%0 Journal Article
%T The blue emission at 2.8£¿eV in strontium titanate: evidence for a radiative transition of self-trapped excitons from unbound states
%A F. Agull¨®-L¨®pez
%A J. T. Graham
%A M. L. Crespillo
%A W. J. Weber
%A Y. Zhang
%J Materials Research Letters
%D 2019
%R https://doi.org/10.1080/21663831.2019.1604444
%X ABSTRACT The origin of the blue emission in SrTiO3 has been investigated as a function of irradiation fluence, electronic excitation density, and temperature using a range of ion energies and masses. The emission clearly does not show correlation with the concentration of vacancies generated by irradiation but is greatly enhanced under heavy-ion irradiation. The intensity ratio of the 2.8 and 2.5£¿eV bands is independent of fluence at all temperatures, but it increases with excitation rate. The 2.8£¿eV emission is proposed to correspond to a transition from conduction band states to the ground state level of the self-trapped exciton center. GRAPHICAL ABSTRACT The blue emission at 2.8£¿eV in strontium titanate: evidence for a radiative transition of self-trapped excitons from unbound states All authors M. L. Crespillo , J. T. Graham, F. Agull¨®-L¨®pez, Y. Zhang & W. J. Weber https://doi.org/10.1080/21663831.2019.1604444 Published online: 17 April 2019 Display full size IMPACT STATEMENT A novel mechanism attributes the origin of the intriguing blue band in SrTiO3 to a non-localized transition of the self-trapped exciton center from conduction band states to the ground level
%U https://www.tandfonline.com/doi/full/10.1080/21663831.2019.1604444