Patent ID: 8928012
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. The light emitting device for use with an alternating current (AC) power source comprising: a transparent sapphire substrate; a plurality of LED cells monolithically formed on the said sapphire substrate; the LED cell has: (i) an undoped GaN seed layer on top of said sapphire substrate; (ii) a silicon doped n-type GaN layer above said GaN seed layer to act as an n-type semiconductor layer and to form an n-type electrode; (iii) a super lattice layer comprising layers of In wherein the plurality of LED cells are formed into five groups of LED cells formed on the said sapphire substrate; within said each group of LED cells, the p-electrode of the LED cell is connected to the n-electrode of its adjacent cell; the p-electrode of the first LED cell of said the first group is connected to a positive electrode of the AC power source and also the n-electrode of the last LED cell of said the fourth group; the n-electrode of the last LED cell of said the first group is connected to the p-electrode of the first LED cell of said the fifth group and to the n-electrode of the last LED cell of said the third group; the n-electrode of the last LED cell of said the fifth group is connected to the p-electrode of the first cell of said the fourth group and to the p-electrode of the first LED cell of said the second group; the n-electrode of the last LED cell of said the second group is connected to a negative electrode of the AC power source and also to the p-electrode of the first cell of said the third group; and the interconnection between cells is by a deposited and patterned metal film that occupies a common plane above the LED cells.