EP0199200A2
Expired / Lapsed
EP
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Fluorescent lamp using phosphor blend
Assignee: General Electric Co
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Filing: 1986-04-10
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Granted: —
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Expires: 2006-04-10
Abstract
Abstract fluorescent lamp is disclosed utilizing a particular phosphor combination producing efficient illumination at a lower cost than conventional phosphors now in use. The disclosed phosphor combination can be used as a. blended mixture either alone or with other phosphors to provide the desired results.
Inventors
- 👤 Mary Virginia Hoffman
- 👤 John Paynter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 08:17
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7777; C09K11/7783; C09K11/7784; C09K11/7787
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
17 words
What we claim as new and desire to secure by Letters Patent of the United States is:
Claim 2
Dependent Claim
106 words
In a fluorescent lamp comprising a glass envelope having electrodes at its ends, a mercury and inert gas filling within said glass envelope, and a phosphor coating deposited on the interior surface of said glass envelope, the improvment which comprises using a blended mixture of a lanthanum cerium orthophosphate phosphor activated with terbium ion having the general formula: wherein x is in the approximate range 0.05-0.60, and y is in the approximate range 0.05-0.20, with a europium-activated yttrium oxide phosphor having the general forumla: wherein a is in the approximate range 0.015-0.040, said phosphor combination producing higher luminous efficiency than is obtained with conventional phosphor blends.
Claim 3
Dependent Claim
15 words
A fluorescent lamp as in claim 1 wherein said glass envelope comprises a cylindrical tube.
Claim 4
Dependent Claim
20 words
A fluorescent lamp as in claim 1 wherein said phosphors are blended in pre-determined amounts to produce white color illumination.
Claim 5
Dependent Claim
30 words
A fluorescent lamp as in claim 1 wherein said phosphor combination further includes a blue color emission phosphor and said phosphors are blended in pre-determined amounts to produce white color,illumination.
Claim 6
Dependent Claim
30 words
A fluorescent lamp as in claim 1 wherein said phosphor combination is deposited as a layer upon the surface of a white color emission phosphor deposited on the glass surface.
Claim 7
Dependent Claim
30 words
A fluorescent lamp as in claim 1 wherein said phosphor combination is deposited as a layer upon the surface of an optically transparent conductive coating deposited on the glass surface.
Claim 8
Dependent Claim
145 words
In a fluorescent lamp comprising a tubular shaped glass envelope having electrodes at its ends, a mercury and inert gas filling which produces a low-pressure discharge of ultraviolet radiation, and a phosphor coating deposited on the interior surface of said glass envelope, the improvement which comprises using a blended mixture of narrow band emitting phosphors, said phosphors including a blue color emission phosphor, a lanthanum cerium orthophosphate phosphor activated with terbium ion having the general formula: wherein x is in the approximate range 0.05-0.60, and y is in the approximate range 0.05-0.20, with a europium-activated yttrium oxide phosphor having the general formula: wherein a is in the approximate range 0.015-0.040, said phosphors being mixed together in pre-determined amounts to produce white color illumination at a color temperature up to about 7000 * K and at higher luminous efficiency than is obtained with conventional phosphor blends.
Claim 9
Dependent Claim
32 words
A fluorescent lamp as in claim 7 wherein said blue color emission phosphor is selected from europium-activated strontium chlorophosphate, europium-activated strontium barium calcium chlorophosphate, and europium-activated barium magnesium aluminate, including mixtures thereof.
Claim 10
Dependent Claim
30 words
A fluorescent lamp as in claim 7 wherein said phosphor mixture is deposited as a layer upon the surface of a white color emission phosphor deposited on the glass surface.
Claim 11
Dependent Claim
30 words
A fluorescent lamp as in claim 7 wherein said phosphor coating is deposited as a layer upon the surface of an optically transparent conductive coating deposited on the glass surface.
References Cited (Backward Citations)
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