Structural and optical properties of (Y3+, Tb3+)-codoped sodium bismuth titanate nanoparticles

Jeshurun, Ashok; Irfan, Md.; Behara, Santosh; Bogala, Mallikharjuna Reddy

doi:10.1016/j.mtchem.2021.100476

Cited by 11 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The direct band gap values of the NBT and samarium-modified ceramics were determined to fall within the descending range of 3.01 to 3.12 eV from that of NBT suggesting that the samples exhibit semiconducting properties, shown in table 6. A similar trend was observed by the earlier researchers [14,40,41]. This decrease in Additionally, it may be linked to the microstructural changes brought on by variations in dopant concentration.…”

Section: Optical Studies 321 Ultraviolet-visible (Uv-vis) Reflectance...supporting

confidence: 88%

Samarium-modified NBT ceramics: a comprehensive exploration of cumulative effects

Neeli,

Jaladi,

Sangula

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

In the present report, ceramic specimens of sodium bismuth titanate [Na0.5(Bi1-xSmx)0.5TiO3] were prepared through solid-state reaction method with variations in the dopant concentrations specifically, x = 0.0, 0.1, 0.3, 0.5. The structural, optical, mechanical, and magnetic properties of lead-free NBT ceramics were investigated. The rhombohedral phase with space group R3c was confirmed in all prepared ceramic samples using X-ray diffraction patterns and Rietveld analysis. SEM micrographs and Energy Dispersive X-ray spectroscopy (EDAX) assess the morphology, grain size, overall structure, and stoichiometry of the developed compounds. FTIR spectroscopy was used for characterizing and identifying the functional groups. UV-vis spectroscopy revealed that band gap values decreased as dopant concentration increased, confirming the use of NBT-based perovskite as a photoactive material. PL spectra at room temperature exhibited reddish-orange emission. Colour coordinates and CCT values are in the range of 3483K to 5912K. At a concentration of x=0.3, the materials displayed a high Vickers hardness of 8.20 GPa and exhibited minimal wear with low frictional coefficient values. Ferromagnetic behaviour at room temperature (RTFM) was detected in Sm-modified ceramic samples, as confirmed by the VSM study. The cumulative effect impact of the rare earth dopant cation at the Bi-site of NBT was widespread and demonstrated significant potential for use in optoelectronic devices.

show abstract

Section: Optical Studies 321 Ultraviolet-visible (Uv-vis) Reflectance...supporting

confidence: 88%

Samarium-modified NBT ceramics: a comprehensive exploration of cumulative effects

Neeli,

Jaladi,

Sangula

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…The Y 3+ ions can provide a great enhancement in the luminescence intensity of a phosphor because it has an optically inert character. [24,25] Based on this information, the samples in this study were co-doped with lithium and yttrium separately and jointly. The PL spectra in Figure 7b shows that emission intensity dropped, not enhanced, as co-doping of separately lithium and yttrium or both.…”

Section: Phosphor Powder Synthesismentioning

confidence: 99%

Synthesis and effects of co‐dopants (La³⁺, Sm³⁺, Mn²⁺, Nd³⁺, V⁵⁺, Y³⁺) on photoluminescence of SrAl₂O₄:Dy³⁺ phosphor

Karacaoğlu

2022

Luminescence

View full text Add to dashboard Cite

In this research, the co-dopant effects on photoluminescence (PL) properties of SrAl 2 O 4 :Dy 3+ phosphors were studied. The phosphor powders were prepared with solid state reaction, which is the method that is frequently preferred in SrAl 2 O 4 phosphors and efficient results are obtained in terms of PL properties. X-ray diffraction (XRD) patterns of all co-doped samples were fitted with pdf card#01-034-0379.Fourier-transform infrared (FTIR) analysis supports the phase evolution determined in the XRD results. PL examinations started with the SrAl 2 O 4 that was synthesized with the addition of boron, and then continued with the doped/and co-doped samples. Except for the Sm 3+ co-doped phosphor, PL data of characteristic Dy 3+ transitions were obtained for other lanthanide and metal ion co-dopants. The strongest PL intensity was demonstrated in the SrAl 2 O 4 :Dy 3+ ,V 5+ . SrAl 2 O 4 :Dy 3+ ,Sm 3+ phosphor shows both the Dy 3+ and Sm 3+ ions transition related peaks appeared in the same spectrum. In the continuation of the studies, SrAl 2 O 4 :Dy 3+ ,Sm 3+ and SrAl 2 O 4 : Dy 3+ ,V 5+ powders were immersed in water for 2 h. Regardless of the presence of Dy 3+ luminescent centers and other co-dopants, broadband and intense blue emission peak at 445 nm was recorded which is directly related to newly formed phases by the decomposition of SrAl 2 O 4 .

show abstract

“…Tian Xiao-Xia et al [24] co-substituted Li and Ce ions at a position of A-site of CaBi 2 Nb 2 O 9 ceramic exhibit optimal piezoelectric properties with a piezo coefficient (d 33 ) and curie temperature (T c ) 13.3 pC/N and 960 °C, respectively, are promising candidates for ultra-high temperature applications. J Ashok et al co-doped Y 3+ and Tb 3+ at the Bi-site of Na 0.5 Bi 0.5 TiO 3 enhancing the practical application as a multi-luminescence material in optoelectronic devices such as lightemitting diodes [25]. The double doping at A-site of SBN by K 3+ /Gd 3+ and Ba 3+ /Gd 3+ was studied by previous researchers, Ravi Kumar et al [26,27] and K Sambasiva Rao et al [28].…”

Section: Introductionmentioning

confidence: 99%

Multi-functional attributes of rare earth double doped SrBi₂Nb₂O₉ ferroelectric system

Nagamani¹,

Kiran²,

B³

et al. 2022

Phys. Scr.

View full text Add to dashboard Cite

The ferroelectric perovskite SrBi2Nb2O9 (SBN) material with a low concentration of double doping at the Bi-site of SBN was studied to understand its influence and usefulness in integrated optoelectronic, soft magnetic memory devices and wear-resistant tribomaterials. The aim of the present study is double doping of SBN with a set of rare earth elements Pr3+/Dy3+ (SBPDN), Pr3+/Gd3+ (SBPGN), Pr3+/Sm3+ (SBPSN), and Pr3+/Y3+ (SBPYN) at the Bi-site of SBN to establish the multifunctional ceramic nature pertaining to diverse applications. XRD with Rietveld refinement analysis acknowledged a single-phase orthorhombic structure with an increase in lattice parameters and unsystematic changes in crystallite size. SEM study indicated that the samples possessed non-uniformly distributed needle-shaped grains. The purity of the material and the detection of functional groups were received from the EDS and FTIR spectroscopy. Structural modifications in SBN have been determined based on a diffuse reflectance spectroscopy (DRS) study and therefore the band gap values decrease from 2.98 eV (SBN) to 2.70 eV (double doping) because of the growth of distortion in the structure and pronounced increase in the density of localized states. Photoluminescence (PL) study on double doped SBN material with an excitation wavelength of 320 nm has yielded a novel red emission at 609 nm, that may be useful for white LEDs. The ferromagnetic signature in the studied materials was confirmed from the room temperature VSM study. Noticed mild wear and a low coefficient of friction in the studied materials of SBPDN and SBPSN compared to other studied ceramic samples from mechanical studies. The simultaneous manifestation of optical, magnetic, and mechanical properties by double-doped SBN ceramics keeps the materials as multi-functional candidates for optoelectronic devices, soft magnetic memory devices, and wear-resistant tribomaterials.

show abstract

Structural and optical properties of (Y3+, Tb3+)-codoped sodium bismuth titanate nanoparticles

Cited by 11 publications

References 46 publications

Samarium-modified NBT ceramics: a comprehensive exploration of cumulative effects

Samarium-modified NBT ceramics: a comprehensive exploration of cumulative effects

Synthesis and effects of co‐dopants (La³⁺, Sm³⁺, Mn²⁺, Nd³⁺, V⁵⁺, Y³⁺) on photoluminescence of SrAl₂O₄:Dy³⁺ phosphor

Multi-functional attributes of rare earth double doped SrBi₂Nb₂O₉ ferroelectric system

Contact Info

Product

Resources

About

Structural and optical properties of (Y3+, Tb3+)-codoped sodium bismuth titanate nanoparticles

Cited by 11 publications

References 46 publications

Samarium-modified NBT ceramics: a comprehensive exploration of cumulative effects

Samarium-modified NBT ceramics: a comprehensive exploration of cumulative effects

Synthesis and effects of co‐dopants (La3+, Sm3+, Mn2+, Nd3+, V5+, Y3+) on photoluminescence of SrAl2O4:Dy3+ phosphor

Multi-functional attributes of rare earth double doped SrBi2Nb2O9 ferroelectric system

Contact Info

Product

Resources

About

Synthesis and effects of co‐dopants (La³⁺, Sm³⁺, Mn²⁺, Nd³⁺, V⁵⁺, Y³⁺) on photoluminescence of SrAl₂O₄:Dy³⁺ phosphor

Multi-functional attributes of rare earth double doped SrBi₂Nb₂O₉ ferroelectric system