US Patent Issued to LUMILEDS on Nov. 3 for "Polychromic LED stack" (California Inventors)

ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,787,887, issued on Nov. 3, was assigned to LUMILEDS LLC (San Jose, Calif.).

"Polychromic LED stack" was invented by Zhongmin Ren (Danville, Calif.), Robert Armitage (Cupertino, Calif.), Brendan Jude Moran (San Jose, Calif.), Hee Jin Kim (Fremont, Calif.) and Rajiv Pathak (Milpitas, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Three sets of LED layers each include p-doped and n-doped layers with an active layer therebetween, a tunnel junction layer against the p-doped layer, and an additional n-doped layer against the tunnel junction layer. The first and second LED layer sets are separated by a first semi-insulating semiconductor layer; the secon...