| 摘要 |
A semiconductor device arranged to emit blue light comprises a substrate (10) and an active layer (12) formed of semiconductor materials, the lattice constant X of the active layer material being related to the lattice constant Y of the substrate material by the square root of 2 ( 2ROOT 2), and the [100] crystallographic axis of the second layer being aligned at 45 DEG to the [100] crystallographic axis of the first layer. With this arrangement the crystal lattices of the two layers (10, 12) are aligned uniformly, so that lattice mismatch defects do not occur between layers having quite different lattice constants. |
