Electroluminescence from Silicon-Based Light-Emitting Devices with Erbium-Doped ZnO Films: Strong Enhancement Effect of Titanium Codoping.

We report on the visible and near-infrared electroluminescence (EL) from the light-emitting device (LED) based on the erbium (Er)-doped ZnO (ZnO:Er)/SiO 2 /n + -Si heterostructure, wherein an ∼10 nm thick SiO 2 intermediate layer serves as the energy plateau for producing hot electrons, which come from n + -Si via the trap-assisted tunneling mechanism. These hot electrons excite the doped Er 3+ ions by inelastic collision, enabling the Er-related EL from the aforementioned LED. More importantly, by means of codoping the appropriate content of titanium (Ti) into the ZnO:Er film, the aforementioned Er-related emissions can be significantly enhanced. The density functional theory calculations indicate that the Ti-codoping improves rather than degrades the symmetry of the crystal field around the optically active Er 3+ ions, hence not increasing the intra-4f transition probabilities of Er 3+ ions. However, it is found that Ti-codoping nearly eliminates the segregation of Er 3+ ions near the ZnO/SiO 2 interface. Moreover, Ti-codoping is derived to result in a number of Zn vacancies, which provide the sites for incorporating Er 3+ ions in the ZnO matrix. For the above two reasons, the Ti-codoping promotes the incorporation of optically active Er 3+ ions into the ZnO matrix, thus enhancing the EL from the aforementioned LED.