JPS5569687A - Luminous substance and its preparation - Google Patents
Luminous substance and its preparationInfo
- Publication number
- JPS5569687A JPS5569687A JP14282378A JP14282378A JPS5569687A JP S5569687 A JPS5569687 A JP S5569687A JP 14282378 A JP14282378 A JP 14282378A JP 14282378 A JP14282378 A JP 14282378A JP S5569687 A JPS5569687 A JP S5569687A
- Authority
- JP
- Japan
- Prior art keywords
- reducing atmosphere
- calcined
- pulverized
- ceo
- calcining
- 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.)
- Pending
Links
- 239000000126 substance Substances 0.000 title abstract 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 4
- -1 Tb4O7 Chemical compound 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 3
- 238000001354 calcination Methods 0.000 abstract 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 abstract 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 239000012535 impurity Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052684 Cerium Inorganic materials 0.000 abstract 1
- 229910052688 Gadolinium Inorganic materials 0.000 abstract 1
- 229910052771 Terbium Inorganic materials 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 229910052746 lanthanum Inorganic materials 0.000 abstract 1
- 229910052761 rare earth metal Inorganic materials 0.000 abstract 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 229910052727 yttrium Inorganic materials 0.000 abstract 1
Landscapes
- Luminescent Compositions (AREA)
Abstract
PURPOSE: To reduce the impurity content, e.g. KF, and to improve the brightness of the fluorescent substance, by calcining a mixture of Ln2O3, CeO2, Tb4O7, SiO2, and KF, in a reducing atmosphere, and by calcining the pulverized and rinsed material in a reducing atmosphere.
CONSTITUTION: A mixture of Ln2O3, CeO2, Tb4O7, SiO2, and KF, is calcined in a reducing atmosphere, e.g. an atmosphere having a carbon layer thereon. The calcined material is then finely pulverized and rinsed with pure water thoroughly to remove the impurities consisting mainly of KF, etc. The pulverized material is then dried and calcined in a reducing atmosphere, e.g. H2+N2, to form a fluorescent substance comprising a rare earth silicate activated with cerium and terbium (Ln is Y, La, Gd, or Lu; 1×10-3≤x≤3×10-1; 3×10-2≤y≤3×10-1; 0.8≤z≤ 2.2), and 1000ppm or less of residual KF from the flux.
USE: Lighting fluorescent lamps emitting green by ultraviolet irradiation.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14282378A JPS5569687A (en) | 1978-11-21 | 1978-11-21 | Luminous substance and its preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14282378A JPS5569687A (en) | 1978-11-21 | 1978-11-21 | Luminous substance and its preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5569687A true JPS5569687A (en) | 1980-05-26 |
Family
ID=15324447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14282378A Pending JPS5569687A (en) | 1978-11-21 | 1978-11-21 | Luminous substance and its preparation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5569687A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56143286A (en) * | 1980-04-11 | 1981-11-07 | Mitsubishi Electric Corp | Preparation of terbium-activated lanthanum yttrium silicate phosphor |
| JPS62104893A (en) * | 1985-10-31 | 1987-05-15 | Sony Corp | Production of small particle of fluorescent substance |
| US5540947A (en) * | 1993-11-25 | 1996-07-30 | Minnesota Mining And Manufacturing Company | X-ray intensifying screens and method of manufacturing the same |
-
1978
- 1978-11-21 JP JP14282378A patent/JPS5569687A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56143286A (en) * | 1980-04-11 | 1981-11-07 | Mitsubishi Electric Corp | Preparation of terbium-activated lanthanum yttrium silicate phosphor |
| JPS62104893A (en) * | 1985-10-31 | 1987-05-15 | Sony Corp | Production of small particle of fluorescent substance |
| US5540947A (en) * | 1993-11-25 | 1996-07-30 | Minnesota Mining And Manufacturing Company | X-ray intensifying screens and method of manufacturing the same |
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