Plasmon‐Assisted Directional Infrared Photoluminescence of HgTe Nanocrystals
Erwan Bossavit, Tung Huu Dang, Puyuan He, Mariarosa Cavallo, Adrien Khalili, Corentin Dabard, Huichen Zhang, Djamal Gacemi, Mathieu G. Silly, Claire Abadie, Bruno Gallas, Debora Pierucci, Yanko Todorov, Carlo Sirtori, Benjamin T. Diroll, Aloyse Degiron, Emmanuel Lhuillier, Angela Vasanelli
Abstract
Abstract 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 is 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, a metallic grating is used to enhance the photoluminscence signal up to a factor of 4 while enabling directionality in the emission, which is driven by the grating period.