Doping as a strategy to tune color of 2D colloidal nanoplatelets
Résumé
Among colloidal nanocrystals, 2D nanoplatelets (NPL) made of II-VI compounds, appear as a special class of emitters with especially narrow photoluminescence signal. However the PL signal in the case of NPL is only tunable by discrete step. Here we demonstrate that doping is a viable path to finely tune the color of this NPL from green to red, making them extremely interesting as phosphor for wide gamut display. In addition using a combination of luminescence spectroscopy, tight binding simulation, transport and photoemission, we provide a consistent picture for the Ag doped CdSe NPL. The Ag state is strongly bound and located 340 meV above the valence band of the bulk material. The Ag dopant shifts the Fermi level toward the valence by up to 400 meV but preserve the n-type nature of the material.
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