Influence of SO42− anionic group substitution on the enhanced photoluminescence behaviour of red emitting CaMoO4:Eu3+ phosphor

Letswalo, M.L.A.; Reddy, Leelakrishna; Balakrishna, A.; Swart, H.C.; Ntwaeaborwa, O.M.

doi:10.1016/j.jallcom.2020.157022

Cited by 26 publications

(11 citation statements)

References 44 publications

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“…14 Figure 2A illustrates the XPS spectrum of CENMO ceramics at room temperature, where we observed only Ca, Eu, Nb, Mo, and O. The positions of the individual characteristic peaks were assigned to the elements 39,40 The peak centered at 530.08 eV is attributed to the Eu-O bond in CENMO, which indicates that the oxygen ion in the ceramic is bound to the europium ion; the peak located around 531.68 eV is the chemical state of the sample with adsorbed oxygen.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2B displays the XPS high‐resolution scanning spectra of O 1 s . The fitted spectrum was divided into two peaks at 530.08 eV and 531.68 eV, which are lattice oxygen and chemical state oxygen 39,40 . The peak centered at 530.08 eV is attributed to the Eu‐O bond in CENMO, which indicates that the oxygen ion in the ceramic is bound to the europium ion; the peak located around 531.68 eV is the chemical state of the sample with adsorbed oxygen.…”

Section: Resultsmentioning

confidence: 99%

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Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

et al. 2022

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Solid‐solution ceramics show a potential in the field of electronic devices. In particular, it is necessary to investigate the photoluminescence and conductive properties of CaEuNbMoO8 (CENMO) solid solution ceramics. It is demonstrated that the sintered ceramics appear as CaMoO4 phase with scheelite structure. The results of X‐ray photoelectron spectroscopy show that the abnormal reduction of Eu3+→Eu2+ occurs in the ceramics, which is due to the formation of VCa′′$V_{Ca}^{^{\prime\prime}}$ vacancy caused by the substitution of Ca2+ by Eu3+, making it act as electron donors. The change of local symmetry of Eu3+ ions in ceramics results in a strong red fluorescence, and the charge transition between Eu, Nb, and Mo ions and O ions in the host lattice results in the near‐ultraviolet (near‐UV) excitation. As a result, CaEuNbMoO8 ceramic materials have promising applications in both near‐ultraviolet excited light‐emitting diodes and thermistors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

et al. 2022

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“…Here, 613 nm was the signal induced by the 5 D 0 → 7 F 2 electric dipole transition, 590 nm was the 5 D 0 → 7 F 1 magnetic dipole transition, and the two red emission spectra (651 and 700 nm) were the 5 D 0 → 7 F 3 and 5 D 0 → 7 F 4 electric dipole signals [ 32 ]. In this experiment, because the intensity of the red emission (613 nm) spectrum stemming from the 5 D 0 → 7 F 2 electric dipole transition was 10.9 times greater than the intensity of the orange emission (590 nm) from the 5 D 0 → 7 F 1 magnetic dipole transition, Eu 3+ ions in the host lattice were found to be located at the sites of inversion symmetry, not inversion symmetry [ 33 ]. Color coordinates were an important factor when evaluating the performance of a phosphor, and a proper understanding of color purity is important when applying these phosphors in the lighting industry.…”

Section: Resultsmentioning

confidence: 99%

Fabricated Flexible Composite for a UV-LED Color Filter and Anti-Counterfeiting Application of Calcium Molybdate Phosphor Synthesized at Room Temperature

Jung

2022

Materials

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Crystalline CaMoO4 and rare-earth-doped CaMoO4:RE3+ (RE = Tb, Eu) phosphors were synthesized at room temperature using a co-precipitation method. The crystal structure of the synthesized powder was a tetragonal structure with a main diffraction peak (112) phase. When CaMoO4 was excited at 295 nm, it showed a central peak of 498 nm and light emission in a wide range of 420 to 700 nm. Rare-earth-ion-doped CaMoO4:Tb3+ was excited at 288 nm and a green light emission was observed at 544 nm, and CaMoO4:Eu3+ was excited at 292 nm and a red light emission was observed at 613 nm. To take advantage of the light-emitting characteristics, a flexible composite was manufactured and a color filter that could be used for UV-LEDs was manufactured. In addition, it was suggested that an ink that could be checked only by UV light could be produced and applied to banknotes so as to prevent counterfeiting.

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“…The Al-O-Al is located at 74.38 eV, and the potential of O-Al is 531.48 eV. The peaks at 1135.38 and 1165.08 eV (Figure f) are derived from Eu 3+ 3d 5/2 and Eu 3+ 3d 3/2 , indicating that Eu ions mainly exist in the trivalent form . Moreover, we examined the concentration of Eu 3+ ions according to the XPS data.…”

Section: Resultsmentioning

confidence: 99%

Amorphous Alumina: A Bright Red Matrix for Flexible and Transparent Anti-counterfeiting

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Flexible and transparent anti-counterfeiting films have aroused great attention for their potential applications in information security and assurance of product quality recently. Much attention has been focused on the crystalline structure matrix; however, studies on amorphous alumina hosts are limited.Here, an amorphous alumina doped with Eu 3+ phosphor was successfully synthesized by a soft chemical route. Its structure evolution, morphology, and photoluminescence features were analyzed. The amorphous alumina host offers free access for Eu 3+ and simultaneously avoids the issue of lattice mismatch. A bright red emission was achieved for Eu 3+ doping over a very wide range. Subsequently, an ultraviolet (UV)-light-stimulated anticounterfeiting film composed of a Eu 3+ -doped amorphous alumina phosphor and thermoplastic polyurethane was fabricated. The film possesses excellent stretchability, flexibility, transparency, and water resistance. The transparency under daylight and red emission patterns under UV irradiation provide the composite film with excellent anti-counterfeiting abilities. The results show that this new type of amorphous alumina matrix produces an excellent comprehensive performance film that provides great practical significance and application in the anti-counterfeiting aspect.

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Influence of SO42− anionic group substitution on the enhanced photoluminescence behaviour of red emitting CaMoO4:Eu3+ phosphor

Cited by 26 publications

References 44 publications

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Fabricated Flexible Composite for a UV-LED Color Filter and Anti-Counterfeiting Application of Calcium Molybdate Phosphor Synthesized at Room Temperature

Amorphous Alumina: A Bright Red Matrix for Flexible and Transparent Anti-counterfeiting

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Influence of SO42− anionic group substitution on the enhanced photoluminescence behaviour of red emitting CaMoO4:Eu3+ phosphor

Cited by 26 publications

References 44 publications

Photoluminescence and conductive properties of CaEuNbMoO8 solid‐solution ceramics

Photoluminescence and conductive properties of CaEuNbMoO8 solid‐solution ceramics

Fabricated Flexible Composite for a UV-LED Color Filter and Anti-Counterfeiting Application of Calcium Molybdate Phosphor Synthesized at Room Temperature

Amorphous Alumina: A Bright Red Matrix for Flexible and Transparent Anti-counterfeiting

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Product

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Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics