Effects of beta particles irradiation and thermal treatment on the traps levels structure and luminescent properties of BaMoO4 phosphor

Künzel, Roseli; Latini, Renato Mazin; Umisedo, Nancy K.; Yoshimura, Elisabeth Mateus; Okuno, Emico; Courrol, Lilia Coronato; Marques, Ana Paula de Azevedo

doi:10.1016/j.ceramint.2019.01.087

Cited by 8 publications

(13 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…BaMoO 4 is a compound that belongs to transition-metal oxides with a scheelite-type structure. This phase is an important material and has useful applications in different scientific and technical areas as photocatalysts [1], anode materials for lithium ion batteries (LIB) and sodium ion batteries (SIB) [2], solid-state lasers [3], phosphors [4,5] and host matrices for doping with Re 3+ ions [5][6][7]. BaMoO 4 possesses good thermal and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles

Gancheva,

Iordanova,

Koseva

et al. 2023

Materials

View full text Add to dashboard Cite

BaMoO4 was obtained via facile mechanochemical synthesis at room temperature and a solid-state reaction. An evaluation of the phase composition and structural and optical properties of BaMoO4 was conducted. The influence of different milling speeds on the preparation of BaMoO4 was explored. A shorter reaction time for the phase formation of BaMoO4 was achieved using a milling speed of 850 rpm. A milling speed of 500 rpm led to partial amorphization of the initial reagents and to prolongation of the synthesis time of up to 3 h of milling time. Solid-state synthesis was performed via heat treatment at 900 °C for 15 h. X-ray diffraction analysis (XRD), infrared (IR) and UV diffuse reflectance (UV-Vis) and photoluminescence (PL) spectroscopy were carried out to characterize the samples. Independently of the method of preparation, the obtained samples had tetragonal symmetry. The average crystallite sizes of all samples, calculated using Scherrer’s formula, were in the range of 240 to 1540 Å. IR spectroscopy showed that more distorted structural MoO4 units were formed when the compound was synthesized via a solid-state reaction. The optical band gap energy of the obtained materials was found to decrease from 4.50 to 4.30 eV with increasing crystallite sizes. Green- and blue-light emissions were observed for BaMoO4 phases under excitation wavelengths of 330 and 488 nm. It was established that the intensity of the PL peaks depends on two factors: the symmetry of MoO4 units and the crystallite sizes.

show abstract

Section: Introductionmentioning

confidence: 99%

“…BaMoO 4 possesses good thermal and chemical stability. It is a semiconductor material with wide optical band gap and high luminescence at room temperature [1,[3][4][5][6][7][8][9]. In the scheelite structure, Ba ions are coordinated with eight oxygen atoms, and Mo ions are connected to four oxygen atoms, forming MoO 4 groups [10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles

Gancheva,

Iordanova,

Koseva

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…[32][33][34] These materials can also display some intrinsic defects resulting from possible fluctuations in thermal conditions during synthesis as well as from the presence of non-intentional contaminants. 35,36 The density and distributions of intrinsic defects are closely related to the synthesis methodology. 37,38 In this relation, the hydrothermal treatment is a methodology widely used to design inorganic materials with high-quality nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…Also, these disorders occurs as a result of ion electrical charge difference, which generates cationic vacancies around the doping sites 32‐34 . These materials can also display some intrinsic defects resulting from possible fluctuations in thermal conditions during synthesis as well as from the presence of non‐intentional contaminants 35,36 . The density and distributions of intrinsic defects are closely related to the synthesis methodology 37,38 .…”

Section: Introductionmentioning

confidence: 99%

The role of the Tm³⁺ concentration on CaMoO₄ properties processed by microwave hydrothermal under stirring condition

Feldhaus

Künzel²,

et al. 2021

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

The compounds based on calcium molybdate (CaMoO 4 ) are the subject of extensive research due to their excellent optical properties and a broad range of potential technological applications. In this work, we report a systematic study of CaMoO 4 :Tm 3+ phosphors synthesized by coprecipitation and processed in a microwave-hydrothermal system at low temperature (100°C) and stirring. The effect of the Tm 3+ doping content (0%-12%) is studied in full detail to understand their role in the CaMoO 4 :Tm 3+ morphological, structural, and luminescent properties. The X-ray diffraction, Raman, and Fourier Transform Infrared spectroscopic techniques revealed that all the prepared powders have a tetragonal crystal structure with a distinct density of cation vacancies and structural disorders. The band gap remains almost constant for doping levels lower than 8%, but it narrows strongly for powders doped with 12% Tm 3+ ions.The designed phosphors have shown two emission bands in which intensity depends on the Tm 3+ ions doping level. For doping levels lower than 2%, the photoluminescence profile displays a broad emission band peaking at 543 nm (green). For concentrations higher than 4%, the band centered at 543 nm decreases in intensity and the near-infrared emission band at around 800 nm, assigned to 3 F 3 , 3 H 4 → 3 H 6 transitions from Tm 3+ ion, become more intense. The outcomes of this work reveal that appropriated Tm 3+ ions doping levels can be applied to suppress the PL emission in the visible range and improve that in the near-infrared region in CaMoO 4 -based materials. K E Y W O R D Sceramic matrix composites, microwaves, optical materials/properties, photoluminescence, rare earths How to cite this article: Feldhaus CMS, Künzel R, Li MS, Marques APdA. The role of the Tm 3+ concentration on CaMoO 4 properties processed by microwave hydrothermal under stirring condition.

show abstract

“…Thermoluminescence is a useful phenomenon to characterize traps and lattice defects in broad band gap materials in which light is radiated from heated materials due to the release of trapped stored electrons . The released electrons recombine at luminescence centres, giving out a glow.…”

Section: Introductionmentioning

confidence: 99%

Study of thermoluminescence in turtle shell fossils using radiation dosimetry

Ovhal

Samant

Dhoble³

et al. 2019

Luminescence

View full text Add to dashboard Cite

The present study describes for the first time thermoluminescence (TL) characterization of turtle shell. A fossil shell was collected from the Dongargaon area in the Chandrapur district of Maharashtra, India. TL was recorded and a comparative study of TL for the above material was performed to understand the special TL characteristics of the shell. The shell was irradiated with 60 Co γ-radiation to study its TL properties. The sample displayed two good TL peaks at 135°C and 255°C. A linear dose-response curve for the irradiated sample was produced for the dose range 0.79-28.5 kGy; this sample of turtle shell (fossil) may be useful as a high dose dosimetry phosphor in this range. This geological sample was further characterized using X-ray diffraction to confirm its phase structure and by scanning electron microscopy , Fourier transform infrared and wavelength dispersive X-ray fluorescence spectroscopy to determine morphology, vibration, and elemental composition as ppm or percentage of the sample, respectively. Kinetic parameters of the TL glow peak were calculated using three different methods.

show abstract

Effects of beta particles irradiation and thermal treatment on the traps levels structure and luminescent properties of BaMoO4 phosphor

Cited by 8 publications

References 40 publications

Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles

Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles

The role of the Tm³⁺ concentration on CaMoO₄ properties processed by microwave hydrothermal under stirring condition

Study of thermoluminescence in turtle shell fossils using radiation dosimetry

Contact Info

Product

Resources

About

Effects of beta particles irradiation and thermal treatment on the traps levels structure and luminescent properties of BaMoO4 phosphor

Cited by 8 publications

References 40 publications

Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles

Synthesis and Luminescent Properties of Barium Molybdate Nanoparticles

The role of the Tm3+ concentration on CaMoO4 properties processed by microwave hydrothermal under stirring condition

Study of thermoluminescence in turtle shell fossils using radiation dosimetry

Contact Info

Product

Resources

About

The role of the Tm³⁺ concentration on CaMoO₄ properties processed by microwave hydrothermal under stirring condition