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characteristics of a conventional QCL structure by Kruck et al., a first growth heterostructure (1st growth) and two differently doped quantum wire intersubband emitter structures. Note that the samples have different sizes as stated above.
(a) Electroluminescence spectra of the first growth heterostructure for different driving currents at a duty cycle of 31.6% and a heat sink temperature of . (b) Maximum intensity and transition energy of the transition in dependence of the driving current.
Electroluminescence spectra of a quantum wire intersubband emitter structure for different driving currents at a duty cycle of and a heat sink temperature of . The inset shows the maximum intensity of the corresponding transitions as a function of duty cycle.
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