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:
Feb. 09, 1999
Filed:
May. 22, 1997
Mai Pham Thi, Fresnes, FR;
Adele Le Fur, Gif S/Yvette, FR;
Thomson-CSF, Paris, FR;
Abstract
The disclosure relates to a family of luminophors Ba.sub.z -Al.sub.12-x Mn.sub.x O.sub.19 with 0.8.ltoreq.z.ltoreq.1.3, wherein x ranges from 0.2 to 0.7 and has a time of decay, to 10% of the light energy emitted, of less than about 15 ms. It also relates to a method for the manufacture of this family of luminophors having a time of decay, to about 10% of the initial light intensity emitted, of less than about 15 ms. It also relate to a method for the manufacture of this family of luminophors, using a primary vacuum step in order to obtain a neutral or reductive atmosphere with an oxygen content of less than about 10 particles per million (ppm). This method has the great value of enabling the formation of barium hexa-aluminate with a high manganese content to lower the decay time while, at the same time, preserving high luminous efficiency. Application to high-definition television.