Temperature Features of Photoluminescence Decay in Amorphous Hafnia Nanotubes

Nanotubular HfO₂ arrays hold significant promise for advanced optoelectronic and nanoelectronic applications. However, the optical properties of nominally pure hafnia with optically active centers of intrinsic origin are far from being sufficiently investigated. In this work we have conducted research on the wide-range temperature effects in the photoluminescence (PL) kinetics of anion-defective hafnia nanotubes with an amorphous structure, synthesized by the electrochemical oxidation method. The experimental data obtained for the temperature effect on PL decay are quantitatively analyzed by calculating the appropriate energy of the activation barrier. The results obtained provide the deeper understanding of luminescent mechanisms in hafnia nanotubes and insights into the potential of HfO₂-based nanostructures for advanced thermo-optical applications.