Patent ID: 6956241

Claim:
A semiconductor light emitting element comprising: a light emitting layer for emitting light of a wavelength λ by current injection; and a GaP substrate transparent to light of the wavelength λ, the GaP substrate being an off-axis (100) GaP substrate with an off-axis angle of θ (5°≦θ≦20°) along the direction, and having: a first surface on which the light emitting layer is formed; a second surface opposed to the first surface and having an area smaller than the first surface; and first to fourth side surfaces, the first and the third side surfaces being opposed to each other, the second and the fourth side surfaces being opposed to each other, the first side surface being (1-11) oriented, the second side surface being slanted from a (111) orientation, the third side surface being (11-1) oriented, the fourth side surface being slanted from a (1-1-1) orientation, the first to fourth side surfaces individually being aslant to become narrower toward the second surface and permitting part of light from the light emitting layer to be extracted externally therethrough, the first to fourth side surfaces having a plurality of depressions and protrusions along outer surfaces thereof, wherein the depressions and protrusions have a height in a range from a lower limit equal to or higher than 0.1 λ to an upper limit equal to or lower than 3 λ.