Photoluminescence of divalent cobalt ions in tetrahedral sites of zinc orthotitanate

Espinoza, V.A.A.; López, A.; Neumann, Reiner; Sosman, L.P.; Pedro, S.S.

doi:10.1016/j.jallcom.2017.05.188

Cited by 8 publications

(9 citation statements)

References 28 publications

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“…This emission wavelength position, a few nanometers from the band barycenter (694 nm), was chosen to allow the observation of the greatest possible number of transitions in the visible region. The spectrum is similar to the results observed for tetrahedrally coordinated Co 2+ in other materials [27][28][29] . From the Tanabe-Sugano diagram 31 , these bands were attributed to the spin-forbidden transitions 4 A 2 ( 4 F) → 2 A 1 ( 2 G) at 574 nm (17421 cm -1 ) and 4 A 2 ( 4 F) → 2 E( 2 G) at 602 nm (16611 cm -1 ), and to the spin-allowed transition 4 A 2 ( 4 F) → 4 T 1 ( 4 P) at 657 nm (15220 cm -1 ).…”

Section: Discussionsupporting

confidence: 87%

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Polycrystalline Compound of Co2+-doped Zn2SnO4: Structural and Photoluminescent Properties

et al. 2022

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In this work, Zn 2 SnO 4 :Co 2+ (0.1%) was obtained through a solid-state reaction at high temperature using ZnO, SnO 2 , and CoCO 3 . The sample was investigated using X-ray diffraction, X-ray fluorescence, scanning electron microscopy, and photoluminescence spectroscopy. Rietveld refinements of the X-ray diffraction data showed two crystalline phases, Zn 2 SnO 4 and SnO 2 , with proportions of 97.24% and 2.76%, respectively, while Zn and Sn atoms were observed by X-ray fluorescence. Scanning electron microscopy images showed the polycrystalline nature of the material. Photoluminescence spectroscopy showed two emission bands in the red and near-infrared regions, with the broader and more intense band having a barycenter at 694 nm. The intensity of the emission changed with the excitation wavelength, whereas the barycenter remained unchanged. The intensity, shape, and position of the bands, as well as the calculated crystal field parameters, indicate the insertion of Co 2+ ions in the tetrahedral sites of the Zn 2 SnO 4 material.

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Section: Discussionsupporting

confidence: 87%

“…Photoluminescence measurements of Zn 2 TiO 4 :Co 2+ at room temperature 29 showed a broad, intense, and homogeneous band from 675 to 750 nm, with a barycenter at 714 nm when the sample was excited with 630 nm light. The energy parameters obtained from the spectra were Dq = 188 cm -1 , B = 808 cm -1 , and C = 3636 cm -1 , with Dq/B = 0.23.…”

Section: Discussionmentioning

confidence: 98%

Polycrystalline Compound of Co2+-doped Zn2SnO4: Structural and Photoluminescent Properties

et al. 2022

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“…It is also possible to estimate the energy parameter values using a method where the Dq/B ratio is obtained from the d 3 Tanabe-Sugano diagram alongside the band energy positions observed in the excitation spectrum [48,49]. Initially, a selected transition will serve as a parameter for indexing the other transitions.…”

Section: Emission and Excitation Spectramentioning

confidence: 99%

Broadband photoluminescence in a ceramic (Mg2SnO4–SnO2):Cr3+ system

et al. 2021

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This study reports the synthesis and photoluminescence spectroscopic studies of Cr3+-doped Mg2SnO4–SnO2 ceramics. The crystal structure was analyzed by X-ray powder diffraction, and photoluminescence was investigated at room temperature. The diffractogram confirmed the presence of Mg2SnO4 and SnO2 phases. Photoluminescence spectroscopy identified broad and intense emission bands assigned to the Cr3+ cation occupation in octahedral Mg2SnO4 sites and an orange band assigned to SnO2 emission. All spectra were analyzed and interpreted according to crystal field theory and Tanabe–Sugano theory for the d3 electronic configuration. The broad and intense emission band covering the visible/near-infrared region suggests that this system may be a promising material for use as an active medium in a broadband light source at room temperature.

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“…Sosman describes the emission properties of Zn 2 TiO 4 :Mn 2+ , showing bands in the green (532 nm) and red (690 nm) wavelengths assigned to the spin-forbidden transitions of Mn 2+ with dopant occupation at tetrahedral and octahedral sites, respectively [15]. Espinoza details the emission of this system doped with Co 2+ related to a broadband in the infrared region at 714 nm assigned to the occupation of Co 2+ at the tetrahedral sites, replacing Zn 2+ [16]. A work reporting the optical properties of this lattice doped with Ni 2+ is in development and will be published soon.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we give a follow-up of our previous research [15,16], presenting the synthesis by solid-state reaction of Zn 2 TiO 4 doped with Cr 3+ , investigating the formation of the compound by X-ray diffraction measurements and using Rietveld refinement. Photoluminescence (PL), photoluminescence excitation (PLE) and emission decay measurements were used to determine the spectroscopic properties of the synthesized compound, and the emissions of the doped and undoped samples were compared.…”

Section: Introductionmentioning

confidence: 99%

Zn2TiO4 photoluminescence enhanced by the addition of Cr3+

2019

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In this work, the photoluminescent properties of Zn 2 TiO 4 :Cr 3+ are presented. Samples were prepared from ZnO, TiO 2 and Cr 2 O 3 by solid-state reaction. The compound formation was confirmed by X-ray diffraction. Emissions were obtained using photoluminescence spectroscopy at room temperature. The system crystallizes in the space group Fd3m with an inverse spinel structure. The emission spectrum presents a broad and intense band in the near-infrared region. Photoluminescence excitation shows two bands in the visible frequency range assigned to octahedral Cr 3+ transitions. Cr 3+-doped and undoped sample emissions were compared. Optical spectra were analyzed and interpreted according to the crystal field theory and the Tanabe-Sugano energy matrices for the d 3 configuration by calculating the Dq and B parameters. This work is a follow-up of the previous research on transition metal cations used as dopants in a Zn 2 TiO 4 lattice, and the current results suggest that the system might be a promising luminescence source at room temperature.

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Photoluminescence of divalent cobalt ions in tetrahedral sites of zinc orthotitanate

Cited by 8 publications

References 28 publications

Polycrystalline Compound of Co2+-doped Zn2SnO4: Structural and Photoluminescent Properties

Polycrystalline Compound of Co2+-doped Zn2SnO4: Structural and Photoluminescent Properties

Broadband photoluminescence in a ceramic (Mg2SnO4–SnO2):Cr3+ system

Zn2TiO4 photoluminescence enhanced by the addition of Cr3+

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