The study on crystal defects-involved energy transfer process of Eu3+ doped ZnO lattice

Yang, Lei; Jiang, Zhongcheng; Dong, Jiazhang; Pan, Anlian; Zhuang, Xiujuan

doi:10.1016/j.matlet.2014.04.191

Cited by 24 publications

(5 citation statements)

References 13 publications

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“…The FTIR characteristic absorbance bands of the gaseous products-H 2 O, CO 2 , and CO can be observed: [39,40]. In the temperature range 398-473 K (FTIR spectrum at minute [13][14], the released gases consist of H 2 O-physically adsorbed water-and CO 2 , adsorbed from the atmosphere. As the thermal treatment continues and the temperature increases, all the precursors simultaneously release CO 2 and CO (FTIR spectra at minute 37-38, 670-671 K) due to the decomposition of zinc oxalate.…”

Section: Thermal Analysismentioning

confidence: 99%

“…Recently, Yang and co-workers have evidenced that at smaller Eu concentration (1-3 mol%) a great number of defects are generated in the ZnO lattice, such as oxygen vacancy (V O ), or interstitial oxygen (O i ), and these defects play an important role in the energy transfer process from the host lattice to Eu 3? [14]. Also, it has been reported that the optical properties of the metaldoped zinc oxide strongly depends on the particles size, shape, and the surrounding environment [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

et al. 2015

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The paper presents a simple, reproducible, controllable, and direct wet chemical synthesis method for Zn 1-x Eu x O nanoparticles. The full understanding of decomposition mechanism of the as-obtained oxalate precipitate was achieved based on the thermal analysis correlated with the evolved gas analysis and FTIR spectroscopy. The structure, morphology, and optical luminescent properties of the Zn 1-x Eu x O nanoparticles have been investigated by X-ray diffraction, Raman spectroscopy, HRTEM, SAED, XPS, and PL. The XRD studies reveal the formation of a hexagonal wurtzite-type structure. The presence of Eu 2 O 3 cubic structure can be observed up to 0.5 mol% Eu, suggesting that the solubility of the divalent or trivalent Eu into the ZnO lattice is limited. The formation of Eu 2 O 3 secondary phase at higher Eu concentration is sustained by Raman spectroscopy and XPS, as well. The TEM investigations of the Eu-doped ZnO samples illustrate the presence of aggregates with different shapes and dimensions formed by agglomerated spherical and polyhedral nanoparticles with sizes ranging from 20 to 120 nm. The effect of europium concentration on the structural and morphological characteristics, as well as on the luminescent properties was studied with special emphasis on the europium chemical states-Eu 2? and Eu 3? . The PL measurements sustain the presence of both divalent and trivalent europium ions into the ZnO host lattice and, at the same time, an increase of its defects density induced by the dopant presence.

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Section: Thermal Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

et al. 2015

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“…However, different results regarding the efficiency of the energy transfer mechanisms from ZnO to RE ions have been obtained. Several energy transfers from the ZnO host to RE ion models have been proposed [12][13][14]. There are those who assume a mediated process of defect levels [12] and others assume the formation of a bound exciton after trapping free carriers by the RE-bound levels, which excites the 4f core levels [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Several energy transfers from the ZnO host to RE ion models have been proposed [12][13][14]. There are those who assume a mediated process of defect levels [12] and others assume the formation of a bound exciton after trapping free carriers by the RE-bound levels, which excites the 4f core levels [13,14]. In another model, the recombination of free excitons results in UV emission and/or transfers energy to RE ions [13].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Eu doped ZnO micropods prepared by chemical bath deposition on p-Si substrate

Althumairi

Baig

Kayed

et al. 2022

Vacuum

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“…Luo et al (2014) reported the efficient energy transfer from the ZnO host to the RE 3 þ and also between RE 3 þ (Eu 3 þ /Tb 3 þ ) under excitation at 385 nm [10]. Regarding, the effect of the ions on the structure, Yang et al (2014) reported the decreasing of average particle size as a function of increasing of molar ratio between Eu 3 þ /Zn 2 þ from 0.01 to 0.03 [11].…”

mentioning

confidence: 98%

Photoluminescent and structural properties of ZnO containing Eu3+ using PEG as precursor

Reis

Oliveira

Pécoraro

et al. 2015

Journal of Luminescence

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a b s t r a c tZnO powders containing different concentrations of Eu 3 þ synthetized using polyethylenoglycol (PEG) as precursor are reported. The viscous solutions were obtained and heated-treated at different temperatures to obtain materials in powder form in order to analyze the influence of temperature on photoluminescent and structural properties. The synthesis proposed in this paper enable the fabrication of the zinc oxide material containing Eu 3 þ with high relative concentrations. TG and DTA analyses allowed the behavior of the decomposition of precursors used in the synthesis to be observed. PEG used as precursor proved to be a very interesting molecule, producing materials with good photoluminescent properties. The structural characteristics of the material were evaluated by X-ray diffraction, followed by a Rietveld refinement. The results obtained show that is possible to incorporate Eu 3 þ in a ZnO host matrix with relatively high concentrations. The cell parameters showed minimal distortion and were independent of Eu 3 þ concentration. From calculation of the band gap, the difference of energy between HOMO and LUMO of 3.28 eV was determined which is in accordance with the literature. The presence of Eu 3 þ makes the material a red emitter and the color of emission is dependent on wavelength of excitation (294 or 463 nm). The excitation at 294 nm promotes the photoluminescence emission in the visible region with large band assigned to the defects present in the ZnO host matrix. However when the material is excited at 463 nm (exactly on Eu 3 þ energy level) bands with intense emission around 612 nm are observed and assigned to the hypersensitive intraconfigurational transition of Eu 3 þ and the large band below that wavelength it is observed. The presence of a large band emission when the samples are excited at 463 nm is an indication of the energy transfer from Eu 3 þ to the ZnO host matrix. The results obtained demonstrate that with this synthesis, the structural and photoluminescent properties of the product make it a potential candidate for applications in solar cells.

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The study on crystal defects-involved energy transfer process of Eu3+ doped ZnO lattice

Cited by 24 publications

References 13 publications

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

Characterization of Eu doped ZnO micropods prepared by chemical bath deposition on p-Si substrate

Photoluminescent and structural properties of ZnO containing Eu3+ using PEG as precursor

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