GB2142775A - Fluorescent lamp - Google Patents
Fluorescent lamp Download PDFInfo
- Publication number
- GB2142775A GB2142775A GB08413985A GB8413985A GB2142775A GB 2142775 A GB2142775 A GB 2142775A GB 08413985 A GB08413985 A GB 08413985A GB 8413985 A GB8413985 A GB 8413985A GB 2142775 A GB2142775 A GB 2142775A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosphor
- general formula
- fluorescent lamp
- rare
- europium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7777—Phosphates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7784—Chalcogenides
- C09K11/7787—Oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/38—Devices for influencing the colour or wavelength of the light
- H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
- H01J61/44—Devices characterised by the luminescent material
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
A fluorescent lamp has a phosphor film which is made of: a blue-emitting phosphor essentially consisting of at least one of a divalent europium activated aluminate phosphor having a general formula a(M, Eu)O &cirf& bAl2O3, and a divalent europium- and manganese-coactivated aluminate phosphor having a general formula a(M, Eu, Mn)O &cirf& bAl2O3, [where M is at least one of Zn, Mg, Ca, Sr, Ba, Li, Rb and Cs, and neither a nor b is zero]; a green-emitting phosphor essentially consisting of at least one of a cerium- and terbium-coactivated rare-earth silicophosphate phosphor having a general formula d(Lnl, Ce, Tb)2O3 &cirf& eSiO2 &cirf& fP2O5 [where LnI is at least one of Y, La, Gd, Lu and Sm, and none of d, e, and f is zero], and a rare-earth phosphate phosphor having a general formula (LnI, Ce, Tb)PO4 [where LnI is at least one of Y, La, Gd, Lu and Sm]; and a red-emitting phosphor essentially consisting of a europium- activated rare-earth oxide phosphor having a general formula (LnII, Eu)2O3 [where LnII is at least one of Y, La, Gd, Ce, Tb and Sm]. Tube-end blackening is greatly decreased by the phosphor combination in this fluorescent lamp.
Description
SPECIFICATION
Fluorescent lamp
The present invention relates to an improvement in a fluorescent lamp.
A three-peak emission system is known as one method of improving a color rendering property without sacrificing the efficacy of the fluorescent lamp. According to this system, three types of phosphors with peak wavelengths of about 450 nm, 540 nm, and 610 nm are used.
The half value widths of the light-emission spectra of these phosphors are relatively narrow. A blue-emitting phosphor having the light-emission-spectrum peak wavelength of about 450 nm comprises a divalent europium activated haloborophosphate phosphor such as a divalent europium activated-strontium-magnesium-calcium-cerium haloborophosphate phosphor. A greenemitting phosphor having the light-emission-spectrum peak wavelength of about 540 nm comprises a cerium-terbium activated silicophosphate phosphor (e.g., cerium-terbium activated lanthanum silicophosphate) or a cerium-terbium activated phosphate phosphor (e.g., a ceriumterbium activated lanthanum phosphate). A red-emitting phosphor having the light emission spectrum peak wavelength of about 610 nm comprises a europium activated yttrium oxide phosphor.
Another three-peak emission-type fluorescent lamp is described in Japanese Patent Disclosure (Kokai) No. 57-128778. This fluorescent lamp uses a combination of (Ba,Mg,Eu)O bAI203 as a blue emitting phosphor, MgO B203:Ce,Tb as a green-emitting phosphor, and (Y,Eu)203 as a redemitting phosphor.
The lamp diameter has recently been decreased to improve the luminous efficacy at a lower cost. In general, when the lamp diameter is decreased, the lamp tube wall load is increased. The end portions of the fluorescent lamp are blackened, thus resulting in a so-called blackening phenomenon. When the blackening phenomenon occurs in the fluorescent lamp, the brightness of the lamp is decreased.
In the conventional three-peak emission type fluorescent lamp having blue-, green- and redemitting phosphors, the blackening phenomenon typically occurs when a lamp having a diameter of 26 mm or less is used, thus resulting in poor appearance and lower lamp brightness.
The present invention had been made to overcome the drawbacks described above and has as its object to provide a fluorescent lamp with a high product value by greatly decreasing blackening at the end portions of the lamp.
The present inventors have made various types of experiments to achieve the above object and found that the blackening phenomenon was greatly decreased even when a tube diameter was 26 mm or less in a three peak emission type fluorescent lamp, wherein at least one of a divalent-europium-activated aluminate phosphor and manganese-activated aluminate phosphor was used instead of a conventional divalent-europium-activated haloborophosphate phosphor as the blue-emitting phosphor and was combined with the conventional green- and red-emitting phosphors. The present invention is based on this finding.
The phosphors used in the present invention are all known to those skiiled in the art and are subjected to the blackening phenomenon when they are used separately. However, when these phosphors are combined they decrease the blackening phenomenon to an extent which could not be expected in the case of using them separately. The decrease in the blackening phenomenon is based on an effect obtained by a combination of the different types of phosphors.
The blue-emitting phosphor used in the present invention essentially consists of at least one of a divalent-euopium-activated aluminate phosphor and a divalent-europium- and manganesecoactivated aluminate phosphor, said divalent-europium-activated aluminate phosphor having a general formula a(M,Eu)O bAI203 [where M is at least one of zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), lithium (Li), rubidium (Rb) and cesium (Cs), and neither a nor b is zero], and said divalent-europium-and manganese-coactivated aluminate phosphor having a general formula a(M,Eu,Mn)O bAI203 [where M, a, and b have the same meanings as defined above]. This blue-emitting phosphor is described in Japanese Patent
Disclosure Nos. 56-152882 and 56-152883 and Japanese Patent Publication No.
56-52072.
The green-emitting phosphor essentially consists of at least one of a cerium- and terbiumcoactivated rare-earth silicophosphate phosphor and a cerium- and terbium-coactivated rare-earth phosphate phosphor, said cerium- and terbium-coactivated rare-earth silicophosphate phosphor having a general formula d(Lnl,Ce,Tb)203 eSiO2 fP205 [where Lnl is at least one of yttrium (Y), lanthanum (La), gadolinium (Gd), lutetium (Lu) and samarium (Sm), and none of d, e, and f is zero], and said cerium- and terbium-coactivated rare-earth phosphate phosphor having a general formula (Lnl,Ce,Tb)PO4 [where Lnl has the same meanings as defined above].
A red-emitting phosphor essentially consists of a europium-activated rare-earth oxide phosphor having a general formula (Lnil,Eu)203 [where Lnll is at least one of yttrium (Y), lanthanum (La), gadolinium (Gd), cerium (Ce), terbium (Tb) and samarium (Sm)].
According to the present invention, there is provided a fluorescent lamp having a phosphor film which comprises:
a blue-emitting phosphor essentially consisting of at least one of a divalent-europium-activated aluminate phosphor and a divalent europium- and manganese-coactivated aluminate phosphor, said divalent-europium-activated aluminate phosphor having a general formula a(M,Eu) O bAI203 [where M is at least one of zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), lithium (Li), rubidium (Rb) and cesium (Cs), and neither a nor b is zero], and said divalent-euopium- and manganese-coactivated aluminate phosphor having a general formula a(M,Eu,Mn)O bAI203 [where M, a, and b have the same meanings as defined above];;
a green-emitting phosphor essentially consisting of at least one of a cerium- and terbiumcoactivated rare-earth silicophosphate phosphor and a cerium- and terbium-coactivated rare-earth phosphate phosphor, said silicophosphate phosphor having a general formula d(Lnl,Ce,Tb)203 e- SiO2 fP20s [where Lnl is at least one of yttrium (Y), lanthanum (La), gadolinium (Gd), lutetium (Lu) and samarium (Sm), and none of d, e, and f is zero], and said phosphate phosphor having a general formula (Lnl,Ce,Tb)PO4 [where Lnl has the same meanings as defined above]; and
a red-emitting phosphor essentially consisting of a europium-activated rare-earth oxide phosphor having a general formula (Lnll,Eu)2O3 [where Lnll is at least one of yttrium (Y), lanthanum (La), gadolinium (Gd), cerium (Ce), terbium (Tb), and samarium (Sm)].
A particularly preferable combination of phosphors is given to be a blue-emitting phosphor as a(M,Eu,Mn)O bAI203, a green-emining phosphor as d(Lnl,Ce,Tb)203-eSiO2-fP20, and a redemitting phosphor as (Lnll,Eu)2O3. By this combination, the blackening phenomenon becomes minimized, and a bright fluorescent lamp is obtained.
The phosphor film preferably has a composition consisting of 0.1 to 40% by weight of the blue-emitting phosphor, 20 to 73% by weight of the green-emitting phosphor, and 5 to 65% by weight of the red-emitting phosphor, where 100% by weight corresponds to the total content of the phosphors.
The fluorescent lamp of the present invention decreases the blackening at the end portions of the three peak emission-type fluorescent lamp described above.
This invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawing, in which:
The drawing is a graph showing the light-emission spectrum at the initial ON state of a fluorescent lamp according to an embodiment of the present invention.
Tube-end blackening represents a so-called blackening phenomenon at end portions of a fluorescent lamp while the lamp is turned on, thereby degrading the outer appearance of the lamp and hence lowering the product value.
Tube-end blackening occurs when a gas in the tube is activated to generate a discharge.
Tube-end blackening differs in accordance with the material emitted from the phosphors and the cathode or the type of gas sealed in the tube. However, the blackened portions always occur in the vicinity of the electrodes.
In order to evaluate tube end blackening, a predetermined blackened portion is cut so as to include tube glass and a phosphor screen, and a visible light transmittance of the blackened portion is measured. When blackening is increased, the visible light transmittance is decreased.
A blackened portion of a 40-W fluorescent lamp (tube diameter of 25 mm) having a phosphor film as previously described is subjected to visible light transmittance measurement. The visible light transmittance of the fluorescent lamp according to the present invention is compared with that of comparative fluorescent lamp having a divalent-europium-activated strontium-calciummagnesium-cerium haloborophosphate phosphor.
In this case, when the visible light transmittance of the fluorescent lamp is given to be 100%, the visible light transmittance of the comparative fluorescent lamp of the present invention is given to be 11 5%. The degree of blackening of the fluorescent lamp of the present invention is decreased by 15%. The tube-end blackening measurement must be performed after the lamp has been operated for a relatively long period of time. The 40-watt fluorescent lamp of the present invention and the conventional fluorescent lamp were turned on for 1,500 hours at a 130% rated load.Blackened portions (i.e., portion between a position spaced by 30 mm from the lamp end and a position spaced by 45 mm from the same lamp end along the longitudinal direction of the lamp) having a length of 1 5 mm and a width of 1 5 mm each are cut off from the lamps. These 1 5 X 1 5 (mm) blackened portions are given as samples. The visible light transmittances of these samples were measured by a Beckmann transmittance measuring instrument.
When the three-peak emission type fluorescent lamp is used as a fluorescent lamp of high color rendering property in practice, an average color rendering index (Ra) is 80 or more and a lamp efficacy is 80 Im/W or more. In order to provide these characteristics, the blue-, greenand red-emitting phosphors preferably have contents of 0.1 to 40% by weight, 20 to 73% by weight, and 5 to 65% by weight, respectively, when a total content of phosphors is given to be 100% by weight.
An alkali metal, boron oxide, gallium oxide or the like can be added to the respective blue-, green- and red-emitting phosphors in small amounts. The phosphors with such additives can be used to obtain the same effect as in the above embodiment.
The present invention will be described in detail by way of examples.
Example 1
A divalent-europium activated barium-magnesium aluminate phosphor having a formula 3(Ba,Mg,Eu)O.8Al203 is used as the blue-emitting phosphor. This phosphor is referred to as phosphor (A) hereafter. The phosphor (A) has a narrow light-emission spectrum having a peak wavelength of 452 nm and is suitable as a three-peak-emission-type blue-emitting phosphor.
For a comparative fluorescent lamp, a divalent-europium-activated strontium-magnesiumcerium haloborophosphate phosphor having the formula 3(Sr,Mg,Eu,Ce)00.92P,O,0.31 Ca- Cl2 0.09 B203 is used as the blue-emitting phosphor.-This phosphor is referred to as phosphor (B) hereafter.
11% by weight of the phosphor (A) as the blue-emitting phosphor, 67% by weight of a cerium- and terbium-coactivated lanthanum silicophosphate phosphor having the formula (La,Ce,Tb)2O30.2SiO20.9P2O5 as the green-emitting phosphor, and 22% by weight of a europium-activated yttrium oxide phosphor as the red-emitting phosphor were used to prepare a 40-W 5000-K white fluorescent lamp having a tube diameter of 25 mm of Example 1 by a conventional method. This lamp was turned on for 1,500 hours and was then subjected to visible light transmittance measurement.
On the other hand, the phosphor (B) as the blue-emitting phosphor, a cerium- and terbiumcoactivated lanthanum silicophosphate phosphor as the green-emitting phosphor, and a europium-activated yttrium oxide phosphor as the red-emitting phosphor were used to prepare as the comparative example a 40-watt 5000-K fluorescent lamp having a tube diameter of 25 mm.
The light-emission spectrum distribution of the fluorescent lamp of Example 1 in the initial ON period is shown in the drawing. The visible light transmittance of the comparative example was 100%, and that of Example 1 was 115%, thus decreasing the blackening effect by 15%.
Furthermore, the above phosphors were singly used to prepare similar fluorescent lamps, and these lamps were turned on for 1,500 hours. Visible light transmittances of these lamps having the phosphor (A), the phosphor (B), the (La,Ce,Tb)2O30.2SiO2.0.9P2O5 phosphor, and the (Y,Eu)203 phosphor were 92%, 90%, 104% and 101%, respectively.
Furthermore, as another comparative example, the same blue- and red-emitting phosphors as in Example 1, and MgO B203:Ce, Tb as a green-emitting phosphor were used to prepare a fluorescent lamp. This lamp was turned on for 1,500 hours, and its visible light transmittance was measured to be 99%.
Theoretically, a visible light transmittance of the three-peak emission-type lamp is expected to be 102% at best from the visible light transmittances of the respective phosphors measured above and the contents of the phosphors. However, in practice, the visible light transmittance in
Exampe 1 is obtained to be 115%. This is caused by a combined effect of the phosphors.
The average color rendering index (Ra) in the initial ON period is 84, and the lamp efficacy is 90 Im/W.
The above results are summarized in the following table.
Examples 2-7
The combination of phosphors was changed within the ranges of phosphor contents according to the present invention, and fluorescent lamps of Examples 2 to 7 were prepared in accordance with the same method as in Example 1.
In the fluorescent lamps as comparative examples, a 3(Sr,Mg,Eu,Ce,)O0.92P2O50.31Ca- Cl20.09B2O3 was used as the blue-emitting phosphor. Other conditions were the same as those in the respective examples. The visible light transmittances, the average color rendering indices, and lamp efficacies of Examples 2 to 7 are shown in the table. It should be noted that the visible light transmittances are given with respect to 100% visible light transmittance of the comparative example.
Table
Exmaple Phosphor composition Content Visible Average Lamp (wt.%) light color efficacy trans- rendering (#m/w) mittance index (Ra) (%) 3(Ba,Mg,Eu)O#8a#2O3 11 1 (La,Ce,Tb)2O3#0.2SiO2#0.9P2O5 67 115 84 90 (Y,Eu)2O3 33 3(Ba,Mg,Eu,Mn)O#8A#2O3 10 2 (La,C#,Tb,Gd)2O3#0.3SiO2#0.85P2O5 66 110 86 87 (Y,Eu,Tb)2O3 24 2.8(Ba,Mg,Zn,Eu,Mn)0.8A#2O3 10 3 (La,Ce,Tb)PO4 70 104 86 84 (Y,Eu,Sm)2O3 20 2.8(Ba,Mg,Eu)O#0,798A#2O3#0.02B2O3 14 4 (La,Ce,Tb,Lu)2O3#0.2SiO2#0.9P2O5 65 113 84 89 (Y,Eu)2O3 21
Example Phosphor composition Content Visible Average Lamp (wt.%) light color efficacy trans- rendering (#m/w) mittance index (Ra) (%) 3(Ba,Mg,Ca,Li,Eu)O#8A#2O3 16 5 (La,Ce,Tb,Y)2O3#0.24SiO2#0.88P2O5 60 113 85 83 (Y,Eu,La)2O3 24 3(Ba,Mg,Zn,Rb,Eu,Mn)O 8A#2O3 20 6 (La,Ce,Tb,Sm)2O3#0.26SiO2#0.87P2O5 54 112 86 85 (Y,Eu,Ce)2O3 26 3(Ba,Mg,Sr,Cs,Eu)O#8A#2O3 23 7 (La,Ce,Tb)PO4 54 106 84 87 (Y,Eu,Gd)2O3 23
Claims (3)
1. A fluorescent lamp having a phosphor film which comprises:
a blue-emitting phosphor essentially consisting of at least one of a divalent-europium-activated aluminate phosphor and a divalent-europium- and manganese-coactivated aluminate phosphor, said divalent-europium-activated aluminate phosphor having a general formula a(M,Eu)O bAI203 [where M is at least one of zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), lithium (Li), rubidium (Rb) and cesium (Cs), and neither a nor b is zero], and said divalenteuropium- and manganese-coactivated aluminate phosphor having a general formula a(M,Eu,Mn)O bAI203 [where M is at least one of zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), lithium (Li), rubidium (Rb) and cesium (Cs), and neither a nor b is zero];;
a green-emitting phosphor essentially consisting of at least one of a cerium- and terbiumcoactivated rare-earth silicophosphate phosphor and a cerium- and terbium-coactivated rare-earth phosphate phosphor, said cerium- and terbium-coactivated rare-earth silicophosphate phosphor having a general formula d(Lnl,Ce,Tb)203 eSiO2 fP205 [where Lnl is at least one of yttrium (Y), lanthanum (La), gadolinium (Gd), lutetium (Lu) and samarium (Sm), and none of d, e, and f is zero], and said cerium- and terbium-coactivated rare-earth phosphate phosphor having a general formula (Lnl,Ce,Tb)PO4 [where Lnl is at least one of yttrium (Y), lanthanum (La), gadolinium (Gd), lutetium (Lu) and samarium (Sm)]; and
a red-emitting phosphor essentially consisting of a europium-activated rare-earth oxide phosphor having a general formula (Lnll,Eu)2O3 [where Lnil is at least one of yttrium (Y), lanthanum (La), gadolinium (Gd), cerium (Ce), terbium (Tb) and samarium (Sm)].
2. A lamp according to claim 1, wherein said phosphor film contains 0.1 to 40% by weight of said blue-emitting phosphor, 20 to 73% by weight of said green-emitting phosphor, and 5 to 65% by weight of said red-emitting phosphor wherein 100% by weight corresponds to the total weight of said phosphors.
3. A fluorescent lamp, substantially as hereinbefore described with reference to Examples 1-7.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58100201A JPS59226087A (en) | 1983-06-07 | 1983-06-07 | Fluorescent lamp |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8413985D0 GB8413985D0 (en) | 1984-07-04 |
| GB2142775A true GB2142775A (en) | 1985-01-23 |
| GB2142775B GB2142775B (en) | 1986-09-17 |
Family
ID=14267684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08413985A Expired GB2142775B (en) | 1983-06-07 | 1984-06-01 | Fluorescent lamp |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS59226087A (en) |
| KR (1) | KR890001231B1 (en) |
| CS (1) | CS247082B2 (en) |
| GB (1) | GB2142775B (en) |
| HU (1) | HU187992B (en) |
| SG (1) | SG14088G (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0199200A3 (en) * | 1985-04-22 | 1988-02-17 | General Electric Company | Fluorescent lamp using phosphor blend |
| EP0287167A1 (en) * | 1987-04-14 | 1988-10-19 | Koninklijke Philips Electronics N.V. | Luminescent barium-hexa-aluminate, luminescent screen provided with such an aluminate and low-pressure mercury vapour discharge lamp provided with such a screen |
| EP0418902A2 (en) * | 1989-09-20 | 1991-03-27 | Kasei Optonix, Ltd. | Fluorescent lamp, process for its production and phosphor used therefor |
| EP0529956A1 (en) * | 1991-08-23 | 1993-03-03 | Kabushiki Kaisha Toshiba | Blue phosphor and fluorescent lamp using the same |
| EP0600366A1 (en) * | 1992-12-04 | 1994-06-08 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Samarium-activated phosphor |
| WO1994029403A1 (en) * | 1993-01-13 | 1994-12-22 | Mickellsun Pty. Ltd. | Luminescent material |
| AU661941B2 (en) * | 1993-04-28 | 1995-08-10 | Nemoto & Co., Ltd | Phosphorescent phosphor |
| GB2301372A (en) * | 1995-05-29 | 1996-12-04 | Nichia Kagaku Kogyo Kk | Afterglow lamp comprising a long decay phosphor containing activated europium oxide |
| US6157126A (en) * | 1997-03-13 | 2000-12-05 | Matsushita Electric Industrial Co., Ltd. | Warm white fluorescent lamp |
| EP1256616A2 (en) * | 2001-05-12 | 2002-11-13 | Philips Corporate Intellectual Property GmbH | Plasma display panel with blue phosphor |
| EP1480247A1 (en) * | 2002-09-27 | 2004-11-24 | Matsushita Electric Industrial Co., Ltd. | Plasma display |
| WO2006113656A1 (en) * | 2005-04-19 | 2006-10-26 | Gelcore Llc | Red phosphor for led based lighting |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61258891A (en) * | 1985-05-10 | 1986-11-17 | Matsushita Electronics Corp | Fluorescent material |
| JPS61258892A (en) * | 1985-05-13 | 1986-11-17 | Matsushita Electronics Corp | Fluorescent lamp |
| JPH0794658B2 (en) * | 1986-02-14 | 1995-10-11 | 化成オプトニクス株式会社 | High color rendering fluorescent lamp |
| JPH0735510B2 (en) * | 1986-03-20 | 1995-04-19 | 松下電子工業株式会社 | Fluorescent lamp |
| JPS6412455A (en) * | 1987-07-07 | 1989-01-17 | Matsushita Electronics Corp | Electric bulb color fluorescent lamp |
| JP2653576B2 (en) * | 1990-08-31 | 1997-09-17 | 株式会社東芝 | Low pressure mercury vapor discharge lamp |
| JP2002285147A (en) * | 2001-03-22 | 2002-10-03 | Nec Lighting Ltd | Fluorescent substance and lamp using the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5740853A (en) * | 1980-08-22 | 1982-03-06 | Nichia Denshi Kagaku Kk | Mercury vapor discharge lamp |
-
1983
- 1983-06-07 JP JP58100201A patent/JPS59226087A/en active Granted
-
1984
- 1984-06-01 GB GB08413985A patent/GB2142775B/en not_active Expired
- 1984-06-01 KR KR1019840003064A patent/KR890001231B1/en not_active IP Right Cessation
- 1984-06-05 HU HU842175A patent/HU187992B/en not_active IP Right Cessation
- 1984-06-06 CS CS844289A patent/CS247082B2/en unknown
-
1988
- 1988-03-01 SG SG140/88A patent/SG14088G/en unknown
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0199200A3 (en) * | 1985-04-22 | 1988-02-17 | General Electric Company | Fluorescent lamp using phosphor blend |
| EP0287167A1 (en) * | 1987-04-14 | 1988-10-19 | Koninklijke Philips Electronics N.V. | Luminescent barium-hexa-aluminate, luminescent screen provided with such an aluminate and low-pressure mercury vapour discharge lamp provided with such a screen |
| EP0418902A2 (en) * | 1989-09-20 | 1991-03-27 | Kasei Optonix, Ltd. | Fluorescent lamp, process for its production and phosphor used therefor |
| EP0418902A3 (en) * | 1989-09-20 | 1991-11-06 | Kasei Optonix, Ltd. | Fluorescent lamp, process for its production and phosphor used therefor |
| EP0529956A1 (en) * | 1991-08-23 | 1993-03-03 | Kabushiki Kaisha Toshiba | Blue phosphor and fluorescent lamp using the same |
| EP0600366A1 (en) * | 1992-12-04 | 1994-06-08 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Samarium-activated phosphor |
| WO1994029403A1 (en) * | 1993-01-13 | 1994-12-22 | Mickellsun Pty. Ltd. | Luminescent material |
| AU661941B2 (en) * | 1993-04-28 | 1995-08-10 | Nemoto & Co., Ltd | Phosphorescent phosphor |
| GB2301372A (en) * | 1995-05-29 | 1996-12-04 | Nichia Kagaku Kogyo Kk | Afterglow lamp comprising a long decay phosphor containing activated europium oxide |
| GB2301372B (en) * | 1995-05-29 | 1998-12-02 | Nichia Kagaku Kogyo Kk | Afterglow lamp |
| US5859496A (en) * | 1995-05-29 | 1999-01-12 | Nichia Chemical Industries, Ltd. | Lamp containing long decay phosphor |
| US6157126A (en) * | 1997-03-13 | 2000-12-05 | Matsushita Electric Industrial Co., Ltd. | Warm white fluorescent lamp |
| EP1256616A2 (en) * | 2001-05-12 | 2002-11-13 | Philips Corporate Intellectual Property GmbH | Plasma display panel with blue phosphor |
| EP1256616A3 (en) * | 2001-05-12 | 2005-10-05 | Philips Intellectual Property & Standards GmbH | Plasma display panel with blue phosphor |
| EP1480247A1 (en) * | 2002-09-27 | 2004-11-24 | Matsushita Electric Industrial Co., Ltd. | Plasma display |
| EP1480247A4 (en) * | 2002-09-27 | 2010-09-29 | Panasonic Corp | Plasma display |
| WO2006113656A1 (en) * | 2005-04-19 | 2006-10-26 | Gelcore Llc | Red phosphor for led based lighting |
| US7329371B2 (en) | 2005-04-19 | 2008-02-12 | Lumination Llc | Red phosphor for LED based lighting |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2142775B (en) | 1986-09-17 |
| JPS6244034B2 (en) | 1987-09-17 |
| HU187992B (en) | 1986-03-28 |
| SG14088G (en) | 1988-07-08 |
| JPS59226087A (en) | 1984-12-19 |
| KR890001231B1 (en) | 1989-04-27 |
| CS247082B2 (en) | 1986-11-13 |
| GB8413985D0 (en) | 1984-07-04 |
| HUT34640A (en) | 1985-03-28 |
| KR850000772A (en) | 1985-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) |
Effective date: 19981010 |
|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20040531 |