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Synthèse et propriétés de monocristaux, de poudres, films minces ou hétérostructures

Etudes à l'interface avec la matière biologique

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Papier de Nehed et Aubry 2020

Publié le 29 juin 2020
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Communiqué du 17 juin 2020 au 28 août 2020

Le papier "ZnO nanowires/YAG:Ce functional heterostructure coatings with tunable optical properties" a été publié dans Journal of Alloys and Compounds

Nehed paper

Nehed paper

Ici vous trouverez le papier de Nehed Amara et Aubry Martin
"Luminescent ZnO nanowires (NWs)/YAG:Ce heterostructure coatings have been elaborated by impregnating cheap hydrothermally-grown ZnO NWs array with ground commercial YAG:Ce nanoparticles (NPs). TEM and photoluminescence quantum yield measurements have been used to make YAG:Ce NPs suitable for soaking within the ZnO NWs. Structural, morphological and optical studies of functional nanocomposite coatings have evidenced an optimal amount of YAG:Ce allowing the visible photo-luminescence signal of ZnO NWs nearly to triple whereas slight red shift accompanied by an enlargement on the long wavelength side has been observed for YAG:Ce emission. These phenomena have been explained through the existence of structural defects on ZnO NWs surface and emission mechanisms implying either scattering effects or the passivation of NWs surface by YAG:Ce NPs. Furthermore, an energy diagram involving different structural defects of ZnO NWs as well as Ce3þ ions energy levels has been built from excitation and emission spectra and from decay curves recorded monitoring the orange-red emission of ZnO. The elaborated heterostructure functional coatings have proved to exhibit tunable optical properties in terms of spectral distribution playing on the excitation source. Hence, they appear as a smartway for developing LEDs-based devices with flexible photometric parameters for a broader range of optical applications."


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mise à jour le 29 juin 2020

  • Tutelle CNRS
  • Tutelle Grenoble INP
Université Grenoble Alpes