Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Reexamination Certificate
2005-03-22
2005-03-22
Koslow, C. Melissa (Department: 1755)
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
Reexamination Certificate
active
06869544
ABSTRACT:
The present invention pertains to a process for synthesizing nano-scale yttrium aluminum garnet (YAG) fluorescent powders having formula (I):in-line-formulae description="In-line Formulae" end="lead"?(Y3−xR1x)(Al5−yR2y)O12 (I)in-line-formulae description="In-line Formulae" end="tail"?wherein R1and R2are independently selected from the elements consisting of rare earth metals and transition metals, and each of x and y is independently a value between 0 and 1.5, where the process comprises the steps:(a) forming an aqueous solution comprising rare earth metal ions, transition metal ions, yttrium ion and aluminum ion;(b) adding a precipitating agent to the aqueous solution of step (a) in an amount sufficient to allow the rare earth metal ions, transition metal ions, yttrium ion and aluminum ion comprised in the aqueous solution to substantially complex with the depositing agent;(c) drying the gel of step (b) to obtain a dried gel;(d) adding a dehydroxying compound to the dried gel of step (c) and subjecting it to a further drying step; and(e) sintering the product of step (d) at a temperature between 700 and 1400° C. to obtain the nano-scale yttrium aluminum garnet fluorescent powders of formula (I).
REFERENCES:
patent: 412585 (2000-11-01), None
Manabu Gomi & Tomohiko Kanie; Ce3+, Fe3+Induced Optical Absorption in Ce, Fe: YAG Prepared by Coprecipitation; Jpn. J. Appl. Phys. vol. 35 (1996) pp. 1798-1801.
Chen, Yu Lin Synthesis and Characterization of Garnet (Y3A 15012) Phosphors Published Abstract (2001) pp. 1-6.
Nae-Lih Wu, Sze-Yen Wang. I.A. Rusakova “Inhibition of Crystallite Growth in the Sol-Gel Synthesis of Nanocrystalline Metal Oxides” Science vol. 285 Aug. 27, 1999 pp. 1375-1377.
Chen In-Gann
Chen Yu-Lin
Hwang Chii-Shyang
Koslow C. Melissa
Ladas & Parry
National Cheng Kung University
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