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:
Apr. 24, 2012
Filed:
Aug. 05, 2009
Chi-wei LU, Taoyuan County, TW;
Meng-lun Tsai, Taoyuan County, TW;
Chi-Wei Lu, Taoyuan County, TW;
Meng-Lun Tsai, Taoyuan County, TW;
Epistar Corporation, Hsinchu, TW;
Abstract
A light-emitting device with a tunneling structure and a current spreading layer is disclosed. It includes an electrically conductive permanent substrate, an adhesive layer, an epitaxial structure, a tunneling structure and a current spreading layer. The adhesive layer is on the electrically conductive permanent substrate. The epitaxial structure on the adhesive layer at least comprises an upper cladding layer, an active layer, and a lower cladding layer. The tunneling structure on the epitaxial structure comprises a first conductivity type semiconductor layer with a first doping concentration and a second conductivity type semiconductor layer with a second doping concentration. The current spreading layer is on the tunneling structure.