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:
Oct. 30, 2012
Filed:
Jan. 12, 2007
Chen-wen Fan, Sayre, PA (US);
Tuan A. Dang, Sayre, PA (US);
Joan M. Coveleskie, Sayre, PA (US);
Frank A. Schwab, Towanda, PA (US);
Dale E. Benjamin, Athens, PA (US);
David C. Sheppeck, Sayre, PA (US);
Chen-Wen Fan, Sayre, PA (US);
Tuan A. Dang, Sayre, PA (US);
Joan M. Coveleskie, Sayre, PA (US);
Frank A. Schwab, Towanda, PA (US);
Dale E. Benjamin, Athens, PA (US);
David C. Sheppeck, Sayre, PA (US);
Global Tungsten & Powders Corp., Towanda, PA (US);
Abstract
An electroluminescent (EL) phosphor is described wherein each individual phosphor particle is encapsulated in an inorganic coating, preferably aluminum oxyhydroxide. The encapsulated phosphor shows an extreme insensitivity to atmospheric moisture and suffers only minor loss of initial brightness in lamps. The method of applying the coating is a hybrid process, which involves EL phosphor particles first being coated with a thin inorganic film using an atomic layer deposition (ALD) method in a fluidized bed wherein the precursors are introduced sequentially in repeated cycles, subsequently followed by an additional coating layer applied by a chemical vapor deposition (CVD) method in which the precursors are introduced simultaneously.