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.
M. L. Crespillo et al., "The Blue Emission at 2.8 EV in Strontium Titanate: Evidence for a Radiative Transition of Self-Trapped Excitons from Unbound States," Materials Research Letters, vol. 7, no. 7, pp. 298 - 303, Taylor & Francis Ltd., Jul 2019.
The definitive version is available at https://doi.org/10.1080/21663831.2019.1604444
Nuclear Engineering and Radiation Science
Keywords and Phrases
Electronic Excitation Density; Ionoluminescence; Oxygen Vacancies; Self-Trapped Excitons; SrTiO3
International Standard Serial Number (ISSN)
Article - Journal
© 2019 The Authors, All rights reserved.
01 Jul 2019