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Bordun, O. M.

doi:10.1023/a:1015311725546

Cited by 20 publications

(20 citation statements)

References 3 publications

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“…The Tauc plots for indirect allowed transitions of the samples are shown in Bi 2 O 3 has the ability to absorb electromagnetic irradiation. The transition states between 6s 2 and 6s6p in Bi 3+ ion lead to the luminescence of Bi 2 O 3 [48,49]. Bordun [48] explains that the excited levels of 6s6p are arranged in a triplet form of 3 P 0 , 3 P 1 and 3 P 2 and a singlet form of 1 P 1 .…”

Section: Resultsmentioning

confidence: 99%

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi₂O₃ and β‐Bi₂O₃ synthesised using microwave combustion

et al. 2023

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In the current study, α‐Bi2O3 and β‐Bi2O3 were synthesised using a one‐step, novel, solid–solid combustion technique. The reaction rate was increased with the use of microwaves (molecular heating) compared to direct or indirect heating. A strong relationship was observed between the fuel, polymorphic structure, shape and optical properties of the synthesised Bi2O3. Photoluminescence studies reveal that two major visible emissions are observed for all samples. The two emissions are distinct with a broad peak in blue and a narrow peak in green. The intensity of the green characteristic emission depends strongly on the heating method used for synthesis and is more intense for microwave‐synthesised samples.

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Section: Resultsmentioning

confidence: 99%

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi₂O₃ and β‐Bi₂O₃ synthesised using microwave combustion

et al. 2023

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“…58 The BOET sample shows a very broad emission from 350 to 650 nm. This broad emission can be associated with the convolution of different contributions from different bismuth oxidation states: in particular, the large emission peak between 350 nm and 500 nm can be attributed to both the intraionic transition of Bi 3+ ions ( 3 P 0 -1 S 0 ), 61 and the 2 P 3/2 -2 P 1/2 transition of Bi 2+ . 61,62 The larger the metallic Bi content (i.e.…”

Section: Resultsmentioning

confidence: 99%

“…This broad emission can be associated with the convolution of different contributions from different bismuth oxidation states: in particular, the large emission peak between 350 nm and 500 nm can be attributed to both the intraionic transition of Bi 3+ ions ( 3 P 0 -1 S 0 ), 61 and the 2 P 3/2 -2 P 1/2 transition of Bi 2+ . 61,62 The larger the metallic Bi content (i.e. the higher the laser fluence) the harder it is to reveal a PL signal, which means that only in a few localized regions the Bi oxide/sub-oxide particles are still present.…”

Section: Resultsmentioning

confidence: 99%

β-Bi₂O₃ reduction by laser irradiation in a liquid environment

D’Angelo

Filice

Miritello

et al. 2018

Phys. Chem. Chem. Phys.

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This study reports the structural and stoichiometric modifications of bismuth oxide nanoparticles in the β phase (β-Bi2O3) by UV pulsed laser irradiation in water or ethanol solutions. Scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance and high-resolution transmission electron microscopy were used to characterize the synthesized nanomaterials. The various analyses demonstrate that the laser irradiation of β-Bi2O3 nanospheres is a green, fast and effective method to produce Bi2O2CO3 nanosheets or metallic Bi nanoparticles depending on the liquid environment used. Bi subcarbonate is obtained by laser irradiation in water, whereas metallic Bi is produced by laser irradiation in ethanol, and in particular the relative amount of metallic Bi is found to depend on the laser fluence. These typologies of materials find application in several fields, such as photocatalytic processes, light filters and environmental sensors.

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“…There are also reports on bismuth ions (Bi 3+ , Bi 2+ ) being used as luminescent activator and also as sensitizers in various host materials. [25][26][27][28][29] The luminescence of bismuth ions usually appears in the visible wavelength region. However nano Bi 2 O 3 generally shows weak emission characteristics that limits its application as a light emitting phosphor.…”

Section: Introductionmentioning

confidence: 99%

Dual function of rare earth doped nano Bi2O3: white light emission and photocatalytic properties

2012

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Undoped Bi(2)O(3) and single and double doped Bi(2)O(3) : M (where M = Tb(3+) and Eu(3+)) nanophosphors were synthesized through a simple sonochemical process and characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), EDS, diffuse reflectance (DRS) and photoluminescence (PL) spectrophotometry. The TEM micrographs show that resultant nanoparticles have a rod-like shape. Energy transfer was observed from host to the dopant ions. Characteristic green emissions from Tb(3+) ions and red emissions from Eu(3+) ions were observed. Interestingly, the Commission International de l'Eclairage (CIE) coordinates of the double doped Bi(2)O(3) : Eu(3+)(0.8%) : Tb(3+)(1.2%) nanorods lie in the white light region of the chromaticity diagram and it has a quantum efficiency of 51%. The undoped Bi(2)O(3) showed a band gap of 3.98 eV which is red shifted to 3.81eV in the case of double doped Bi(2)O(3) : Eu(3+)(0.8%) : Tb(3+)(1.2%) nanorods. The photocatalytic activities of undoped nano Bi(2)O(3) and double doped nano Bi(2)O(3) : Eu(3+)(0.8%) : Tb(3+)(1.2%) were evaluated for the degradation of Rhodamine B under UV irradiation of 310 nm. The results showed that Bi(2)O(3) : Eu(3+)(0.8%) : Tb(3+)(1.2%) had better photocatalytic activity compared to undoped nano Bi(2)O(3). The evolution of CO(2) was realized and these results indicated the continuous mineralization of rhodamine B during the photocatalytic process. Thus double doped Bi(2)O(3) : Eu(3+)(0.8%) : Tb(3+)(1.2%) nanorods can be termed as a bifunctional material exhibiting both photocatalytic properties and white light emission.

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Cited by 20 publications

References 3 publications

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi₂O₃ and β‐Bi₂O₃ synthesised using microwave combustion

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi₂O₃ and β‐Bi₂O₃ synthesised using microwave combustion

β-Bi₂O₃ reduction by laser irradiation in a liquid environment

Dual function of rare earth doped nano Bi2O3: white light emission and photocatalytic properties

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Untitled

Cited by 20 publications

References 3 publications

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi2O3 and β‐Bi2O3 synthesised using microwave combustion

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi2O3 and β‐Bi2O3 synthesised using microwave combustion

β-Bi2O3 reduction by laser irradiation in a liquid environment

Dual function of rare earth doped nano Bi2O3: white light emission and photocatalytic properties

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Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi₂O₃ and β‐Bi₂O₃ synthesised using microwave combustion

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi₂O₃ and β‐Bi₂O₃ synthesised using microwave combustion

β-Bi₂O₃ reduction by laser irradiation in a liquid environment