Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.239
Publication date: 28th August 2024
Photoluminescence (PL) down conversion has been a major success for wide band gap colloidal material, now being commercially available. More recently large efforts have been devoted to infrared (IR) detection using nanocrystal as active material [1]. This combination of cost-effective production and high performances further raise the interest for using the PL of such nanocrystals in the IR range. In particular, incoherent sources are missing beyond telecom wavelengths. Targeted applications relate to active imaging (machine vision for material sorting, damage inspection on food), LIDAR, or airfield lightning. The main challenge relates to the dop of PL efficiency as wavelength is increased. Part of this drop relates to intrinsic behaviour (lengthening of radiative lifetime) and some to the presence of non-radiative process that have to be correlated with the less mature growth of heterostructure using narrow band gap core. In this talk I will review our recent effort to push the electroluminescence of such IR nanocrystals beyond 2 µm [2] and then to further address limitation relates to their surface passivation. Another direction of interest is the coupling of such IR material to photonic structure. This effort has been very successful for photodetection to enhance the light absorption. Here, I will show that the coupling to plasmonic cavity or dielectric cavity is highly effective to shape the PL spectrum and enhance the PL directivity [3-5]. Last, I will show that the benefit of such cavity can also be applied to heavy metal free IR nanocrystals.
The project is supported by ERC grants AQDtive (grant n°101086358). We acknowledge the use of clean-room facilities from the “Centrale de Proximité Paris-Centre”. This work was supported by French state funds managed by the Agence Nationale de la Recherche through the grant Copin (ANR-19-CE24-0022), Frontal (ANR-19-CE09-0017), Bright (ANR-21-CE24-0012), MixDFerro (ANR-21-CE09-0029), Quicktera (ANR-22-CE09-0018), DIRAC (ANR-24-Astrid), camIR (ANR-24-CE42), Piquant (ANR-24-CE09).
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