US5055226A
Expired / Lapsed
US
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Manufacturing method for red phosphor
Assignee: Samsung SDI Co Ltd
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Filing: 1989-12-15
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Granted: 1991-10-08
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Expires: 2009-12-15
Abstract
Abstract A manufacturing method for a Y 2 O 3 : Eu red phosphor is disclosed in which yttrium oxide and europium oxide are used, and also a composite flux composed of a mixture of Na 2 CO 3 , NaF and B 2 O 3 is used. The Y 2 O 3 : Eu red phosphor according to the present invention is uniform in its particle size distribution, has a desirable spherical particle shape, shows a perfect filling state of the layer, and shows a luminance improvement by 4-7% over that of the conventional phosphor.
Inventors
- 👤 Junmo Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:37
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A method for manufacturing a Y 2 O 3 : Eu red phosphor from yttrium oxide (Y 2 O 3 ) and europium oxide (Eu 2 O 3 ) comprising the step of baking at a temperature of about 1300° to 1400° C. the yttrium oxides and europium oxides in a flux consisting essentially of a mixture of from 2 to 6 parts by weight of Na 2 CO 3 , from 2 to 6 parts by weight of NaF and from 0.5 to 1.0 parts by weight of B 2 O 3 per 100 parts by weight of yttrium oxide.
Claim 2
Independent Claim
101 words
A method for manufacturing a Y 2 O 3 : Eu red phosphor from yttrium oxide (Y 2 O 3 ) and europium oxide (Eu 2 O 3 ) comprising the step of baking at a temperature of about 1300° to 1400° C. the yttrium oxides and europium oxides in a flux consisting essentially of a mixture of from 2 to 6 parts by weight of Na 2 CO 3 , from 2 to 6 parts by weight of NaF and from 0.5 to 1.0 parts by weight of B 2 O 3 per 100 parts by weight of yttrium oxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |