US5813752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
UV/blue LED-phosphor device with short wave pass, long wave pass band pass and peroit filters
Assignee: Philips North America LLC
•
Filing: 1997-05-27
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Granted: 1998-09-29
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Expires: 2017-05-27
Abstract
Abstract A visible light emitting device for use in lighting and/or display applications includes a UV LED, a phosphor layer on the upper, main light emitting surface of the LED, and a short wave pass (SWP) filter between the LED and the phosphor layer to transmit UV light from the LED to the phosphor layer, as well as to reflect visible light from the phosphor layer in a forward direction, thus enhancing the efficiency of the device. Additional optical filters located on the top of the phosphor layer further enhance efficiency and/or spectral characteristics of the emitted light.
Inventors
- 👤 Barry Singer
- 👤 Cornelis R. Ronda
- 👤 Leendert Vriens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/851; H04; H04N; H04N9/00; H04N9/12; H04N9/30; H10H20/84; H10H20/841; Y; Y10; Y10S; Y10S362/00; Y10S362/80
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
50 words
A visible light emitting device comprising: a UV and blue light emitting diode; a layer of a first short wave pass (SWP) filter on the upper surface of the LED; and a layer of a UV and blue excitable, visible light emitting phosphor on upper surface of the SWP filter.
Claim 2
Dependent Claim
50 words
A visible light emitting device comprising: a UV and blue light emitting diode; a layer of a first short wave pass (SWP) filter on the upper surface of the LED; and a layer of a UV and blue excitable, visible light emitting phosphor on upper surface of the SWP filter.
Claim 3
Dependent Claim
30 words
The visible light emitting device of claim 1 in which a layer of a second short wave pass (SWP) filter is located on the upper surface of the phosphor layer.
Claim 4
Dependent Claim
29 words
The visible light emitting device of claim 1 in which a layer of a long wave pass (LWP) filter is located on the upper surface of the phosphor layer.
Claim 5
Dependent Claim
25 words
The visible light emitting device of claim 2 in which a band pass (BP) filter is located on the upper surface of the phosphor layer.
Claim 6
Dependent Claim
24 words
The visible light emitting device of claim 1, in which the SWP filter is a multilayer structure of alternately high and low index materials.
Claim 7
Dependent Claim
24 words
The visible light emitting device of claim 2, in which the SWP filter is a multilayer structure of alternately high and low index materials.
Claim 8
Dependent Claim
24 words
The visible light emitting device of claim 3, in which the LWP filter is a multilayer structure of alternately high and low index materials.
Claim 9
Dependent Claim
24 words
The visible light emitting device of claim 4, in which the BP filter is a multilayer structure of alternately high and low index materials.
Claim 10
Dependent Claim
18 words
The visible light emitting device of claim 1 in which the device is enclosed in a transparent cover.
Claim 11
Dependent Claim
18 words
The visible light emitting device of claim 1 in which the upper surface of the material is dome-shaped.
Claim 12
Dependent Claim
25 words
The visible light emitting device of claim 1 in which the LED is elongated in one direction perpendicular to the top surface of the LED.
Claim 13
Dependent Claim
23 words
The visible light emitting device of claim 1 in which an angular redistribution mirror is located on the bottom surface of the LED.
References Cited (Backward Citations)
US4822144A
Cited
US4882617A
Cited
JPH05152609A
Cited
EP0581232A1
Cited
US5557115A
Cited
EP0712148A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-28 | 2002-03-30 | 2002-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-28 | 2006-03-30 | 2006-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-28 | 2010-03-30 | 2010-09-29 | $7700.00 | Window Closed / Lapsed |