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

F. Agulló-López¹  Y. Zhang²  M. L. Crespillo³  J. T. Graham³  W. J. Weber³ 

[1] Centro de Microanálisis de Materiales, CMAM-UAM;Oak Ridge National Laboratory;University of Tennessee;

关键词: SrTiO3;    electronic excitation density;    self-trapped excitons;    oxygen vacancies;    ionoluminescence;   

DOI  :  10.1080/21663831.2019.1604444

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown