Patent ID: 8018029

Claim:
A gallium nitride-based epitaxial wafer for a nitride light-emitting device, comprising: a gallium nitride substrate having a primary surface; at least one gallium nitride-based semiconductor film provided on the primary surface of the gallium nitride substrate; and, an active layer provided on the gallium nitride-based semiconductor film, the active layer having a quantum well structure; the active layer including a well layer of a gallium nitride-based semiconductor, the gallium nitride-based semiconductor containing indium as a Group III element, a normal line of the primary surface and a C-axis of the gallium nitride substrate forming an off angle with each other, the off angle being distributed on the primary surface, the off angle monotonically increasing on a line, the line extending from one point to another point through a center point of the primary surface of the gallium nitride substrate, the one point and the another point being on an edge of the primary surface, indium contents of the well layer defined at n points (n: integer) on the line monotonically decreasing in a direction from the one point to the another point, and the thickness values of the well layer defined at the n points monotonically increasing in the direction.