Abstract
Spin-related emission properties have important applications in the future information technology; however, they involve microscopic ferromagnetic coupling, antiferromagnetic or ferrimagnetic coupling between transition metal ions and excitons, or d state coupling with phonons is not well understood in these diluted magnetic semiconductors (DMS). Fe3+ doped ZnSe nanoribbons, as a DMS example, have been successfully prepared by a thermal evaporation method. Their power-dependent micro-photoluminescence (PL) spectra and temperature-dependent PL spectra of a single ZnSe:Fe nanoribbon have been obtained and demonstrated that alio-valence ion doping diminishes the exciton magnetic polaron (EMP) effect by introducing exceeded charges. The d-d transition emission peaks of Fe3+ assigned to the 4T2 (G) → 6A1 (S) transition at 553 nm and 4T1 (G) → 6A1 (S) transition at 630 nm in the ZnSe lattice have been observed. The emission lifetimes and their temperature dependences have been obtained, which reflected different spin–phonon interactions. There exists a sharp decrease of PL lifetime at about 60 K, which hints at a magnetic phase transition. These spin–spin and spin–phonon interaction related PL phenomena are applicable in the future spin-related photonic nanodevices.
Highlights
Information technology has advanced quickly to quantum-based units, which are usually realized in nanosized structures and are small in size, high in speed and consume less energy
Fe doped ZnSe nanoribbons were synthesized by the chemical vapor deposition (CVD) method with Au used as the catalyst
We synthesized high quality Fe3+ doped ZnSe nanoribbons by the CVD method, which is confirmed by SEM images, X-ray diffractometer (XRD) patterns, micro-Raman spectrum and PL spectra
Summary
Information technology has advanced quickly to quantum-based units, which are usually realized in nanosized structures and are small in size, high in speed and consume less energy In these nanostructures, electrons with more quantum characters except charges could be exploited and modulated to present specific properties with higher efficiency. Transition metal ion doped ZnSe nano-materials, as a diluted magnetic semiconductor (DMS), have significant potential in optics and. Heitz et al studied the Fe3+ doped ZnO crystal by means of emission, excitation, and magneto-optical spectroscopy, and showed that the d-d transition of isolated Fe3+ ions on Zn2+ lattice sites [21]. Spin-related micro-photoluminescence study on DMS has significance for spin-related devices, bosonic laser and other spintronics applications, while alio-valence ions doped semiconductor compared with iso-valence ions show different optics and spin-related electrical properties. Fe3+ doped ZnSe nanoribbons and studied the temperature and power dependent emissions by micro-photoluminescence spectra and lifetime measurements, in which the spin–exciton interaction, spin–spin interaction and exciton–phonon coupling have been identified
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