Rare earth-activated aluminum nitride powders and method of making
Abstract
Rare earth-activated aluminum nitride powders are made using a solution-based approach to form a mixed hydroxide of aluminum and a rare earth metal, the mixed hydroxide is then converted into an ammonium metal fluoride, preferably a rare earth-substituted ammonium aluminum hexafluoride ((NH4)3Al1-xRExF6), and finally the rare earth-activated aluminum nitride is formed by ammonolysis of the ammonium metal fluoride at a high temperature. The use of a fluoride precursor in this process avoids sources of oxygen during the final ammonolysis step which is a major source of defects in the powder synthesis of nitrides. Also, because the aluminum nitride is formed from a mixed hydroxide co-precipitate, the distribution of the dopants in the powder is substantially homogeneous in each particle.
- Inventors:
- Issue Date:
- Research Org.:
- Osram Sylvania Inc., Danvers, MA (United States); Univ. of California, La Jolla, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1531680
- Patent Number(s):
- 7935325
- Application Number:
- 12/161,017
- Assignee:
- Osram Sylvania Inc. (Danvers, MA); The Regents of the University of California (La Jolla, CA)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- DOE Contract Number:
- FC26-04NT42274
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2006-12-20
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Han, Bing, Tao, Jonathan H., Raukas, Madis, Klinedinst, Keith A., Talbot, Jan B., and Mishra, Kailash A.. Rare earth-activated aluminum nitride powders and method of making. United States: N. p., 2011.
Web.
Han, Bing, Tao, Jonathan H., Raukas, Madis, Klinedinst, Keith A., Talbot, Jan B., & Mishra, Kailash A.. Rare earth-activated aluminum nitride powders and method of making. United States.
Han, Bing, Tao, Jonathan H., Raukas, Madis, Klinedinst, Keith A., Talbot, Jan B., and Mishra, Kailash A.. Tue .
"Rare earth-activated aluminum nitride powders and method of making". United States. https://www.osti.gov/servlets/purl/1531680.
@article{osti_1531680,
title = {Rare earth-activated aluminum nitride powders and method of making},
author = {Han, Bing and Tao, Jonathan H. and Raukas, Madis and Klinedinst, Keith A. and Talbot, Jan B. and Mishra, Kailash A.},
abstractNote = {Rare earth-activated aluminum nitride powders are made using a solution-based approach to form a mixed hydroxide of aluminum and a rare earth metal, the mixed hydroxide is then converted into an ammonium metal fluoride, preferably a rare earth-substituted ammonium aluminum hexafluoride ((NH4)3Al1-xRExF6), and finally the rare earth-activated aluminum nitride is formed by ammonolysis of the ammonium metal fluoride at a high temperature. The use of a fluoride precursor in this process avoids sources of oxygen during the final ammonolysis step which is a major source of defects in the powder synthesis of nitrides. Also, because the aluminum nitride is formed from a mixed hydroxide co-precipitate, the distribution of the dopants in the powder is substantially homogeneous in each particle.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {5}
}
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Works referencing / citing this record:
Fluorescent lighting with aluminum nitride phosphors
patent, May 2016
- Cherepy, Nerine; Payne, Stephen A.; Seeley, Zachary M.
- US Patent Document 9,337,010