Lithium doping and photoluminescence properties of ZnO nanorods

Abstract

This article presents a comprehensive experimental study of optical properties of Li-doped ZnO nanorods grown by a low temperature (300 °C) thermal decomposition method. In particular, a study of the room temperature photoluminescence spectra dependence on the Li concentration is presented here. The doping of Li in ZnO nanorods results in a redshift in near band edge emission (NBE) compared to the undoped ZnO nanorods. Depending on the Li concentration, we observe a green emission in Photoluminescence spectra. The possible physical mechanisms governing the visible region luminescence are also discussed. These results show that Li-doped ZnO nanorods with strong visible region luminescence have potential applications in optoelectronic devices.

Morphology, Luminescence, and Optical Properties of Tb‐ and Li‐Codoped ZnO Elongated Nano‐ and Microstructures

“…It is known that Li does not produce any luminescence band by itself, however, the different positions that can occupy in the ZnO lattice, either as interstitial (Li i ) or substitutional (Li Zn ) influences the concentration of native defects. [ 24,25 ] At low Li content (red line spectrum in the figure), a shoulder at 2.0 eV is clearly observed, but the intensity of this component decreases as the Li content increases. This band has been related by some authors to differences in the rate of radiative transition from donors to the intrinsic acceptor defects (V Zn or O i ).…”

Morphology, Luminescence, and Optical Properties of Tb‐ and Li‐Codoped ZnO Elongated Nano‐ and Microstructures

“…It is known that Li does not produce any luminescence band by itself, however, the different positions that can occupy in the ZnO lattice, either as interstitial (Li i ) or substitutional (Li Zn ) influences the concentration of native defects. [24,25] At low Li content (red line spectrum in the figure), a shoulder at 2.0 eV is clearly observed, but the intensity of this component decreases as the Li content increases. This band has been related by some authors to differences in the rate of radiative transition from donors to the intrinsic acceptor defects (V Zn or O i ).…”

Effect of Zinc Oxide on the Efficiency Enhancement of Al/Li2O/PSi/Si/Al solar cell

“…However, it can conveniently hold an interstitial position (Li) due to the limited ionic radius of the Li-ion, which can serve as a donor. In general, the combination of ZnO with Li-ions boosts Egopt's value over that of pure ZnO lms [33]. Lithium itself does not induce any visible emission of luminescence, although the relative concentration of inherent defects varies with increasing doping percentage.…”

“…It was observed that Li generates additional holes at the Zn substitution site, while it generates additional electrons at the interstitial site. It can be hypothesized that Li serves as a defect mediator in ZnO NPs [32,33].…”