| 摘要 |
PURPOSE:To prevent the laser oscillation by changing the current density inside a device by a method wherein an LED of the edge light emitting type is constituted to have a current constriction structure where the width of a groove is changed continuously inside the device. CONSTITUTION:An n-type InP current block layer 2 is grown on a p-type InP substrate 1. Then, a groove 8 is made on the n-type InP block layer 2 by a selective etching method by making use of a photoresist film as a mask in such a way that the groove is 9 mum in width on the light emitting side and 0 in width on the reflection side. A p-type InP clad layer 3, a p-type InGaAsP active layer 4, an n-type InP clad layer 5 and an n-type InGaAsP cap layer 6 are grown in succession on the layer. The current density to be injected into the active layer is smaller than the current density inside the groove 8 because an electric current is spread in the transverse direction in the p-type InP clad layer 3; in addition, because the width of the groove 8 becomes gradually narrow from the light emitting side toward the reflection side, the current density to be injected into the active layer in a region near the reflection side becomes considerably small as compared with another region near the light emitting side. |
