| 摘要 |
A strained semiconductor heterostructure (10) comprises an injection region comprising a first emitter layer (11) having p-type conductivity and a second emitter layer (12) having n-type conductivity, and a light generation layer (13) positioned between the first emitter layer (11) and the second emitter layer (12). An electron capture region (14) is positioned between the light generation layer (13) and the second emitter layer (12), said electron capture region comprising a capture layer (16) adjacent to the second emitter layer, and a confining layer (15) adjacent to said electron capture layer. According to the present invention, the widths and materials of the confining and capture layers (15, 16) are selected to provide energy difference between one of localized energy levels for electrons in the capture layer (16) and the conduction band bottom of the second emitter layer (12) equal to the energy of the optical phonon.
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