LED element and method of manufacturing the same

An LED element comprising:

• a semiconductor lamination part that includes a light-emitting layer;
• a diffractive surface on which light emitted from the light-emitting layer is incident and on which projection parts are formed with a period larger than an optical wavelength of the light and smaller than a coherence length of the light and which reflects the incident light in a plurality of modes according to a Bragg diffraction condition and transmits the incident light in a plurality of modes according to the Bragg diffraction condition;
• and
• a reflecting surface that reflects light refracted by the diffractive surface so that the reflected light is incident on the diffractive surface again, wherein
• the semiconductor lamination part is formed on the diffractive surface without any void around the projection parts,
• a proportion of a flat part in the diffractive surface is 40% or more in a plan view thereof,
• the light-emitting layer emits blue light,
• the projection parts are disposed at the intersections of virtual triangular or rectangular lattices in a plan view thereof, and
• the triangles or rectangles that form the virtual triangular or rectangular lattice do not have a regular polygonal shape and the length of each side is larger than twice the optical wavelength of the blue light and smaller than the coherence length.