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.

中文翻译：

---

钛酸锶在2.8 eV处的蓝色发射：自结合态的自捕获激子发生辐射跃迁的证据

已经使用一定范围的离子能量和质量研究了SrTiO _3中蓝色发射的根源与辐照通量，电子激发密度和温度的关系。发射显然与辐射产生的空位浓度没有关系，但是在重离子辐射下会大大增强。2.8和2.5 eV波段的强度比在所有温度下均与注量无关，但随激发速率的增加而增加。提出2.8 eV发射对应于从自陷带激子中心的导带状态到基态能级的过渡。