim
57 words
A light-emitting device comprising an UV-diode with a primary emission of 300 nm≦λ≦370 nm and exposed to said emission a phosphor layer comprising a blue-emitting phosphor having an emission band, with 430 nm≦λ≦490 nm, a green-emitting phosphor having an emission band, with 520 nm≦λ≦570 nm, and a red-emitting phosphor having an emission band, with 590 nm≦λ≦630 nm.
Claim 3
Dependent Claim
29 words
A light-emitting device as claimed in claim 1, characterized in that the red-emitting phosphor is a emitter having an emission band with a wavelength maximum of 605 nm≦λ≦620 nm.
Claim 4
Dependent Claim
29 words
A light-emitting device as claimed in claim 1, characterized in that the green-emitting phosphor is a emitter having an emission band with a wavelength maximum of 520 nm≦λ≦570 nm.
Claim 5
Dependent Claim
17 words
A light-emitting device as claimed in claim 1, characterized in that the UV-diode is a GaN diode.
Claim 6
Dependent Claim
49 words
A light-emitting device as claimed in claim 1, characterized in that the phosphor layer comprises a blue-emitting phosphor in a quantity x1 of 0<x1<30% by weight, a green-emitting phosphor in a quantity x2 of 20≦x2≦50% by weight and a red-emitting phosphor in a quantity x3 of 30≦x3≦70% by weight.
Claim 7
Dependent Claim
39 words
A light-emitting device as claimed in claim 1, characterized in that the phosphor layer comprises BaMgAl 10 O 17 :Eu as the blue-emitting phosphor, ZnS:Cu as the green-emitting phosphor and Y 2 O 2 S as the red-emitting phosphor.
Claim 8
Dependent Claim
51 words
A light-emitting device as claimed in claim 1, characterized in that the phosphor layer comprises a phosphor of the general formula [Eu(diketonate) a X b1 X' b2 ] as the red-emitting phosphor, wherein X=pyridine or a monodentate pyridine derivative and X'=2,2'-bipyridine or a 2,2'-bipyridyl derivative and 2a+b 1 +2b 2 =8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-07-04 | 2004-01-03 | 2004-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-07-04 | 2008-01-03 | 2008-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-07-04 | 2012-01-03 | 2012-07-04 | $7700.00 | Window Closed / Lapsed |