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:
Jun. 14, 1988
Filed:
Apr. 08, 1986
Theo J Popma, Enschede, NL;
Hendrik J Joormann, Eindhoven, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
Luminescent aluminoborate and/or aluminosilicate glass which is activated by one or more rare earth metals. The glass has a matrix comprising from 5 to 65 mol. % of one or more of the alkaline earth metal oxides BaO, SrO, CaO, ZnO and MgO, from 20 to 85 mol. % of B.sub.2 O.sub.3 and/or SiO.sub.2 and from 1 to 35 mol. % of Al.sub.2 O.sub.3. The glass contains as activator Tb.sup.3+ and/or Ce.sup.3+ in a quantity, calculated as Tb.sub.2 O.sub.3 and/or Ce.sub.2 O.sub.3, of 0.1 to 10 mol. % with respect to the matrix. The luminescent glasses have high conversion efficiencies, especially high quantum efficiencies upon UV excitation, and are preferably used in luminescent screens of, for example, discharge lamps or cathode-ray tubes.