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:
Jan. 04, 2011
Filed:
Apr. 29, 2008
Kailash C. Mishra, North Chelmsford, MA (US);
Kailash C. Mishra, North Chelmsford, MA (US);
OSRAM SYLVANIA Inc., Danvers, MA (US);
Abstract
A light emitting diode (LED) includes a p-n junction containing luminescent activator ions. The visible emission from the activator ions preferably complementing the band edge emission of the LED in order to produce an overall white emission from the LED. In a preferred embodiment, the LED has double heterojunction structure having a semiconductor active layer between two confinement layers. The semiconductor active layer includes activator ions preferably selected from among Eu, Tb, Dy, Pr, Tm, and Mn. The electron-hole pairs trapped within the active layer sensitize the activator ions, causing the activator ions to emit light.