The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 05, 2013
Filed:
Jun. 20, 2006
Joung Kyu Park, Daejeon, KR;
Chang Hae Kim, Daejeon, KR;
Kyoung Jae Choi, Chungcheongnam-do, KR;
Kyung Nam Kim, Daejeon, KR;
Jae Myung Kim, Chungcheongnam-do, KR;
Joung Kyu Park, Daejeon, KR;
Chang Hae Kim, Daejeon, KR;
Kyoung Jae Choi, Chungcheongnam-do, KR;
Kyung Nam Kim, Daejeon, KR;
Jae Myung Kim, Chungcheongnam-do, KR;
Korea Research Institute of Chemical Technology, Daejeon, KR;
Abstract
The present invention relates to a phosphor for UV and long-wavelength excitation and a preparation method thereof, more particularly to a phosphor for UV and long-wavelength excitation prepared from a phosphor precursor comprising strontium, barium, zinc, silica and rare-earth metal, wherein the proportion of barium and zinc is optimized to obtain a color coordinate in the range of x=0.50-0.64 and y=0.38-0.51, and a method for preparing the same by heat-treating the phosphor precursor under a mixed gas atmosphere of nitrogen and hydrogen with specific proportion. Since heat treatment is possible even at low temperature, a phosphor for UV and long-wavelength excitation having superior luminescence characteristics and thus offering superior efficiency when applied to diodes or liquid crystal displays can be obtained without having to use conventional flux materials to lower baking temperature and without using toxic substances.