Defects-induced nonlinear saturable absorption mechanism in europium-doped ZnO nanoparticles synthesized by facile hydrothermal method

Vinoditha, U.; Sarojini, B. K.; Sandeep, K.; Narayana, B.; Maidur, Shivaraj R.; Patil, P. S.; Balakrishna, Keshava

doi:10.1007/s00339-019-2732-4

Cited by 41 publications

(13 citation statements)

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“…The peak at 2932 cm À1 was due to C-H stretching vibrations. 33 The peaks observed in the region 3420 cm À1 correspond to O-H stretching vibrations, which indicates the existence of water adsorbed on the surface of the samples. 34 3.5 Photoluminescence study Fig.…”

Section: Ftir Studiesmentioning

confidence: 97%

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH₃ gas sensing

Shkir

2023

New J. Chem.

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Section: Ftir Studiesmentioning

confidence: 97%

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH₃ gas sensing

Shkir

2023

New J. Chem.

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“…The C−O−C stretching vibration has an energy of 1075 cm −1 . 30 The metal−oxygen (Eu−O) bond is characterized by peaks at 996 and 992 cm −1 . 35 Eu−O−H bond is attributed to the energy 909 cm −1 .…”

Section: Ftir Studymentioning

confidence: 99%

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Kachhap,

Fatima,

Yadav

et al. 2023

ACS Appl. Opt. Mater.

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We report blue emission, along with the characteristic green emission, in CsPbBr 3 nanocrystals (NCs) due to the doping of Eu 2+ ions. The doping of Eu 2+ was confirmed using TEM-EDAX, FTIR, and XPS techniques. The undoped CsPbBr 3 NCs show sharp green emission peaking at 515 nm (fwhm ∼24 nm). Whereas Eu 2+ :CsPbBr 3 NCs show two emission peaks at 498 and 442 nm with fwhm ∼20 and ∼13 nm, respectively. A shift in the green emission of doped NCs is because of reduced average particle size from 19 to 7 nm. The additional emission peak at 442 nm is assigned due to the 4f 6 ( 7 F J )5d 1 → 4f 7 transition of Eu 2+ ions. The intensities of blue and green emissions are both significantly influenced by changing the excitation wavelengths. The decay dynamics study suggests an energy transfer from CsPbBr 3 to the Eu 2+ ions. It is also inferred that Eu 2+ doping improves the radiative channels. Further, the CIE coordinate analysis depicts virtuous luminous efficacy of the optical radiation and significant color purity (>85%) of the emission spectra under different excitations. These optical studies show that the Eu 2+ :CsPbBr 3 NCs can be a potential candidate for multicolor LEDs, displays, and anticounterfeiting applications.

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“…The shallow and deep states formed in ZnO forbidden gap generally originate from four main point defects in the ZnO lattices including (i) zinc vacancy (V Zn ), (ii) zinc interstitials (Zn i ), (iii) oxygen vacancy (V Ã O ), and (iv) oxygen interstitials (O i ) [60]. These defect configurations arise from zinc-oxygen nonstoichiometry, abundance of which is dependent on preparation conditions [61]. The spectral pattern of sample S150 was fitted with a multi-peak Gaussian function to distinguish the different emission peaks.…”

Section: Linear Characterizationmentioning

confidence: 99%

“…In addition, Zn i and V ÁÃ O with transitions to ZnO valence band are considered to be responsible for 412 nm violet emission and 521 nm green emissions [62]. The red emission peak * 670 nm is normally associated with deep level oxygen interstitials [61].…”

Section: Linear Characterizationmentioning

confidence: 99%

Hollow ZnO microspheres self-assembled from rod-like nanostructures: morphology-dependent linear and Kerr-type nonlinear optical properties

Haghighatzadeh

Mazinani

Ostad

et al. 2021

J Mater Sci: Mater Electron

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Hollow nanostructures have attracted attention because of their unique physiochemical properties and broad potential applications in electronics, optics and photonics. In this study, a facile hydrothermal approach was developed to fabricate hollow ZnO microspheres via self-assembled rod-like nanostructures. The morphology-controlled synthesis was conducted by altering hydrothermal treatment temperature (150, 200 and 250 °C) in solutions containing zinc acetate dihydrate precursor and glycerol as the stabilizing agent. The morphological observations indicated that hydrothermally grown ZnO architectures could be reasonably adjusted by modulating hydrothermal reaction temperature. Possible growth routes are proposed to elucidate the formation process of ZnO microspheres with the rod-like nanostructures. Morphology-dependent absorbance and emission along with red-shifts with improved crystalline qualities were observed with increasing hydrothermal growth temperature. Kerr-type nonlinear optical characteristics examined using single-beam Z-scan technique in the near infrared spectral range under nanosecond Nd-YVO4 laser pulses showed positive values of nonlinear refraction providing an evidence of self-focusing behaviors at the excitation wavelength of 1064 nm in all the samples studied. The highest Kerr-type nonlinear susceptibility was estimated to be 2.31 × 10–6 esu for hollow ZnO microspheres grown at 250 °C, suggesting synergistic effects of surface morphologies on optical nonlinearities.

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Defects-induced nonlinear saturable absorption mechanism in europium-doped ZnO nanoparticles synthesized by facile hydrothermal method

Cited by 41 publications

References 50 publications

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH₃ gas sensing

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH₃ gas sensing

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Hollow ZnO microspheres self-assembled from rod-like nanostructures: morphology-dependent linear and Kerr-type nonlinear optical properties

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Defects-induced nonlinear saturable absorption mechanism in europium-doped ZnO nanoparticles synthesized by facile hydrothermal method

Cited by 41 publications

References 50 publications

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH3 gas sensing

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH3 gas sensing

Expanding the Emission of CsPbBr3 Nanocrystals in the Blue Region

Hollow ZnO microspheres self-assembled from rod-like nanostructures: morphology-dependent linear and Kerr-type nonlinear optical properties

Contact Info

Product

Resources

About

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH₃ gas sensing

Development of highly sensitive Al, Ga, and In-doped ZnO films by the drop casting method for NH₃ gas sensing

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region