Ponente
Descripción
Since the emergence of perovskites as photovoltaic materials, replacing silicon solar cells, more stable and non-toxic alternatives have been long needed. To address the stability issue, one proposed alternative is the double vacancy-ordered 0-dimensional perovskites, which tend not to exhibit phase changes upon exposure to air, unlike conventional $APbX_3$. However, when reducing the dimensionality, these types of crystals exhibit better properties in the field of optoelectronics. Thus, in this work, the $Cs_2Te_{1-x}Cl_6$: Erx crystal is synthesized via a solid-state reaction, and its luminescent properties are investigated. It is found that the Te optical transitions give rise to self-trapped excitons, and the $[ErCl_6]^{-3}$ octahedra exhibit both down-shifting and up-conversion luminescence. Furthermore, structural properties are characterized by X-ray diffraction and Raman spectroscopy.
