Photoluminescence and photocatalytic properties of novel Bi2O3:Sm3+ nanophosphor

Sawant, Ashwini; Prashantha, S.C.; Naik, Ramachandra; Naik, Yashwanth V.; Nagabhushana, H.; Narasimhamurthy, K.N.

doi:10.1016/j.jsamd.2019.09.001

Cited by 15 publications

(9 citation statements)

References 35 publications

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“…3 a TEM (i), SAED pattern (ii), HRTEM (iii), EDX (iv) of (5 mol%) MNO:Sm 3+ NPs. b SEM images of MNO:Sm 3+ (5 mol%) NPs at various magnifications 4 G 5/2 → 6 H 5/2 , 6 H 7/2 , 6 H 9/2 and 6 H 11/2 respectively [13,15,35] since photo excited carriers transfer energy to Sm 3+ ions from the host lattice, resulting in the 4 G 5/2 → 6 H J/2 transitions and all the transitions were reflected in energy level diagram (Fig. 10).…”

Section: Resultsmentioning

confidence: 99%

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Basavaraju¹,

Prashantha²,

Nagabhushana

et al. 2021

SN Appl. Sci.

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Novel Sm3+ doped columbite-type orthorhombic structured MgNb2O6 (MNO) orange-red emitting phosphors were prepared by solution combustion method using ODH as a fuel. The powder phase purity, particle morphology, size, elemental composition, luminescence properties, photocatalytic behaviors and electrochemical studies of prepared samples were studied in detail. Photoluminescence emission spectra of MNO:Sm3+ nanophosphors show all the characteristic emissions of Sm3+ cations corresponds to the transitions 4G5/2 → 6Hj/2(j=5,7,9,11) when excited at 463 nm energy. Among these the strongest emission peak was at 608 nm which corresponds to 4G5/2 → 6H7/2 transition of Sm3+ cations in the host lattice. The luminescence quenching was confirmed by the dipole–dipole interaction among Sm3+ ions. As a result of J-O analysis the branching ratio (~ 58% > 50%) show that the phosphor was highly suitable for color display devices. Photocatalytic activity of MNO:Sm3+ (5 mol%) under UV light shows 99% degradation of AR-88 dye. Electrochemical Impedance Spectroscopy (EIS) confirms the reversibility of the redox reaction, which helps in sensing the presence of paracetamol and alcohol. Thus, MNO:Sm3+ phosphors have great potential applications in display, catalytic, photonic, chemical and thermal sensor applications.

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Section: Resultsmentioning

confidence: 99%

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Basavaraju¹,

Prashantha²,

Nagabhushana

et al. 2021

SN Appl. Sci.

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“…Thus, it shows excellent photocatalytic activity in the visible light range. 53 In order to further study the effect of hybrid orbitals of different elements in Bi based catalyst on crystal optical properties, 54 the PDOS 55 of different elements were calculated in the gure. In Fig.…”

Section: Activity Evaluation Of Catalystmentioning

confidence: 99%

Degradation of formaldehyde aqueous solution by Bi based catalyst and its activity evaluation

et al. 2022

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“…As one of the most efficient bismuth-based materials, bismuth oxide (Bi 2 O 3 ) is broadly applied for degrading dye effluent due to its nontoxicity, low cost, narrow band gap, chemical and biological inertness, fast light response, and nonglossy corrosion. − Bi 2 O 3 exists in various crystal forms, such as monoclinic, tetragonal, and others. , Among them, α-Bi 2 O 3 , with a band gap of 2.8 eV, serves as a suitable photocatalyst with enhanced visible light responsiveness compared to standard wide band gap materials like TiO 2 . Due to its temperature dependence, Bi 2 O 3 with high crystallinity is typically synthesized through calcination. , Nowadays, researchers are paying attention to MOFs-derived Bi 2 O 3 , which is fabricated by calcination using Bi-based MOFs as precursors.…”

Section: Introductionmentioning

confidence: 99%

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

Cheng,

Xiao,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Photocatalysis is extensively implemented in organic pollutant degradation, and the critical point is to develop outstanding and stable photocatalysts. Herein, the synthesis of coral reef-like α-Bi 2 O 3 /BiOBr heterostructure photocatalysts involves the in situ growth of BiOBr nanosheets onto α-Bi 2 O 3 , with the latter derived through calcination utilizing a bismuthbased metal−organic framework (CAU-17) as the precursor. Under simulated sunlight, the 20% α-Bi 2 O 3 /BiOBr heterojunction degraded nearly 97.7% of RhB in 60 min, while pure α-Bi 2 O 3 and BiOBr nanosheets degraded only 7.8 and 65.3%, respectively. Furthermore, the 20% α-Bi 2 O 3 /BiOBr nanocomposite exhibited superior recycling stability, degrading 86.6% RhB after four cyclic experiments. This is attributed to the fact that the nanoscale α-Bi 2 O 3 material obtained by calcination can retain the exoteric diffusion channels of CAU-17, making α-Bi 2 O 3 /BiOBr heterojunctions have an enormous specific surface area, providing more adsorption sites and promoting their photocatalytic capacity. Free radical capture tests and electron paramagnetic resonance measurements indicated that h + and • O 2 − were the primary active substances during photodegradation. On the basis of that, a feasible photodegradation mechanism of type II α-Bi 2 O 3 /BiOBr heterojunctions was proposed. This study opens up the possibility of designing type II heterojunctions with MOFs as precursors for dye degradation.

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Photoluminescence and photocatalytic properties of novel Bi2O3:Sm3+ nanophosphor

Cited by 15 publications

References 35 publications

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Degradation of formaldehyde aqueous solution by Bi based catalyst and its activity evaluation

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

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Photoluminescence and photocatalytic properties of novel Bi2O3:Sm3+ nanophosphor

Cited by 15 publications

References 35 publications

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Degradation of formaldehyde aqueous solution by Bi based catalyst and its activity evaluation

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi2O3 for Photodegradation of Rhodamine B

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Product

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Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B