Title:
CERIUM AND/OR TERBIUM PHOSPHATE, OPTIONALLY WITH LANTHANUM, PHOSPHOR RESULTING FROM SAID PHOSPHATE, AND METHODS FOR MAKING SAME
Document Type and Number:
WIPO Patent Application WO/2010/057923
Kind Code:
A3
Abstract:
The invention relates to a rare earth element phosphate (Ln), where Ln is either at least one rare earth element selected from cerium and terbium, or lanthanum in combination with at least one of the above two rare earth elements, having a crystalline structure either of the rhabdophane type with a sodium content of 6000 ppm at most, or of the monazite type with a sodium content of 4000 ppm at most. The phosphate is obtained by the precipitation of a rare earth element chloride at a constant pH lower than 2, and then calcining and redispersing the same in hot water. The invention also relates to a phosphor obtained by calcining the phosphate at at least 1000°C.
Inventors:
BUISSETTE VALERIE (FR)
LE-MERCIER THIERRY (FR)
LE-MERCIER THIERRY (FR)
Application Number:
PCT/EP2009/065395
Publication Date:
July 15, 2010
Filing Date:
November 18, 2009
Export Citation:
Assignee:
RHODIA OPERATIONS (FR)
BUISSETTE VALERIE (FR)
LE-MERCIER THIERRY (FR)
BUISSETTE VALERIE (FR)
LE-MERCIER THIERRY (FR)
International Classes:
C09K11/81; C01B25/45; C09K11/77
Foreign References:
| US3634282A | 1972-01-11 | |||
| GB2124243A | 1984-02-15 |
Other References:
KARPOVICH L ET AL: "Synthesis and characterization of mixed-morphology CePO4 nanoparticles", JOURNAL OF SOLID STATE CHEMISTRY, ORLANDO, FL, US, vol. 180, 1 January 2007 (2007-01-01), pages 840 - 846, XP002508183, ISSN: 0022-4596
PARENT C ET AL: "Proprietes optiques de la phase Na3La1-x-yCexTby(PO4)2", SOLID STATE COMMUNICATIONS, OXFORD, vol. 35, no. 6, 1 August 1980 (1980-08-01), pages 451 - 455, XP024512254, ISSN: 0038-1098, [retrieved on 19800801]
BOCHU P ET AL: "The Ce<3+> -> Tb<3+> transfer in phosphate host lattices", MATERIALS RESEARCH BULLETIN, ELSEVIER, KIDLINGTON, GB, vol. 16, no. 7, 1 July 1981 (1981-07-01), pages 883 - 886, XP024079460, ISSN: 0025-5408, [retrieved on 19810701]
ZHU ET AL: "Crystal and band structures, and optical characterizations of sodium rare earth phosphates NaLnP2O7 and NaLn(PO3)4 (Ln=Ce, Eu)", JOURNAL OF ALLOYS AND COMPOUNDS, ELSEVIER SEQUOIA, LAUSANNE, CH, vol. 454, no. 1-2, 18 March 2008 (2008-03-18), pages 419 - 426, XP022540600, ISSN: 0925-8388
SZCZYGIEL I ET AL: "Phase equilibria in the partial system CePO4-Na4P2O7-NaPO3", MATERIALS CHEMISTRY AND PHYSICS, ELSEVIER, vol. 31, no. 3, 1 May 1992 (1992-05-01), pages 277 - 279, XP024149332, ISSN: 0254-0584, [retrieved on 19920501]
SZCZYGIEL I ET AL: "Phase diagram for a portion of the system Ce2O3@?Na2O@?P2O5 rich in P2O5", JOURNAL OF SOLID STATE CHEMISTRY, ORLANDO, FL, US, vol. 82, no. 2, 1 October 1989 (1989-10-01), pages 181 - 185, XP024195121, ISSN: 0022-4596, [retrieved on 19891001]
PARENT C ET AL: "Proprietes optiques de la phase Na3La1-x-yCexTby(PO4)2", SOLID STATE COMMUNICATIONS, OXFORD, vol. 35, no. 6, 1 August 1980 (1980-08-01), pages 451 - 455, XP024512254, ISSN: 0038-1098, [retrieved on 19800801]
BOCHU P ET AL: "The Ce<3+> -> Tb<3+> transfer in phosphate host lattices", MATERIALS RESEARCH BULLETIN, ELSEVIER, KIDLINGTON, GB, vol. 16, no. 7, 1 July 1981 (1981-07-01), pages 883 - 886, XP024079460, ISSN: 0025-5408, [retrieved on 19810701]
ZHU ET AL: "Crystal and band structures, and optical characterizations of sodium rare earth phosphates NaLnP2O7 and NaLn(PO3)4 (Ln=Ce, Eu)", JOURNAL OF ALLOYS AND COMPOUNDS, ELSEVIER SEQUOIA, LAUSANNE, CH, vol. 454, no. 1-2, 18 March 2008 (2008-03-18), pages 419 - 426, XP022540600, ISSN: 0925-8388
SZCZYGIEL I ET AL: "Phase equilibria in the partial system CePO4-Na4P2O7-NaPO3", MATERIALS CHEMISTRY AND PHYSICS, ELSEVIER, vol. 31, no. 3, 1 May 1992 (1992-05-01), pages 277 - 279, XP024149332, ISSN: 0254-0584, [retrieved on 19920501]
SZCZYGIEL I ET AL: "Phase diagram for a portion of the system Ce2O3@?Na2O@?P2O5 rich in P2O5", JOURNAL OF SOLID STATE CHEMISTRY, ORLANDO, FL, US, vol. 82, no. 2, 1 October 1989 (1989-10-01), pages 181 - 185, XP024195121, ISSN: 0022-4596, [retrieved on 19891001]
Attorney, Agent or Firm:
DUBRUC, Philippe et al. (Direction de la Propriété Industrielle40 rue de la Haie-Coq, F-Aubervilliers, FR)
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