GB2259095A - Green light emitting aluminate phosphor - Google Patents
Green light emitting aluminate phosphor Download PDFInfo
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- GB2259095A GB2259095A GB9214599A GB9214599A GB2259095A GB 2259095 A GB2259095 A GB 2259095A GB 9214599 A GB9214599 A GB 9214599A GB 9214599 A GB9214599 A GB 9214599A GB 2259095 A GB2259095 A GB 2259095A
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- Prior art keywords
- light emitting
- green light
- aluminate phosphor
- phosphor
- emitting aluminate
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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
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
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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
- C09K11/7715—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing cerium
- C09K11/7721—Aluminates
-
- 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)
Abstract
The invention relates to a green light emitting cerium strontium aluminate phosphor activated with terbium and/or manganese of the general formula (Ce1-m-n TbmSrn)MnpMgq AlrO1.5(1+r)+p+g-0.5n (I) wherein O </= m </= O.4; 0 < n </= 0.8; 0.3 </= m + n </= 0.9; 0 </= q </= 2; and 10 </= r </= 20. A process for the preparation of the green light emitting aluminate phosphor and a fluorescent lamp containing the green light emitting aluminate phosphor are also described. <IMAGE>
Description
GREEN LIGHT EMITTING ALUMINATE PHOSPHOR
The invention relates to a green light emitting aluminate phosphor.
More particularly, the invention relates to a cerium strontium aluminate phosphor activated with terbium and/or manganese.
Fluorescent lamps of the three band type have recently been developed having blue, red and green component phosphors with emission peaks at about 450nm, 610nm and 545nm, respectively. In such lamps, the terbium activated cerium aluminate phosphor (Ce0.67Tb0.33)Ml11O19 [JECS; 121 (1974) 1627] is generally used as the green component phosphor.
Terbium activated rare earth aluminate phosphors are also disclosed in
British Patent No. 1,458,700 and United States Patent No. 4,382,207. The class of aluminate phosphors disclosed in these patents are of the general formula
La1-x-y CexTbxMgAl11O19 wherein 0.20 # x # 0.80, 0.10 # y # 0.40 and x + y < - 1.0. When these aluminate phosphors are used in low pressure mercury vapour discharge lamps, the mercury 254nm radiation is absorbed by the Ce3 + ions which transfer the absorbed energy to the neighbouring Tb3 + ions and green light is emitted by the Tb3+ ions having an emission peak at about 544nm.
In aluminate phosphors, there is no excitation migration between Ce3 + ions [J.Lumin, 18 (1979) 809]. Therefore, a higher terbium content (atom ratio is 33%) must be incorporated to achieve a satisfactory luminous flux However, the source of terbium, namely Tb407, is an expensive rare earth oxide and results in these aluminate phosphors being costly.
Furthermore, the strongest excitation band of Ce3 + ions in the aluminate phosphors is located at about 285nm which does not correspond to mercury 254am radiation so that it is difficult to improve the luminous flux of the phosphors. It is also known that Ce3 + ions may possess different chemical valencies and in 185nm UV radiation, Ce3 + ions would to some extent form
Ce4+ ions. Ce4+ ions strongly absorb 254am radiation, but do not fluoresce which leads to reduction of luminous flux maintenance of the lamp. When used in compact fluorescent lamps in which the mercury 185nm radiation is strong, the decline of phosphors containing higher Ce3 + ion content would be higher compared with phosphors having a lower Ce3 + ion content.Although a lower cerium content may be achieved in the aluminate phosphors if some of the cerium is replaced by lanthanum, this will result in a reduction of the brightness of the phosphors which is undesirable.
In the conventional process for the preparation of rare earth aluminate phosphors, the mixture of reactants which produce the phosphors needs be fired at an elevated temperature of about 1550 0C to 1700 "C in a reducing atmosphere such as nitrogen containing hydrogen or in a protecting atmosphere such as nitrogen or argon. Therefore, the preparation of the phosphor on a large scale is difficult. Furthermore, the phosphor prepared by this process has a large grain size and a low specific surface area which is unfavourable for phosphor use in fluorescent lamps.
We have now found a class of green light emitting aluminate phosphors which possess different chemical and physical characteristics to the aforementioned aluminate phosphors and may be used in fluorescent lamps and the like. Such aluminate phosphors have a fine grain size and a large specific surface area and can be prepared by a simpler process than the commercial process currently employed.
According to the present invention there is provided a green light emitting aluminate phosphor of the general formula:
(Ce1-m-nTbmSrn)MnpMgqAlO1,5(1+r)+p+g-0.5n (I) wherein 0 # m # 0.4; 0 < n # 0.8; 0.3 # m+n # 0.9; 0 # p # 1.0; 0 # q s2; and 10 # r # 20.
The compound of the formula (I) may also be expressed by the general formula: aCe2O3#bTb2O3#cSrO#dMgO#eAl2O3#fMnO (II) wherein
0.05 < a s 0.35; 0 # b # 0.2; 0 < c 10.8; 0 # d # 2; 5 # e # 100; and 0 # f # 1.0.
The aluminate phosphor of the invention may be activated by terbium and/or manganese.
The aluminate phosphor activated by terbium is preferably of the general formula:
(Ce1-m-n-TbmSrn)MgxAl12+yO19+z (III)
wherein
0.4 2 m > 0;
0.8 #n > 0; 2 # x # 0; 8 # y # 0; and'
13 # z > 0.
Suitably the aluminate phosphors activated by terbium are selected from:
Ce0.55Tb0.30Sr0.15Ng0.85Al12O20.275;
Ce0.55Tb0.30Sr0.15Mg0.35Al14O23.275;
Ce0.40Tb0.30Sr0.30Mg0.70Al12O20.05; and
Ce0.40Tb0.30Sr0.30Mg0.70Al13O21.55.
The aluminate phosphor activated by manganese is preferably of the general formula:
(Ce1-nSrn)MgyMnxAl12+yO19+z (IV)
wherein
0.8 > n > 0; 1 # v # 0; 1 #x > 0; 8 # y # 0; and
13 # z # 0.
The aluminate phosphor activated by manganese is suitably selected from:
Ce0.4Sr0.6Mg0.2Mn0.2Al12O19.6;
Ce0.3Sr0.7Mg0.1Mn0.2Al12O19.45; and
Ce0.2Sr0.8Mn0.2Al12O19.45.
The aluminate phosphor activated by terbium and manganese is preferably selected from:
(Ce1-m-nTbmSrn)MgvMnxAl12+yO19+z (V)
wherein 0.4 > m > 0;
0.8 > n > 0;
1 # v # 0;
1 # x # 0; 8 # y r 0 and 13 # z # 0.
Particularly suitable aluminate phosphors activated by terbium and manganese are selected from:
Ce0.55Tb0.25Sr0.2Mg0.8Mn0.05Al12O20.25;
Ce0.55Tb0.25Sr0.20Mg0.30Mn0.05Al12O20.25;
Ce0.45Tb0.25Sr0.30Mg0.55Mn0.05Al12O19.975; and
Ce0.20Tb0.20Sr0.60Mg0.40Mn0.10Al12O19.70.
According to another aspect of the present invention there is provided a process for the preparation of a green emitting aluminate phosphor of the general formula (I) which comprises the steps of:
(a) mixing one or more oxides or oxide sources containing the
component metals to form an ad mixture;
(b) firing the admixture in air at 1400 to 1550 0C; (c) pulverizing the fired admixture from step (b); and
(d) subjecting the pulverized admixture from step (c) to firing at
1150 to 1250 0C in a reducing atmosphere.
In a preferred embodiment the aluminate phosphors of the invention are prepared from the solid solution of CeMgAl11O19, SrAl12O19 and A1203 in which terbium and/or manganese are incorporated. In the solid solution compounds, the positions of excitation and emission of Ce3 + ions shift regularly with SrA112019 content.With increasing strontium content, the
Ce3 + absorption peak at longer wavelength shifts from 285nm to 250nm, whereas the emission peak shifts from 365nm to 330nm. Thus, the Ce3 + absorption for mercury 254nm radiation as well as the spectral overlap between Ce3 + emission and Tb3 + absorption (330-350nm) will be improved compared with the prior art aluminate phosphor Ce067Th033MgAl11O19. As a result of change of Ce3 + absorption and emission positions, the spectral energy overlap between emission and absorption of Ce3 + ions will increase which facilitates Ce3 ± Ce3 + energy transfer. All these are favourable for efficient Ce3 + - Tb3 + energy transfer which is necessary for efficient Tb3 + activated green fluorescent phosphor. Thus, the aluminate phosphors of the invention provide efficient green emitting cerium strontium aluminate phosphors having lower terbium and cerium contents.
Preferably the cerium content of the cerium strontium aluminate phosphors is 0.1 to 0.7 gram atom, more preferably 0.3 to 0.5 gram atom so as to reduce the decline of the phosphors during the life of lamp.
Cerium strontium aluminate phosphors which are activated by Mn2 + ions may achieve an excitation energy from Ce3 + ions through Ce3 + - Mn2 + energy transfer and emit green light with about 515 nm as maximum. It will be appreciated that the aluminate phosphors of the invention also include
Mn2 + activated and Mn2 + and Tub3 + co-activated cerium strontium aluminate phosphors. In the latter, the Mn2 + fluorescence is utilized either for increasing the phosphor brightness or for reducing terbium content.
The cerium strontium aluminate phosphor is preferably produced by a solid reaction. The raw materials used are oxides or an oxide source of the the component metals, such as, for example, CeO2, Tub407, SrCO3, MgO (or
MgCO3), Al203(or Al(OH)3), Mn(N03)2(or manganese acetate) the amounts of which are determined according to the aluminate phosphor composition represented by the formula (I) and (II).
A particularly preferred process for preparing the cerium strontium aluminate phosphors of the invention comprises the steps of:
(a) forming a mixture of CeO2 and Tb407;
(b) mixing the oxides from step (a) with one more oxides or oxide
sources containing the other component metals to form an
admixture;
(c) firing the admixture from step (b) at 1400" to 1550 0 for 2 to 6
hours;
(d) pulverizing the product from step (c); and
(e) firing the pulverized product from step (d) in a carbon powder or
nitrogen containing hydrogen reducing atmosphere at from 1150 to 12500C for 2 to 4 hours.
The CeO2/Tb407 mixture in step (a) may be prepared by mixing the individual oxides together or more preferably, by first producing an oxalate precipitate containing cerium and terbium, e.g. by dissolving the oxides in nitric acid and preciptating the oxalate(s), and then decomposing the oxalate precipitate into oxides at temperatures from 1000 to 1100 C.
It is preferred to mix the various oxides in step (b) by ball-milling.
The cerium strontium aluminate phosphor prepared by this particularly preferred process has a median particle size range of about 5 microns diameter and a special surface area of about 4000 cm2/g when formed to provide a material-saving in fluorescent lamps as compared with the larger particle size and smaller special surface area commercial phosphors of the type (Ce,Tb)MgAl1lOlg now being employed therein. Moreover, step (d) of the process does not need a reducing or protecting atmosphere, whereas step (f) in a reducing atmosphere is carried out only at lower temperatures from 1150 to 1250 "C. Thus, the production of cerium strontium aluminate phosphor on a large scale can be achieved at a lower cost.
According to a further aspect of the present invention there is provided a luminescent coating for a fluorescent lamp which comprises a green light emitting aluminate phosphor as defined above.
The luminescent coating may further comprise a red light emitting phosphor and/or a blue light emitting phosphor. Preferably the red light emitting phosphor is (Y, Eu)2 03. The ratio of the green light emitting aluminate phosphor to red light emitting phosphor is preferably 30 : 70.
The present invention also provides a fluorescent lamp including a lamp envelope having a luminescent coating on the inside surface thereof, said luminescent coating being as defined above.
Fluorescent lamps having a luminescent coating layer defined above possess higher luminous flux and good colour rendition.
Fluorescent lamps having the luminescent coating defined above may be of common physical forms currently available.
Example 1
Cerium oxide (CeO2) and terbium oxide (tub407) were dissolved in nitric acid to prepare 82 of a solution containing 0.55 gram atoms of cerium, 0.30 gram atoms of terbium. This solution was gradually added into 8 9 of solution containing 2 moles of oxalic acid. The resulting precipitate of oxalate was filtered and dried. This oxalate was converted into an oxide by heating at 1000C to 1100 C for approximately 1 hour. The oxide was mixed with 0.15 mole of strontium carbonate, 0.85 mole of magnesium oxide, 6 moles of alumina and 0.05 mole of boric acid. The admixture was ball-milled for 12 hours and then fired in air at 1500 0C for 3 hours. The product of firing was pulverized.The product of pulverizing was fired at 1200 "C for 2 hours in a reducing atmosphere (nitrogen containing hydrogen). The fired product was sieved to obtain a terbium - activated cerium strontium aluminate phosphor.
The composition of this phosphor was
Ce0.55Tb0.30Sr0.15Mg0.85Al12O20.275.
This phosphor has a median particle size of about 5 microns diameter and a special surface area of about 4000 cm2/g. When excited by ultraviolet light at 254 nm, this phosphor strongly emitted green light and produced an emission spectrum with a peak at 452nm. The powder brightness was 103 as shown in Table 1.
Examples 2 to 4
Using the same process as described in Example 1, the ratios of ingredient metals of phosphor were varied. The compositions and powder brightness of the phosphors are shown in Table 1.
Examples 5 to 7
Using the same process as described in Example 1, the cerium strontium aluminate phosphors comprising manganese as co-activator were prepared. In the preparation of the phosphors comprising manganese, manganese nitrate or manganese acetate were used as starting materials. The phosphors are shown in Table 1. These phosphors exhibited the Tb3 + emission as well as the Mn2 + emission, peaking at about 515nm when excited by ultraviolet radiation at 254nm. Figure 1 shows the emission spectrum of the phosphor having the composition according to Example 5.
Table 1
Example Somber Phosphor Powder
Composition Brightness
1 Ce0.55Tb0.30Sr0.15Mg0.85Al12O20.275 103
2 Ce0.55Tb0.30Sr0.15Mg0.85Al14O23.275 102
3 Ce0.40Tb0.30Sr0.30Mg0.70Al12O20.05 105
4 Ce0.40Tb0.30Sr0.30Mg0.70Al13O21.55 105
5 Ce0.55Tb0.25Sr0.20Mg0.80Mn0.05Al1 12020.25 102
6 Ce0.45Tb0.25Sr0.30Mg0.55Mn0.05Al12O19.975 100
7 Ce0.20Tb0.20Sr0.60Mg0.40Mn0.10Al1 2019.70 98
* The powder brightness of Ceo7Tbos3oMgAlllol9was taken as 100
for comparison.
Example 8
0.4 mole of CeO2, 0.6 mole of SrCO3, 0.2 mole of Mn(CH3COO)2 and 6 moles of A1203 were fired in air at 1500 C for 3 hours. The product obtained was pulverized and sieved and then subjected to a second firing treatment for 2 hours in a carbon powder reducing atmosphere at 1200 C.
The Mn2 + green emission is shown in Figure 2. The phosphor has a brightness of 100 compared with the prior art phosphor Zn2SiO4:Mn2 +.
Examples 9 and 10
Using the same process as described in Example 8, Mn2 + - activated cerium strontium aluminate phosphors having different compositions were obtained. The compositions and powder brightness of these phosphors are shown in Table 2.
Table 2
Example Number Phosphor Powder *
Brightness
9 Ce0.4Sr0.6Mn0.2Mn0.2Al12O19.6 100
10 Ce0.3Sr0.7Mn0.1Mn0.2Al12O19.45 102
11 Ce0.2Sr0.8Mn0.2Al12O19.45 104
Examples 11 and 12
About 30% by weight Ce0.4Tb0.3Sr0.3Mg0.7Al12O20.05 in Example 3 as a green phosphor and about 70% by weight of (Y,Eu)203 as a red phosphor were mixed together. The mixture was coated on the inner surface of glass tubes to prepare 2 n type compact fluorescent lamps with 2700 K colour temperature. The results of measurements of luminous flux and colour rendition are shown in Table 3.
Table 3
Example Lamp Type Power (W) Colour Colour Luminous
Number Temp. Rendering Flux at 0 Index (Ra) hour
11 2s 10W 2700K 85 650 Lm
12 2# 14 W 2700K 85 910 Lm Example 13 and 14
Ce0.55Tb0.25Sr0.20Mg0.80Mn0.05Al12O20.25 in Example 5 as a green phosphor and (Y,Eu)203 as a red phosphor were mixed in the ratios of 30% to 70% and 35% to 65% by weight, respectively. The mixtures were used as luminescent coating layers for 2U type compact fluorescent lamps. The results of the measurement of luminous flux and colour rendition are shown in Table 4.
Table 4
Example Lamp Type Power Colour Colour Luminous
Number Temp. Rendering Flux at 0
Index (Ra) hour
13 2U 9 W 2700K 85 545 Lm
14 2U 9W 3200K 81 550 Lm
Claims (19)
1. A green light emitting aluminate phosphor of the general formula
(Ce1-m-nTbmSrn)MnpMgqAlrO1.5(1+r)+p+g-0.5n (I)
wherein 0 # m # 0.4; 0 < n # 0.8; 0.3 5 m+n # 0.9; 0 # p 1.0; 0 # q # 2; and 10 # r # 20.
2. A green light emitting aluminate phosphor according to Claim 1, wherein p = 0.
3. A green light emitting aluminate phosphor according to Claim 2 of the general formula
(Cel-m-nTbmSrn)MgxAl12+yO19+z (III)
wherein 0.4 > m > 0; 0.8 2 n > 0; 2 # x # 0; 8 # y # 0; and 13 > 2z # 0.
4. A green light emitting aluminate phosphor according to Claim 2, which is selected from:
Ce0.55Tb0.30Sr0.15Mg0.85Al12O20.275;
Ce0.55Tb0.30Sr0.15Mg0.85Al14O23.275;
Ce0.40Tb0.30Sr0.30Mg0.70Al12O20.05; and
Ce0.40Tb0.30Sr0.30Mg0.70Al13O21.55.
5. A green light emitting aluminate phosphor according to Claim 1, wherein m = 0.
6. A green light emitting aluminate phosphor according to Claim 5 of the general formula:
(C31-nSrn)MgxMnxAl12+yO19+z (IV)
wherein
0.8 2 n > 0; 1 # v # 0;
1 > x > 0; 8 # y 3 0; and 13 # z # 0.
7. A green light emitting aluminate phosphor according to Claim 6 which is selected from:
Ce0.4Sr0.6Mg0.2Mn0.2Al12O19.6;
Ce0.3Sr0.7Mg0.1Mn0.2Al12O19.35; and
Ce0.2Sr0.8Mn0.2Al12O19.45.
8. A green light emitting aluminate phosphor according to Claim 6 wherein p#0 and m > 0.
9. A green light emitting aluminate phosphor according to Claim 8 of the general formula
(Ce1-m-n TbmSrn)MgvMnxAl12+yO19+z (V)
wherein
0.4 2 m > 0;
0.8 2 n > 0; 1 2 v 2 0; 1 # x > 0; 8 # y # 0; and 13 # z # 0.
10. A green light emitting aluminate phosphor according to Claim 8 or Claim 9, which is selected from:
Ce0.55Tb0.25Sr0.20Mg0.8Mn0.05Al12O20.25;
Ce0.55Tb0.25Sr0.20Mg0.80Mn0.05Al12O20.25; Ce0.45Tb0 25Sr0.30Mg0 55Mn0.05A112019.975; and
Ce0.20Tb0.20Sr0.60Mg0.40Mn0.10Al12O19.70
11. A process for the preparation of a green light emitting aluminate phosphor of the general formula (I) as defined in Claim 1 which comprises the steps of:
(a) mixing one or more oxides or oxide sources containing the
component metals to form an admixture;
(b) firing the admixture in air at 1400 to 1550 0C; (c) pulverizing the fired admixture from step (b); and
(d) subjecting the pulverized admixture from step (c) to firing at 1150 to 1250 0C in a reducing atmosphere.
12. A luminescent coating for a fluorescent lamp which comprises a green light emitting aluminate phosphor as defined in any one of Claims 1 to 10.
13. A luminescent coating according to Claim 12, which further comprises a red light emitting phosphor and/or a blue light emitting phosphor.
14. A luminescent coating according to Claim 13, wherein the red light emitting phosphor is (Y, Eu)2 03.
15. A luminescent coating according to Claim 13 or Claim 14, wherein the ratio of green light emitting aluminate phosphor to red light emitting phosphor is from 40:60 to 20:80.
16. A fluorescent lamp including a lamp envelope having a luminescent coating on the inside surface thereof, said luminescent coating being according to any one of Claims 12 to 15.
17. A fluorescent lamp according to Claim 16 which is a compact fluorescent lamp.
18. Green light emitting aluminate phosphors, processes for their preparation or luminescent coatings containing them, substantially as hereinbefore described with reference to the Examples.
19. The steps, features, compositions and compounds referred to or indicated in the specification and/or claims of this application, individually or collectively, and any and all combinations of any two or more of said steps or features.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91107474.0A CN1028872C (en) | 1991-08-24 | 1991-08-24 | Rare earth aluminate green emission fluorescent body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9214599D0 GB9214599D0 (en) | 1992-08-19 |
| GB2259095A true GB2259095A (en) | 1993-03-03 |
Family
ID=4908812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9214599A Withdrawn GB2259095A (en) | 1991-08-24 | 1992-07-09 | Green light emitting aluminate phosphor |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1028872C (en) |
| AU (1) | AU1478692A (en) |
| GB (1) | GB2259095A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0766285A1 (en) * | 1995-09-29 | 1997-04-02 | Matsushita Electric Industrial Co., Ltd | Method for producing aluminate phosphor |
| EP1028153A1 (en) * | 1999-02-12 | 2000-08-16 | Matsushita Electric Industrial Co., Ltd. | Trivalent rare earth ion-containing aluminate phosphor, a method for producing the same and a light emitting device using the same |
| JP2000297280A (en) * | 1999-02-12 | 2000-10-24 | Matsushita Electric Ind Co Ltd | Trivalent rare earth ion-containing aluminate fluorescent substance, its production and emission device using the fluorescent substance |
| EP1073089A1 (en) * | 1999-07-26 | 2001-01-31 | General Electric Company | Mn2+ activated green emitting SrAl12O19 luminescent material |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4016724B2 (en) * | 2002-05-31 | 2007-12-05 | 住友化学株式会社 | Phosphor for vacuum ultraviolet light-emitting device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1452083A (en) * | 1972-11-03 | 1976-10-06 | Philips Electronic Associated | Luminescent materials |
-
1991
- 1991-08-24 CN CN91107474.0A patent/CN1028872C/en not_active Expired - Fee Related
-
1992
- 1992-04-08 AU AU14786/92A patent/AU1478692A/en not_active Abandoned
- 1992-07-09 GB GB9214599A patent/GB2259095A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1452083A (en) * | 1972-11-03 | 1976-10-06 | Philips Electronic Associated | Luminescent materials |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0766285A1 (en) * | 1995-09-29 | 1997-04-02 | Matsushita Electric Industrial Co., Ltd | Method for producing aluminate phosphor |
| US5879586A (en) * | 1995-09-29 | 1999-03-09 | Matsushita Electric Industrial Co., Ltd. | Method for producing aluminate phosphor |
| EP1028153A1 (en) * | 1999-02-12 | 2000-08-16 | Matsushita Electric Industrial Co., Ltd. | Trivalent rare earth ion-containing aluminate phosphor, a method for producing the same and a light emitting device using the same |
| JP2000297280A (en) * | 1999-02-12 | 2000-10-24 | Matsushita Electric Ind Co Ltd | Trivalent rare earth ion-containing aluminate fluorescent substance, its production and emission device using the fluorescent substance |
| US6290875B1 (en) | 1999-02-12 | 2001-09-18 | Matsushita Electric Industrial Co., Ltd. | Trivalent rare earth ion-containing aluminate phosphor, a method for producing the same and a light emitting device using the same |
| EP1073089A1 (en) * | 1999-07-26 | 2001-01-31 | General Electric Company | Mn2+ activated green emitting SrAl12O19 luminescent material |
| US6210605B1 (en) | 1999-07-26 | 2001-04-03 | General Electric Company | Mn2+ activated green emitting SrAL12O19 luminiscent material |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9214599D0 (en) | 1992-08-19 |
| AU1478692A (en) | 1993-02-25 |
| CN1028872C (en) | 1995-06-14 |
| CN1060103A (en) | 1992-04-08 |
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