A novel violet/blue light-emitting device based on Ce2Si2O7

Li, Ling; Wang, Shenwei; Mu, Guangyao; Yin, Xue; Ou, Kai; Lü, Yi

doi:10.1038/srep16659

Cited by 13 publications

(7 citation statements)

References 39 publications

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“…In addition to these, many low-intensity peaks were also observed but are difficult to recognize. All these features match beautifully with the characteristic Raman spectra of rhombohedral BiFeO 3 phase, which shows good correlation with XRD results . Again, Figure b depicts the Raman scattering spectra of MCeO 2 nanorods, where the sharp tower-like polarization band located at 464 cm –1 represents the F 2g symmetric vibration mode of cubic fluorite CeO 2 .…”

Section: Resultssupporting

confidence: 72%

Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

et al. 2020

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For better exciton separation and high catalytic activity, the most trailblazing stratagem is to construct defect engineered low-dimensional p−n heterojunction framed photocatalytic systems. In this context, we have developed a rod−sheet (1D−2D) p−n heterojunction of MCeO 2 −BiFeO 3 by a simple hydrothermal method and scrutinized its photocatalytic performance toward N 2 fixation and phenol/Cr(VI) detoxification. The intimate contact between MCeO 2 and BiFeO 3 in the junction material is well established via X-ray diffraction (XRD), UV−vis diffuse reflectance spectrosopy (DRS), transmission electron microscopy (TEM), and photoelectrochemical studies. Further, scanning electron microscopy (SEM) and TEM pictures clearly support the decoration of MCeO 2 nanorods over BiFeO 3 sheets and also depict the junction boundary. Additionally, photoluminescence (PL), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and Raman measurements give solid evidence toward the presence of an oxygen vacancy. Moreover, the Mott−Schottky result indicates a feasible band edge potential favoring the p−n heterojunction with a built-in electric field between BiFeO 3 and MCeO 2 favoring a double charge dynamic. The MCeO 2 −BFO p−n junction displays a notable catalytic activity, i.e., 98.2% Cr(VI) reduction and 85% phenol photo-oxidation, and produces 117.77 μmol h −1 g −1 of ammonia under light irradiation. Electrochemical analysis suggests a four-electron/five proton-coupled N 2 photoreduction pathway. The designed oxygen vacancy oriented p−n heterojunction suffering double charge migration shows significant catalytic performance due to effective electron−hole separation as justified via PL, electrochemical impedance spectra (EIS), and Bode phase analysis.

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Section: Resultssupporting

confidence: 72%

Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

et al. 2020

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“…Here a strong blue emission peak and week one centered at 415 and 439 nm respectively, are mainly associated with the defect levels localized between the O 2p and Ce 4f band levels. The other weak blue emissions centered at 467, 481, and 495 are possibly due to the surface defects and Ce 3+ states. ,, Pure BiOI shows an emission peak nearly at 420 nm consistent with the emission characteristic of bismuth oxyiodide . From Figure a, it was found that 40% BiOI–CeO 2 exhibits a stronger PL intensity peak than the neat CeO 2 as well as BiOI suggesting faster recombination of charge carriers in the composite.…”

Section: Resultsmentioning

confidence: 60%

Facile Synthesis of CeO₂ Nanosheets Decorated upon BiOI Microplate: A Surface Oxygen Vacancy Promoted Z-Scheme-Based 2D-2D Nanocomposite Photocatalyst with Enhanced Photocatalytic Activity

2017

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Construction of a visible light driven Z-schemebased photocatalytic system is a hot topic of research because of the potential to alleviate both energy and environmental issues. In the present study a series of surface vacancy mediated BiOI−CeO 2 nanocomposites were prepared and their crystallographic, morphological, optical, and electrochemical behavior were characterized through XRD, TEM, FESEM, UV−vis DRS, PL, ESI, and Mott−Schottky techniques. From the XPS analysis, it could be said that a high amount of oxygen defects and metallic bismuth were present on the composite than neat CeO 2 which was the major cause of enhancement in the photocatalytic activity. Further the photocatalytic efficiency of the as prepared samples was tested toward RhB decolorization/phenol oxidation as well as for O 2 gas evolution. It was observed that 40 wt % BiOI−CeO 2 nanocomposite exhibited highest photocatalytic activity among neat and other composites, i.e., 89% decolorization of 100 ppm RhB and produces 323 μmol/2h of O 2 under visible light illumination. To justify the enhanced photocatalytic activity of the material a Z-scheme-based charge transfer mechanism was proposed. Where surface oxygen vacancy exists on CeO 2 , I 3 − /I − reversibility pair through Bi metal on BiOI, scavenger experiment, PL spectra, and Nyquist plot provide solid evidence toward a Z-scheme charge transfer pathway. This work will provide some useful information in course of developing of Z-scheme-based photocatalyst without an external mediator.

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“…Nevertheless, numerous studies have demonstrated the efficient emission of Ce 3+ in samples deposited from CeO 2 targets. [15][16][17] Unfortunately, depositing from CeO 2 target requires a post-growth annealing step at high temperature to form optically active Ce 3+ ions which could generate Ce clusters due to the high thermal budget. Considering the above mentioned arguments, we believe that doping the SiO X N Y host matrix with Ce appears to be an interesting approach for achieving efficient cerium emission.…”

Section: Introductionmentioning

confidence: 99%

“…That is why recent researchers have turned to investigate host matrices easily integrable on silicon such as silicon oxide. 14,15 Regarding the Ce doped devices devoted to light emitting devices on silicon, the feasibility of a CeO 2 and Ce 2 Si 2 O 7 LEDs has been demonstrated, 16,17 while a Ce-doped SiO x matrix shows a strong emission of the Ce 3+ ion. 18,19 Unfortunately, it exists some major drawbacks hampering such applications.…”

Section: Introductionmentioning

confidence: 99%

The nitrogen concentration effect on Ce doped SiO_xN_y emission: towards optimized Ce³⁺ for LED applications

et al. 2018

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Ce-doped SiO x N y films are deposited by magnetron reactive sputtering from a CeO 2 target under nitrogen reactive gas atmosphere. Visible photoluminescence measurements regarding the nitrogen gas flow reveal a large emission band centered at 450 nm for a sample deposited under a 2 sccm flow. A special attention is paid to the origin of such an emission at high nitrogen concentration. Different emitting centers are suggested in Ce doped SiO x N y films (e.g. band tails, CeO 2 , Ce clusters, Ce 3+ ions), with different activation scenarios to explain the luminescence. X-ray photoelectron spectroscopy (XPS) reveals the exclusive presence of Ce 3+ ions whatever the nitrogen or Ce concentrations, while transmission electron microscopy (TEM) shows no clusters or silicates upon high temperature annealing. With the help of photoluminescence excitation spectroscopy (PLE), a wide excitation range from 250 nm up to 400 nm is revealed and various excitations of Ce 3+ ions are proposed involving direct or indirect mechanisms. Nitrogen concentration plays an important role on Ce 3+ emission by modifying Ce surroundings, reducing the Si phase volume in SiO x N y and causing a nephelauxetic effect. Taking into account the optimized nitrogen growth parameters, the Ce concentration is analyzed as new parameter. Under UV excitation, a strong emission is visible to the naked eye with high Ce 3+ concentration (6 at. %). No saturation of the photoluminescence intensity is observed, confirming again the lack of Ce cluster or silicate phase formation due do the nitrogen presence.

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A novel violet/blue light-emitting device based on Ce2Si2O7

Cited by 13 publications

References 39 publications

Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

Facile Synthesis of CeO₂ Nanosheets Decorated upon BiOI Microplate: A Surface Oxygen Vacancy Promoted Z-Scheme-Based 2D-2D Nanocomposite Photocatalyst with Enhanced Photocatalytic Activity

The nitrogen concentration effect on Ce doped SiO_xN_y emission: towards optimized Ce³⁺ for LED applications

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A novel violet/blue light-emitting device based on Ce2Si2O7

Cited by 13 publications

References 39 publications

Efficient Photon Conversion via Double Charge Dynamics CeO2–BiFeO3 p–n Heterojunction Photocatalyst Promising toward N2 Fixation and Phenol–Cr(VI) Detoxification

Efficient Photon Conversion via Double Charge Dynamics CeO2–BiFeO3 p–n Heterojunction Photocatalyst Promising toward N2 Fixation and Phenol–Cr(VI) Detoxification

Facile Synthesis of CeO2 Nanosheets Decorated upon BiOI Microplate: A Surface Oxygen Vacancy Promoted Z-Scheme-Based 2D-2D Nanocomposite Photocatalyst with Enhanced Photocatalytic Activity

The nitrogen concentration effect on Ce doped SiOxNy emission: towards optimized Ce3+ for LED applications

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Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

Facile Synthesis of CeO₂ Nanosheets Decorated upon BiOI Microplate: A Surface Oxygen Vacancy Promoted Z-Scheme-Based 2D-2D Nanocomposite Photocatalyst with Enhanced Photocatalytic Activity

The nitrogen concentration effect on Ce doped SiO_xN_y emission: towards optimized Ce³⁺ for LED applications