Structural Properties, Photoluminescence, and Judd-Ofelt Parameters of Eu3+- Doped CoNb2O6 Phosphor

Mustafa İlhan; Lütfiye Feray Güleryüz; Mete Kaan Ekmekci

Makale detayları

Structural Properties, Photoluminescence, and Judd-Ofelt Parameters of Eu3+- Doped CoNb2O6 Phosphor

Yazarlar:

Mustafa İlhan | Lütfiye Feray Güleryüz | Mete Kaan Ekmekci

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Inorganic Chemistry | Instrumental Methods

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.10 Issue 3, pp.745-756

Belge Tipi:

Makale

Yayın Tarihi:

8/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001292799

pISSN:

2149-0120

Anahtar kelimeler:

Özet:

 Trivalent Eu-activated CoNb2O6 phosphors were fabricated using the molten salt method, which provides enhanced homogeneity and low sintering temperature. The ceramic samples were examined by spectral and structural analyses. In X-ray diffractions, the single phase of orthorhombic columbite type CoNb2O6 structure was obtained for 0.5-10 mol Eu3 doping concentrations, while a two theta peak shift towards the smaller angles occurred. SEM examinations show an irregular morphology and sub-micron grain sizes. In photoluminescence PL spectra, the phosphors showed typical Eu3 emissions with the 5F0  7FJ J0, 1, 2, 3, 4 transitions, and high emission peaks were observed at the 5D0  7F2 transition. The photoluminescence of CoNb2O6:Eu3 decreased over 5 mol because of the concentration quenching. The energy transfer mechanism and critical distance of the phosphor are the dipole-dipole dd interaction, and 15.70 Å, respectively. The spectral features of the phosphors were assessed by calculating the Judd-Ofelt intensity parameters Ω2, Ω4 from the PL emission spectrum. The low Ω2 parameter values orand the Ω4Ω2 trend for CoNb2O6:Eu3 phosphors were related to the less covalent or more ionic character of the Eu3O2 bond and the high local symmetry of the Eu3 sites, while the high Ω4 parameter values may be ascribed to the decrease in the electron density in the ligands.

 Trivalent Eu-activated CoNb2O6 phosphors were fabricated using the molten salt method, which provides enhanced homogeneity and low sintering temperature. The ceramic samples were examined by spectral and structural analyses. In X-ray diffractions, the single phase of orthorhombic columbite type CoNb2O6 structure was obtained for 0.5-10 mol Eu3 doping concentrations, while a two theta peak shift towards the smaller angles occurred. SEM examinations show an irregular morphology and sub-micron grain sizes. In photoluminescence PL spectra, the phosphors showed typical Eu3 emissions with the 5F0  7FJ J0, 1, 2, 3, 4 transitions, and high emission peaks were observed at the 5D0  7F2 transition. The photoluminescence of CoNb2O6:Eu3 decreased over 5 mol because of the concentration quenching. The energy transfer mechanism and critical distance of the phosphor are the dipole-dipole dd interaction, and 15.70 Å, respectively. The spectral features of the phosphors were assessed by calculating the Judd-Ofelt intensity parameters Ω2, Ω4 from the PL emission spectrum. The low Ω2 parameter values orand the Ω4Ω2 trend for CoNb2O6:Eu3 phosphors were related to the less covalent or more ionic character of the Eu3O2 bond and the high local symmetry of the Eu3 sites, while the high Ω4 parameter values may be ascribed to the decrease in the electron density in the ligands.

 Trivalent Eu-activated CoNb2O6 phosphors were fabricated using the molten salt method, which provides enhanced homogeneity and low sintering temperature. The ceramic samples were examined by spectral and structural analyses. In X-ray diffractions, the single phase of orthorhombic columbite type CoNb2O6 structure was obtained for 0.5-10 mol Eu3 doping concentrations, while a two theta peak shift towards the smaller angles occurred. SEM examinations show an irregular morphology and sub-micron grain sizes. In photoluminescence PL spectra, the phosphors showed typical Eu3 emissions with the 5F0  7FJ J0, 1, 2, 3, 4 transitions, and high emission peaks were observed at the 5D0  7F2 transition. The photoluminescence of CoNb2O6:Eu3 decreased over 5 mol because of the concentration quenching. The energy transfer mechanism and critical distance of the phosphor are the dipole-dipole dd interaction, and 15.70 Å, respectively. The spectral features of the phosphors were assessed by calculating the Judd-Ofelt intensity parameters Ω2, Ω4 from the PL emission spectrum. The low Ω2 parameter values orand the Ω4Ω2 trend for CoNb2O6:Eu3 phosphors were related to the less covalent or more ionic character of the Eu3O2 bond and the high local symmetry of the Eu3 sites, while the high Ω4 parameter values may be ascribed to the decrease in the electron density in the ligands.

 Trivalent Eu-activated CoNb2O6 phosphors were fabricated using the molten salt method, which provides enhanced homogeneity and low sintering temperature. The ceramic samples were examined by spectral and structural analyses. In X-ray diffractions, the single phase of orthorhombic columbite type CoNb2O6 structure was obtained for 0.5-10 mol Eu3 doping concentrations, while a two theta peak shift towards the smaller angles occurred. SEM examinations show an irregular morphology and sub-micron grain sizes. In photoluminescence PL spectra, the phosphors showed typical Eu3 emissions with the 5F0  7FJ J0, 1, 2, 3, 4 transitions, and high emission peaks were observed at the 5D0  7F2 transition. The photoluminescence of CoNb2O6:Eu3 decreased over 5 mol because of the concentration quenching. The energy transfer mechanism and critical distance of the phosphor are the dipole-dipole dd interaction, and 15.70 Å, respectively. The spectral features of the phosphors were assessed by calculating the Judd-Ofelt intensity parameters Ω2, Ω4 from the PL emission spectrum. The low Ω2 parameter values orand the Ω4Ω2 trend for CoNb2O6:Eu3 phosphors were related to the less covalent or more ionic character of the Eu3O2 bond and the high local symmetry of the Eu3 sites, while the high Ω4 parameter values may be ascribed to the decrease in the electron density in the ligands.

Makale detayları

Structural Properties, Photoluminescence, and Judd-Ofelt Parameters of Eu3+- Doped CoNb2O6 Phosphor

Yazarlar:

Mustafa İlhan | Lütfiye Feray Güleryüz | Mete Kaan Ekmekci

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Inorganic Chemistry | Instrumental Methods

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.10 Issue 3, pp.745-756

Belge Tipi:

Makale

Yayın Tarihi:

8/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001292799

pISSN:

2149-0120

CoNb2O6

XRD

Eu3+ doping

photoluminescence

Judd-Ofelt analysis

Sayı

Makale detayları

Structural Properties, Photoluminescence, and Judd-Ofelt Parameters of Eu3+- Doped CoNb2O6 Phosphor

Yazarlar: Mustafa İlhan | Lütfiye Feray Güleryüz | Mete Kaan Ekmekci

Yayıncı: Turkish Chemical Society

Ana Başlıklar: Inorganic Chemistry | Instrumental Methods

Dergi: Journal of the Turkish Chemical Society Section A: Chemistry Vol.10 Issue 3, pp.745-756

Belge Tipi: Makale

Yayın Tarihi: 8/2023

Belge Dili: İngilizce

Document ID (Org No.): 2001292799

pISSN: 2149-0120

CoNb2O6

XRD

Eu3+ doping

photoluminescence

Judd-Ofelt analysis

Sayı

Yazarlar:

Mustafa İlhan | Lütfiye Feray Güleryüz | Mete Kaan Ekmekci

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Inorganic Chemistry | Instrumental Methods

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.10 Issue 3, pp.745-756

Belge Tipi:

Makale

Yayın Tarihi:

8/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001292799

pISSN:

2149-0120