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

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

doi:10.1002/pssa.202100805

Cited by 2 publications

(3 citation statements)

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“…The results are very promising, with a Q value of 1022 for a wavelength of 384 nm, which indicates that these structures can be used in photonics applications in the UV range. The incorporation of Li into the structures improves their crystallinity and shape regularity which drastically enhances their behavior as optical resonators, as already reported in previous works [28][29][30].…”

Section: − E Lowsupporting

confidence: 73%

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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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Section: − E Lowsupporting

confidence: 73%

“…Nevertheless, due to the mismatch between ionic radii (Zn +2 ~0.74 Å; and Eu +3 ~0.94 Å) and charge unbalance (the most frequently used are the RE trivalent ions), effective doping of ZnO with rare elements is still challenging. In this regard, co-doping with alkali metals, particularly Li, is a very good option [24,[27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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

2022

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“…Nevertheless, one of the main problems that we can face when doping with lanthanides is the mismatch between ionic radii (see Table 2) and the charge unbalance (the most frequently used are the RE trivalent ions). For these reasons, the effective doping of ZnO with rare elements is still challenging, although codoping strategies are a very good option [52,[54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

ZnO-Based Materials: From Pauli’s Nonsense to a Key Enabling Technology

Ramos-Justicia,

Ferreiro,

Flores-Carrasco

et al. 2023

Photonics

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In this work, we aim to highlight the increasing interest in semiconductors, particularly ZnO. A revision of the evolution of the scientific production on three selected topics has been conducted. As an indicator of scientific production, the number of publications indexed in the Web of Science Data Base has been used. The search terms selected range from the general to the particular: semiconductors, oxide semiconductors, and ZnO. The period considered is from 1 January 1900 to 6 June 2023. The importance of doping processes in tailoring the properties of these materials, and the relevance of the most recently derived applications are also revised. Since many of the most recent applications that have been developed or are under development refer to optoelecronic properties, doping with rare earth elements has a central role. This was the reason behind choosing the system ZnO doped with Rare Earth elements (Eu, Gd, and Ce) and codoped with Ru to illustrate the materials’ tuning potential of doping processes. Morphology, crystal structure, and luminescent properties have been investigated. Upon doping, both the Near Band Edge and the Deep Level emissions show a remarkable difference due to the change in the relative weight of the components constituting these bands. The spectra in all cases extend over the whole visible range, with a main emission in the violet-blue region corresponding to the Near Band Edge, and a broad band extending from the blue-green to orange-red region associated with the presence of different defects.

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

Cited by 2 publications

References 31 publications

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

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

ZnO-Based Materials: From Pauli’s Nonsense to a Key Enabling Technology

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