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In As ∕ In 0.53 Ga 0.23 Al 0.24 As quantum dashes (QDashes) have been investigated in a temperature-dependent photoluminescence (PL) experiment. It has been observed that the increase of the QDash size shifts the emission peak to the longer wavelength and leads to a slower thermal quenching of PL. This thermal quenching can be described by a standard expression with two characteristic activation energies which are attributed to the electron escape and the heavy-hole escape to the conduction and valence continua in QDash barriers, respectively. The found activation energies are in the range of 21–64 and 121–223meV for the first and the second quenching mechanism, respectively.
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Podemski et al. (2006) studied this question.
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