EP0093399A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ce-Mn coactivated fluoroapatite phosphors as the yellow emitting component for high efficacy lamp blends, process for producing same, and a fluorescent lamp containing same
Assignee: Verizon Laboratories Inc
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Filing: 1983-04-27
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Granted: —
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Expires: 2003-04-27
Abstract
Abstract ellow emitting fluorescent lamp phosphor compositions comprise cerium and manganese activated alkali-earth fluoroapatite compositions containing sodium having the approximate formula wherein s is from 0 to 1 t is from about 3.43 to about 4.01 v is about 0.3 w is about 0.3 x is from about 0.3 to about 0.4 y is about 3.00 z is from about 1.0 to about 4.0. A process for producing the disclosed phosphors is described and an improved fluorescent lamp (10) employing the disclosed phosphors (38) comprises an elongated sealed glass envelope (12) of circular cross section. It has the usual electrodes (14, 16) at each end supported by lead-in wires (18, 20 and 22, 24, respectively) which extend through glass presses (26, 28) in mount stems (30, 32) to the contacts in bases (34, 36) affixed to the ends of the lamp (10).
Inventors
- 👤 Romano G. Pappalardo
- 👤 Thomas E. Peters
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:36
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7723; C09K11/7724; C09K11/7725; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
A luminescent composition comprising cerium and manganese activated alkali-earth fluoroapatite compositions containing sodium having the approximate formula wherein s is from 0 to 1 t is from about 3.43 to about 4.01 v is about 0.3 w is about 0.3 x is from about 0.3 to about 0.4 y is about 3.00 z is from about 1.0 to about 4.0, and wherein manganese being in the divalent state, and cerium being in the trivalent state.
Claim 2
Dependent Claim
75 words
A luminescent composition comprising cerium and manganese activated alkali-earth fluoroapatite compositions containing sodium having the approximate formula wherein s is from 0 to 1 t is from about 3.43 to about 4.01 v is about 0.3 w is about 0.3 x is from about 0.3 to about 0.4 y is about 3.00 z is from about 1.0 to about 4.0, and wherein manganese being in the divalent state, and cerium being in the trivalent state.
Claim 3
Dependent Claim
105 words
A fluorescent lamp comprising a light-transmitting envelope having electrodes, an inert ionizable gas and a charge of mercury therein and a coating of phosphor on the inside surface of said envelope, said phosphor comprising cerium and manganese activated calcium-strontium fluoroapatite composition containing sodium having the approximate formula wherein s is from 0 to 1 t is from about 3.43 to about 4.01 v is about 0.3 w is about 0.3 x is from about 0.3 to about 0.4 y is about 3.0 z is from about 1.0 to about 4.0, and wherein manganese being in the bivalent state, and cerium being in the trivalent state.
Claim 4
Dependent Claim
105 words
A fluorescent lamp comprising a light-transmitting envelope having electrodes, an inert ionizable gas and a charge of mercury therein and a coating of phosphor on the inside surface of said envelope, said phosphor comprising cerium and manganese activated calcium-strontium fluoroapatite composition containing sodium having the approximate formula wherein s is from 0 to 1 t is from about 3.43 to about 4.01 v is about 0.3 w is about 0.3 x is from about 0.3 to about 0.4 y is about 3.0 z is from about 1.0 to about 4.0, and wherein manganese being in the bivalent state, and cerium being in the trivalent state.
Claim 5
Dependent Claim
93 words
A process for producing cerium and manganese activated calcium-strontium fluoroapatite luminescent material composition containing sodium according to claim 1 comprising: comminuting said material composition to form a thoroughly mixed powder blend; firing said blend for about 1 to about 1.5 hours at about 900°C to about 1050°C in about 1.0 /minute flow of N 2 containing 5% H 2 ; first cooling step of said fired blend by cooling to about 700°C in about 2 hours; second cooling step of said fired blend by cooling to about 25°C; and milling said fired blend.
Claim 6
Dependent Claim
24 words
A process according to claim 3 wherein the N 2 containing 5% H 2 is bubbled through water maintained at a temperature of 21°C.
References Cited (Backward Citations)
GB792598A
Cited
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