Patent ID: 7683378

Claim:
A light emitting diode, comprising: a first conductivity type substrate; a first conductivity type distributed Bragg reflector comprising a multi-layered film which is made by alternately layering a high refractive index film comprising an AlGaAs layer comprising Al x Ga l-x As wherein an Al mixed crystal ratio x is 0<x<0.6, and a low refractive index film comprising an AlInP layer; and a light emitting part comprising an active layer sandwiched between a first conductivity cladding layer and a second conductivity cladding layer, wherein: a film thickness of each of the AlGaAs layer and AlInP layer making up the first conductivity type distributed Bragg reflector is determined by following formulas (1) to (3): t 1 ={λ 0 /(4× n 1 )}×α (1), t 2 ={λ 0 /(4× n 2 )}×(2−α) (2), and 0.5<α<0.9 (3) wherein t 1 is a film thickness [nm] of the AlGaAs layer, t 2 is a film thickness [nm] of the AlInP layer, λ 0 is a wavelength [nm] of a light to be reflected by the Bragg reflector, n 1 is a refractive index of the AlGaAs layer to the wavelength of the light to be reflected by the Bragg reflector, and n 2 is a refractive index of the AlInP layer to the wavelength of the light to be reflected by the Bragg reflector.