Patent ID: 7652281

Claim:
A light emitting diode comprising: a first conductivity type GaAs substrate; a Bragg reflection layer comprising at least two kinds of materials having different Al compositions, each of which is selected from a first conductivity type Al x0 Ga 1−x0 As (0≦x0≦1); a lower cladding layer comprising a first conductivity type (Al x1 Ga 1−x1 ) y1 In 1−y1 P (0≦x1≦1, 0.4≦y1 ≦0.6); a light emitting layer comprising an intrinsic semiconductor layer having a multiquantum well structure comprising an (Al x2 Ga 1−x2 ) y2 In 1−y2 P (0≦x2≦1, 0.4≦y2≦0.6); an upper cladding layer comprising a second conductivity type (Al x3 Ga 1−x3 ) y3 In 1−y3 P (0≦x3≦1, 0.4≦y3≦0.6); and a current spreading layer comprising a second conductivity type GaP layer; wherein a first hydrogen concentration is not more than 2×10 17 cm −3 , a first carbon concentration is not more than 2×10 16 cm −3 , and a first oxygen concentration is not more than 2×10 16 cm −3 in each of the lower cladding layer, the light emitting layer, and the upper cladding layer, and a second hydrogen concentration is not more than 5×10 17 cm −3 , a second carbon concentration is not more than 5×10 17 cm −3 , and a second oxygen concentration is not more than 2×10 16 cm −3 in a partial region or in a total region of the current-spreading layer.