Effect of Na doping on photoluminescence and laser stimulated nonlinear optical features of ZnO nanostructures

Deekshitha, U.G.; Upadhya, K N; Antony, Albin; Ani, Aninamol; Nowak, M.; Kityk, I.V.; Jedryka, J.; Poornesh, P.; Manjunatha, K.; Kulkarni, Suresh D.

doi:10.1016/j.mssp.2019.06.001

Cited by 23 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, the cell constants and volume changes in the Ga 30 MO [33] 5.80 [33] ---- The calculations showed that the cell constants and the volume V of the Ga 30 MO 48 a/b/c system increased compared with those of the Ga 32 O 48 system, because the radius of Li ion (0.6 Å) [43] is smaller than that of Ga ion (0.62 Å). [26] In addition, the radius of Na (0.95 Å) [44] and K ions (1.38 Å) [45] are larger than that of Ga ion. Therefore, the three ions replaced the Ga ion.…”

Section: Model Construction and Calculation Methodsmentioning

confidence: 99%

First‐Principles Study of the Influences of Point Vacancies (V_Ga, H_i) on the Photocatalytic and Magnetic Performance of Ga₂O₃:Li/Na/K Systems

Bai,

Hou,

et al. 2023

Physica Status Solidi (b)

View full text Add to dashboard Cite

Under vacuum environment, an H interstitial must exist when Ga2O3 is prepared by organometallic chemical vapor deposition. However, few first‐principles systematic studies have been conducted on the influences of point vacancies (VGa, Hi) on the photocatalytic performance and magnetism of Ga2O3:(Li or Na or K) systems, and VGa is a challenge in experiments. Therefore, the first‐principles generalized gradient approximation GGA + U theory is adopted in this study. A first‐principles study is conducted on the formation energy (E f), photocatalytic performance, and magnetism of Ga30MO48 (M = Li or Na or K) and Ga30MHiO48 systems. In the results, it is shown that under Ga‐poor conditions, the Ga30MO48 and Ga30MHiO48 systems are structurally stable and prone to doping. The Ga30MHiO48 system has lower E f, more structural stability, and easier doping than the Ga30MO48 system. The Ga30KO48 system exhibits magnetism, mainly generated by the O1−‐2p spin‐polarized wandering electrons near VGa. The spin‐polarized O2−‐2p and Ga‐4s states near VGa contribute to the hybrid coupling double‐exchange interaction. Moreover, the visible spectrum of the Ga30LiHiO48 system exhibits a significant redshift, a relatively high carrier activity, carrier separation, and relative maximum lifetime. It is relatively best as a photocatalyst.

show abstract

Section: Model Construction and Calculation Methodsmentioning

confidence: 99%

First‐Principles Study of the Influences of Point Vacancies (V_Ga, H_i) on the Photocatalytic and Magnetic Performance of Ga₂O₃:Li/Na/K Systems

Bai,

Hou,

et al. 2023

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…Scherrer equation = l b q D K cos [40] is used to determine the crystallite size of ZnO NPs. Where D is the crystallite size, k is Scherrer's constant of value 0.9, λ is the wavelength of the x-rays source (1.54 A°for Cu K α radiation), β is the full width at half-maximum (FWHM) and θ is Bragg's angle of the diffraction peak corresponding to planes.…”

Section: Scherrer Methodsmentioning

confidence: 99%

Eco-friendly Green Synthesis of stable ZnO nanoparticles using citrus limon: X-Ray Diffraction Analysis and Optical Properties

Kem¹,

Ansari²,

Prathap³

et al. 2022

Phys. Scr.

View full text Add to dashboard Cite

Eco-friendly stable ZnO nanoparticles (NPs) were synthesized by sol-gel method using citrus limon as a chelating agent. The structural analysis and optical properties of ZnO NPs annealed in air ambient at different temperatures ranging from 600 to 900 °C are reported. A detailed x-ray diffraction (XRD) analysis of ZnO NPs has been discussed. Morphological and optical properties of the NPs were investigated using Field Emission Scanning Electron Microscopy (FE-SEM), XRD, Diffuse Reflectance Spectroscopy (DRS), Photoluminescence (PL), Fourier Transform Infrared spectroscopy (FTIR) and Raman Spectroscopy techniques. The FE-SEM reveals that the average particle size of ZnO NPs increased from 62 to 77 nm due to agglomeration of particles or Ostwald ripening which usually happens at high temperature. Physical and microstructural properties such as crystallite size, strain, stress and dislocation density of ZnO NPs were obtained from XRD spectra studies and compared the estimated parameters by various models. It is observed that, the crystallite size increased after annealing and the strain present in NPs is due to defects. Kubelka-Munk function is used to obtain bandgap of NPs from DRS spectra. A slight decrease in the bandgap of ZnO NPs is due to the increase in particle size. PL spectra reveals that the emission around 402 nm near the UV region is attributed to the near band edge emission (NBE) and emission peaks in a visible region is due to the transition of electrons from traps in bandgap to the valence band.

show abstract

“…Figure 6a-e show the temperature dependence of the µPL emissions of the ZnO, ZN2, ZN4, ZN6, and ZN10 samples, respectively. The spectra displayed two main optical emission bands: one associated with crystalline defects in visible range between 1.40 and 2.95 eV, and another in the UV range from approximately 2.95 to 3.5 eV, which were attributed to band-to-band transitions (near to the absorption band edge, NBE) and excitonic complexes (~2.95-3.5 eV), respectively [35][36][37]. As seen in Figure 6a, it is evident that the emissions associated with NBE remained predominant in the ZnO films, regardless of temperature.…”

Section: Optical Characterizationmentioning

confidence: 99%

Exploring Na Doping in ZnO Thin Films: Electrical and Optical Insights

Silva,

Vargas,

Peres

et al. 2024

Coatings

View full text Add to dashboard Cite

Strategies to achieve p-type behavior in semiconductor oxides are an important current topic of research. Our study showed that sodium-doped zinc oxide thin films are a plausible approach. The insertion of dopant allowed a transition between n-type p-type electrical behavior in specific temperature ranges around 300 K. Annealing procedures under controlled atmospheres, including Ar, N2, and O2, increased the hole density up to a magnitude of 1016 cm−3, although this also reduced the window temperature. The micro-photoluminescence spectra showed an enhancement of defect-related emissions as the dopant content increased. Notably, yellow-green emissions (around 2.38 eV–520 nm) were the most prominent in the as-grown samples. After annealing, a strong redshift of the defect band was observed (around 1.85 eV–670 nm). Our findings showed that p-type ZnO:Na films exhibited emissions associated with RGB primary colors. In a chromaticity diagram, as-grown samples appeared near the white range, annealed films were close to the warm white area, and O2 annealed films trended within the red range.

show abstract

Effect of Na doping on photoluminescence and laser stimulated nonlinear optical features of ZnO nanostructures

Cited by 23 publications

References 30 publications

First‐Principles Study of the Influences of Point Vacancies (V_Ga, H_i) on the Photocatalytic and Magnetic Performance of Ga₂O₃:Li/Na/K Systems

First‐Principles Study of the Influences of Point Vacancies (V_Ga, H_i) on the Photocatalytic and Magnetic Performance of Ga₂O₃:Li/Na/K Systems

Eco-friendly Green Synthesis of stable ZnO nanoparticles using citrus limon: X-Ray Diffraction Analysis and Optical Properties

Exploring Na Doping in ZnO Thin Films: Electrical and Optical Insights

Contact Info

Product

Resources

About

Effect of Na doping on photoluminescence and laser stimulated nonlinear optical features of ZnO nanostructures

Cited by 23 publications

References 30 publications

First‐Principles Study of the Influences of Point Vacancies (VGa, Hi) on the Photocatalytic and Magnetic Performance of Ga2O3:Li/Na/K Systems

First‐Principles Study of the Influences of Point Vacancies (VGa, Hi) on the Photocatalytic and Magnetic Performance of Ga2O3:Li/Na/K Systems

Eco-friendly Green Synthesis of stable ZnO nanoparticles using citrus limon: X-Ray Diffraction Analysis and Optical Properties

Exploring Na Doping in ZnO Thin Films: Electrical and Optical Insights

Contact Info

Product

Resources

About

First‐Principles Study of the Influences of Point Vacancies (V_Ga, H_i) on the Photocatalytic and Magnetic Performance of Ga₂O₃:Li/Na/K Systems

First‐Principles Study of the Influences of Point Vacancies (V_Ga, H_i) on the Photocatalytic and Magnetic Performance of Ga₂O₃:Li/Na/K Systems