JPS55161883A - Production of phosphor - Google Patents
Production of phosphorInfo
- Publication number
- JPS55161883A JPS55161883A JP6965379A JP6965379A JPS55161883A JP S55161883 A JPS55161883 A JP S55161883A JP 6965379 A JP6965379 A JP 6965379A JP 6965379 A JP6965379 A JP 6965379A JP S55161883 A JPS55161883 A JP S55161883A
- Authority
- JP
- Japan
- Prior art keywords
- europium
- yttrium
- phosphor
- earth metal
- alkaline earth
- 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.)
- Granted
Links
Abstract
PURPOSE: To produce a phosphor having an increased particle diameter and improved fluorescent brightness, by decomposing, by heating, a coprecipitated compound of oxalates of yttrium and europium, adding an alkaline earth metal borate to the resulting mixture and firing the mixture.
CONSTITUTION: A europium-activated yttrium oxide phosphor is produced by adding 0.5W15% of an alkaline earth metal borate compound to an yttrium europium compound prepared by heat-decomposing at a relatively low temperature, a precipitate obtained by mixing an acidic aqueous solution of yttrium and europium with an aqueous solution of oxalic acid, and firing the resulting product in an oxidizing atmosphere. The use of below 0.5wt% of the alkaline earth metal borate compound has little effect on increasing the particle diameter of the yttrium europium oxide phosphor. And the use of more than 14wt% lowers fluorescent brightness and so, the product is not suitable as a phosphor used in high efficiency fluorescent lamps.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6965379A JPS55161883A (en) | 1979-06-04 | 1979-06-04 | Production of phosphor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6965379A JPS55161883A (en) | 1979-06-04 | 1979-06-04 | Production of phosphor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55161883A true JPS55161883A (en) | 1980-12-16 |
JPS618865B2 JPS618865B2 (en) | 1986-03-18 |
Family
ID=13409004
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6965379A Granted JPS55161883A (en) | 1979-06-04 | 1979-06-04 | Production of phosphor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55161883A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5945384A (en) * | 1982-09-08 | 1984-03-14 | Toshiba Corp | Preparation of yttrium oxide fluorescent substance activated with europium |
US5576114A (en) * | 1993-02-04 | 1996-11-19 | Kabushiki Kaisha Toshiba | High density magnetic recording medium containing hexagonal system ferrite powder |
US5585692A (en) * | 1993-02-26 | 1996-12-17 | Kabushiki Kaisha Toshiba | Fluorescent material and fluorescent lamp using same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52104484A (en) * | 1975-12-29 | 1977-09-01 | Dainippon Toryo Co Ltd | Production of fluorescent substance comprising oxides of rare earth el ements |
-
1979
- 1979-06-04 JP JP6965379A patent/JPS55161883A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52104484A (en) * | 1975-12-29 | 1977-09-01 | Dainippon Toryo Co Ltd | Production of fluorescent substance comprising oxides of rare earth el ements |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5945384A (en) * | 1982-09-08 | 1984-03-14 | Toshiba Corp | Preparation of yttrium oxide fluorescent substance activated with europium |
JPH0132873B2 (en) * | 1982-09-08 | 1989-07-10 | Tokyo Shibaura Electric Co | |
US5576114A (en) * | 1993-02-04 | 1996-11-19 | Kabushiki Kaisha Toshiba | High density magnetic recording medium containing hexagonal system ferrite powder |
US5766763A (en) * | 1993-02-04 | 1998-06-16 | Kabushiki Kaisha Toshiba | Hexagonal system ferrite powder for a high density magnetic recording medium |
US5585692A (en) * | 1993-02-26 | 1996-12-17 | Kabushiki Kaisha Toshiba | Fluorescent material and fluorescent lamp using same |
Also Published As
Publication number | Publication date |
---|---|
JPS618865B2 (en) | 1986-03-18 |
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