Plasmon-assisted directional infrared photoluminescence of HgTe nanocrystals
Résumé
HgTe nanocrystals offer a unique spectral tunability with both absorption and emission covering the near and mid-infrared as well as the THz window. Nevertheless, a very limited amount of work has been dedicated to electroluminescence from this material. An efficient diode not only requires designing a structure that achieves a high electrical efficiency (i.e., efficient electron and hole injections), but also finding a way to efficiently extract the emitted photons. The shift from visible to infrared certainly demands revisiting the strategies proposed for shorter wavelengths (microlens arrays). Here we demonstrate that a metallic grating can be used to enhance the PL signal up to a factor 4 while enabling directionality in the emission, which is driven by the grating period.
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