Patent ID: 7893447

Claim:
A nitride-based semiconductor LED comprising: a substrate that is formed in a rectangle shape and of which a ratio of the width and the length is equal to or more than 1.5; an n-type nitride semiconductor layer that is formed on the substrate and is composed of an n-type semiconductor material having a compositional formula of In X Al Y Ga 1-X-Y N (0≦X, 0≦Y, and X+Y≦1); an active layer and a p-type nitride semiconductor layer that are sequentially formed on a predetermined region of the n-type nitride semiconductor layer, the active layer being composed of a semiconductor material having a compositional formula of In X Al Y Ga 1-X-Y N (0≦X, 0≦Y, and X+Y≦1) and the p-type nitride semiconductor layer being composed of a p-type semiconductor material having a compositional formula of In X Al Y Ga 1-X-Y N (0≦X, 0≦Y, and X+Y≦1); a transparent electrode that is formed on the p-type nitride semiconductor layer; a p-electrode pad that is formed on the transparent electrode; an n-electrode pad that is formed on the n-type nitride semiconductor layer; and a buffer layer that is formed between the substrate and the n-type nitride semiconductor layer, wherein the p-electrode pad, devoid of any elongated protrusion or any auxiliary electrode, is spaced at a distance of 50 to 200 μm from an outer edge line of the p-type nitride semiconductor layer such that a uniform luminous effect is obtained in the entire LED, and wherein the center of the outer edge line of the p-type nitride semiconductor layer intersects with a straight line that connects a center of the p-electrode pad and a center of the n-electrode pad, and, whereby when the p-electrode pad is spaced at a distance in some range of 50 to 200 μm from the outer edge line of the p-type nitride semiconductor layer, optical power increases, and when the p-electrode pad is spaced at a distance in some range of more than 200 μm from the outer edge line of the p-type nitride semiconductor layer, optical power decreases.