Study of the influence of dopant precursor on the growth and properties of Li-doped ZnO

Ariza, Rocío; Pavón, Fernando; Urbieta, A.; Fernández, Paloma

doi:10.1016/j.jpcs.2020.109354

Cited by 14 publications

(14 citation statements)

References 31 publications

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“…The rods emerged from the vertices of a central, almost square-shaped ball. X-ray microanalysis and X-ray diffraction showed that these balls were formed of Li2SO4, constituting the only regions in which residual S could be detected [19]. As shown in Figure 2b, the second morphology studied consisted of long tapered nails, with a hexagonal cross-section size between 1 and 2 µm and lengths around 100 µm.…”

Section: Resultsmentioning

confidence: 95%

“…For an initial content below 10 wt%, the resonances are less defined. In a previous work [19], it was shown that the incorporation of Li in the growth process of the ZnO structures produces a change in the morphology. It is for a Li 2 O starting content of 10 wt% when the best results in terms of obtaining intense and defined optical resonant modes are found.…”

Section: Methodsmentioning

confidence: 97%

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Evolution of Whispering Gallery Modes in Li-Doped ZnO Hexagonal Micro- and Nanostructures

et al. 2020

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The formation of optical cavities in Li-doped ZnO nanostructures was investigated. By means of the vapor–solid method, long micro- and nanostructures with a hexagonal cross-section were grown. These morphologies were favorable for Fabry-Pérot and whispering gallery modes to appear. A variety of structures with different sections was studied using µ-photoluminescence in both the transverse electric (TE) and transverse magnetic (TM) polarizations, showing well-pronounced optical resonant modes. The results showed a dominance of whispering gallery modes that were in good agreement with the calculated refractive index. The quality factor (Q) and finesse (F) were estimated, which demonstrated the quality of Li:ZnO structures as optical cavities.

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Section: Resultsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 97%

Evolution of Whispering Gallery Modes in Li-Doped ZnO Hexagonal Micro- and Nanostructures

et al. 2020

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“…The pellets were then submitted to a thermal treatment at 950 • C for 10 h, under an N 2 flux of 1.5 L/min. The experimental setup for vapor-solid growth has been described elsewhere [9].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In the nano-and microscale, an enhancement of the electroconductivity or a high specific area must be added, widening the scope for new applications [5][6][7][8]. On the other hand, when we move to the micro-and nanoscale, the morphology of the structures plays a key role, and many of the properties of the material, for instance, luminescent properties, are strongly dependent on morphology [8][9][10]. Behind the morphology-dependent properties are the crystal structure and the surface and surface defect structure derived from it.…”

Section: Introductionmentioning

confidence: 99%

Characterization, Luminescence and Optical Resonant Modes of Eu-Li Co-Doped ZnO Nano- and Microstructures

2022

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ZnO nano- and microstructures co-doped with Eu and Li with different nominal concentrations of Li were grown using a solid vapor method. Different morphologies were obtained depending on the initial Li content in the precursors, varying from hexagonal rods which grow on the pellet when no Li is added to ribbons to sword-like structures growing onto the alumina boat as the Li amount increases. The changes in the energy of the crystallographic planes leading to variations in the growth directions were responsible for these morphological differences, as Electron Backscattered Diffraction analysis shows. The crystalline quality of the structures was investigated by X-ray diffraction and Raman spectroscopy, showing that all the structures grow in the ZnO wurtzite phase. The luminescence properties were also studied by means of both Cathodoluminescence (CL) and Photoluminescence (PL). Although the typical ZnO luminescence bands centered at 3.2 and 2.4 eV could be observed in all cases, variations in their relative intensity and small shifts in the peak position were found in the different samples. Furthermore, emissions related to intrashell transitions of Eu3+ ion were clearly visible. The good characteristics of the luminescent emissions and the high refraction index open the door to the fabrication of optical resonant cavities that allow the integration in optoelectronic devices. To study the optical cavity behavior of the grown structures, µ-PL investigations were performed. We demonstrated that the structures not only act as waveguides but also that Fabry–Perot optical resonant modes are established inside. Quality factors around 1000 in the UV region were obtained, which indicates the possibility of using these structures in photonics applications.

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“…This indicates that the refractive index of the rods is high enough to confine efficiently the light inside them. Since the cross sections of the rods are, in general, irregular, it is hard to find structures showing an optical microcavity behaviour as found in other systems [28][29][30]. To perform this experiment, a 325 nm laser is used to locally excite the PL of the rod, using a 40× objective.…”

Section: Resultsmentioning

confidence: 99%

Characterization of K6Ta10.8O30 Microrods with Tetragonal Tungsten Bronze-Like Structure Obtained from Tailings from the Penouta Sn-Ta-Nb Deposit

et al. 2020

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In this work, a deep characterization of the properties of K6Ta10.8O30 microrods has been performed. The starting material used to grow the microrods has been recovered from mining tailings coming from the Penouta Sn-Ta-Nb deposit, located in the north of Spain. The recovered material has been submitted to a thermal treatment to grow the microrods. Then, they have been characterized by scanning electron microscopy, X-ray diffraction, micro-Raman and micro-photoluminescence. The results of our study confirm that the K6Ta10.8O30 microrods have a tetragonal tungsten bronze-like crystal structure, which can be useful for ion-batteries and photocatalysis.

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Study of the influence of dopant precursor on the growth and properties of Li-doped ZnO

Cited by 14 publications

References 31 publications

Evolution of Whispering Gallery Modes in Li-Doped ZnO Hexagonal Micro- and Nanostructures

Evolution of Whispering Gallery Modes in Li-Doped ZnO Hexagonal Micro- and Nanostructures

Characterization, Luminescence and Optical Resonant Modes of Eu-Li Co-Doped ZnO Nano- and Microstructures

Characterization of K6Ta10.8O30 Microrods with Tetragonal Tungsten Bronze-Like Structure Obtained from Tailings from the Penouta Sn-Ta-Nb Deposit

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