RT Journal Article
T1 Characterization, luminescence and optical resonant modes of Eu-Li Co-Doped ZnO Nano- and microstructures
A1 Pavón Martínez, Fernando
A1 Urbieta Quiroga, Ana Irene
A1 Fernández Sánchez, Paloma
AB ZnO nano- and microstructures co-doped with Eu and Li with different nominal concentrations of Li were grown using a solid vapor method. Different morphologies were obtained depending on the initial Li content in the precursors, varying from hexagonal rods which grow on the pellet when no Li is added to ribbons to sword-like structures growing onto the alumina boat as the Li amount increases. The changes in the energy of the crystallographic planes leading to variations in the growth directions were responsible for these morphological differences, as Electron Backscattered Diffraction analysis shows. The crystalline quality of the structures was investigated by X-ray diffraction and Raman spectroscopy, showing that all the structures grow in the ZnO wurtzite phase. The luminescence properties were also studied by means of both Cathodoluminescence (CL) and Photoluminescence (PL). Although the typical ZnO luminescence bands centered at 3.2 and 2.4 eV could be observed in all cases, variations in their relative intensity and small shifts in the peak position were found in the different samples. Furthermore, emissions related to intrashell transitions of Eu3+ ion were clearly visible. The good characteristics of the luminescent emissions and the high refraction index open the door to the fabrication of optical resonant cavities that allow the integration in optoelectronic devices. To study the optical cavity behavior of the grown structures, mu-PL investigations were performed. We demonstrated that the structures not only act as waveguides but also that Fabry-Perot optical resonant modes are established inside. Quality factors around 1000 in the UV region were obtained, which indicates the possibility of using these structures in photonics applications.
PB MDPI
SN 2076-3417
YR 2022
FD 2022-07
LK https://hdl.handle.net/20.500.14352/71972
UL https://hdl.handle.net/20.500.14352/71972
LA eng
NO ©2022 MDPIThis work was founded by the Complutense University of Madrid-Banco Santander via project UCM-Santander 2019 (PR87/19-22613) and Complutense University-Comunidad de Madrid via project PR65/19-22464.
NO Comunidad de Madrid / Universidad Complutense de Madrid
NO Universidad Complutense de Madrid / Banco Santander
DS Docta Complutense
RD 6 abr 2025