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Demonstration of strong saturation of traps in multiple, narrow, slightly asymmetric coupled quantum wells

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Abstract

Continuous-wave photoluminescence excitation spectra of multiple, narrow, slightly asymmetric coupled quantum wells at room temperature have been measured. As the laser intensity increases, the photoluminescence intensity initially increases at a rate that is higher than square-law dependence and finally approaches square-law dependence. This phenomenon can be attributed to the process in which a dominant nonradiative recombination at the traps undergoes strong saturation with weak radiative recombination of free carriers. The intensity-dependent trapping efficiency and ratio between electron and hole nonradiative decay times, and the ratio between trapping and nonradiative recombination rates have been determined from the experiment.

© 1993 Optical Society of America

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