| 摘要 |
PROBLEM TO BE SOLVED: To improve light-emitting efficiency at low cost by a method wherein the thickness of each barrier layer and the thickness of each quantum well layer are provided so that a level at an X point of the barrier layer, a primary level at a Γ point of the quantum well layer adjacent to one side and a secondary level at a Γ point of the quantum well layer adjacent to the other side are mutually resonated. SOLUTION: When a reverse bias voltage is applied between electrodes 11 and 12, a first level X1 point of a barrier layer 21-N conforms to a first level Γ1 point of a quantum well layer 22-(N-1) adjacent to the barrier layer 21-N, so that the first level X1 point of the barrier layer 21-N and the first level Γ1 point of the quantum well layer 22-(N-1) are mutually resonated. Further, the first level X1 point of the barrier layer 21-N conforms to a second level Γ2 point of a quantum well layer 22-N adjacent to the barrier layer 21-N, so that the first level X1 point of the barrier layer 21-N and the second level Γ2 point of the quantum well layer 22-N adjacent to the barrier layer 21-N are mutually resonated. Therefore, a thickness of each of barrier layers 21-0 to 21-N and a thickness of each of quantum well layers 22-0 to 22-N are set so as to satisfy them. |
