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:
Aug. 06, 2013
Filed:
Jan. 31, 2012
Chung Hoon Lee, Ansan-si, KR;
Walter Tews, Griefswald, DE;
Gundula Roth, Levenhagen, DE;
Stefan Tews, Griefswald, DE;
Chung Hoon Lee, Ansan-si, KR;
Walter Tews, Griefswald, DE;
Gundula Roth, Levenhagen, DE;
Stefan Tews, Griefswald, DE;
Seoul Semiconductor Co., Ltd., Seoul, KR;
Abstract
Disclosed are non-stoichiometric Copper Alkaline Earth Silicate phosp hors activated by divalent europium for using them as high temperature stable luminescent mat erials for ultraviolet or daylight excitation. The phosphors are represented as the formula (BaSrCaCu)(Zn,Mg,Mn)SiO:Eu. The non-stoichiometric tetragonal silicat e is prepared in a high temperature solid state reaction with a surplus of silica in the starting mixture. Furthermore, luminescent tetragonal Copper Alkaline Earth Silicates are provided for LED applications, which have a high color temperature range from about 2,000K to 8,000K or 10,000 K showing a CRI with Ra=80˜95, when mixed with other luminescent materials.