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Title: Methods for preparation of nanocrystalline rare earth phosphates for lighting applications

Abstract

Disclosed here are methods for the preparation of optionally activated nanocrystalline rare earth phosphates. The optionally activated nanocrystalline rare earth phosphates may be used as one or more of quantum-splitting phosphor, visible-light emitting phosphor, vacuum-UV absorbing phosphor, and UV-emitting phosphor. Also disclosed herein are discharge lamps comprising the optionally activated nanocrystalline rare earth phosphates provided by these methods.

Inventors:
; ; ; ;
Publication Date:
Research Org.:
NETL (National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV (United States))
Sponsoring Org.:
USDOE
OSTI Identifier:
1083772
Patent Number(s):
8,419,974
Application Number:
12/332,881
Assignee:
General Electric Company (Schenectady, NY) NETL
DOE Contract Number:
FC26-03NT41945
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Comanzo, Holly Ann, Manoharan, Mohan, Martins Loureiro, Sergio Paulo, Setlur, Anant Achyut, and Srivastava, Alok Mani. Methods for preparation of nanocrystalline rare earth phosphates for lighting applications. United States: N. p., 2013. Web.
Comanzo, Holly Ann, Manoharan, Mohan, Martins Loureiro, Sergio Paulo, Setlur, Anant Achyut, & Srivastava, Alok Mani. Methods for preparation of nanocrystalline rare earth phosphates for lighting applications. United States.
Comanzo, Holly Ann, Manoharan, Mohan, Martins Loureiro, Sergio Paulo, Setlur, Anant Achyut, and Srivastava, Alok Mani. Tue . "Methods for preparation of nanocrystalline rare earth phosphates for lighting applications". United States. doi:. https://www.osti.gov/servlets/purl/1083772.
@article{osti_1083772,
title = {Methods for preparation of nanocrystalline rare earth phosphates for lighting applications},
author = {Comanzo, Holly Ann and Manoharan, Mohan and Martins Loureiro, Sergio Paulo and Setlur, Anant Achyut and Srivastava, Alok Mani},
abstractNote = {Disclosed here are methods for the preparation of optionally activated nanocrystalline rare earth phosphates. The optionally activated nanocrystalline rare earth phosphates may be used as one or more of quantum-splitting phosphor, visible-light emitting phosphor, vacuum-UV absorbing phosphor, and UV-emitting phosphor. Also disclosed herein are discharge lamps comprising the optionally activated nanocrystalline rare earth phosphates provided by these methods.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 16 00:00:00 EDT 2013},
month = {Tue Apr 16 00:00:00 EDT 2013}
}

Patent:

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  • Some embodiments of the present invention are directed toward nanocrystalline oxide-based phosphor materials, and methods for making same. Typically, such methods comprise a steric entrapment route for converting precursors into such phosphor material. In some embodiments, the nanocrystalline oxide-based phosphor materials are quantum splitting phosphors. In some or other embodiments, such nanocrystalline oxide based phosphor materials provide reduced scattering, leading to greater efficiency, when used in lighting applications.
  • A method is given for preparing the hydrogen phosphates of Ca, Sr, Ba, Mg, Cd, and Mn with a uniform crystallinity for use in the manufacture of luminescent materials. The method comprises preparing a solution containing alkaline earth metal ions and phosphate ions at a pH low enough to prevent precipitation, adding urea or some other hydrolyzable amide to the solution, and heating the solution to hydrolyze the urea or amide andd thus effect the homogeneous precipitation of the phosphate. In the case of calcium hydrogen phosphate, the precipitate recovered from a boiling solution is in the anhydrous form, especiallymore » suitable for phosphor production, while other precipitation methods yield only hydrated salts. (D.L.C.)« less
  • A method is described for the separation of a radioactive rare earth metal isotope or a radioactive isotope of yttrium or scandium from its alkaline earth metal precursor comprising contacting a sample containing at least one of said isotopes and said precursor with an ionizable dibenzo ether derivative.
  • A sintered rare earth-iron Laves phase magnetostrictive alloy product characterized by a grain oriented morphology. The grain oriented morphology is obtained by magnetically aligning powder particles of the magnetostrictive alloy prior to sintering. Specifically disclosed are grain oriented sintered compacts of Tb.sub.x Dy.sub.1-x Fe.sub.2 and their method of preparation. The present sintered products have enhanced magnetostrictive properties.