Order–disorder degree of self-assembled clusters: Influence on photoluminescence emission and morphology of BaxSr1−xTiO3 nanocrystals

Souza, Agda Eunice de; Silva, R. A.; Santos, G. T. A.; Teixeira, Silvio Rainho; Antônio, Selma Gutierrez; Moreira, Mário L.; Volanti, Diogo P.; Longo, Elson

doi:10.1016/j.cplett.2011.08.045

Cited by 9 publications

(8 citation statements)

References 45 publications

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“…Raman spectroscopy has been used to study the structure and symmetry in solids as well as phase transitions in different perovskites [17]. The phenomenon of inelastic light scattering is generally used to investigate the behavioral changes in the local symmetry of ceramics.…”

Section: Ft-raman Spectroscopy Analysismentioning

confidence: 99%

Crystal growth and photoluminescence of europium-doped strontium titanate prepared by a microwave hydrothermal method

Gonçalves¹,

Moura²,

Godinho³

et al. 2015

Ceramics International

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Section: Ft-raman Spectroscopy Analysismentioning

confidence: 99%

Crystal growth and photoluminescence of europium-doped strontium titanate prepared by a microwave hydrothermal method

Gonçalves¹,

Moura²,

Godinho³

et al. 2015

Ceramics International

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“…The scanning electron microscopy image (FE-SEM) of this sample (x¼ 0 -BaTiO 3 ) showed that growth generates nanostructures close to having spherical morphology, whose particle size did not exceed 100 nm. In previous studies [13,14], the growth of BaTiO 3 spherical particles prepared under similar conditions using 6 mol/L KOH as mineralizer was also observed. However, barium carbonate as additional phase was identified and the particle observed by FE-SEM images showed sizes greater than 100 nm.…”

Section: Resultsmentioning

confidence: 67%

Defects or charge transfer: Different possibilities to explain the photoluminescence in crystalline Ba(Zr x Ti 1−x )O 3

Souza

Sasaki

Camacho

et al. 2016

Journal of Luminescence

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In this work, BZT (Ba (Zr x Ti 1 À x)O 3), composite ceramic powder with x ¼0, 0.25, 0.50, 0.75 and 1 (mol) was prepared by the microwave-assisted hydrothermal method. The structural, morphological and optical properties of the compounds were determined by XRD, SEM, Raman, UV-vis and photoluminescence analysis. The results showed that the stability of the BZ phase was strongly influenced by the isomorphic Zr/Ti substitution, and that the BZ sample had the greatest structural order for short and long distances compared to the other. The BZT ceramic composite showed optical behavior also influenced by the concentration of Zr, resulting in a growing photoluminescence emission with increasing Zr ion in the network. The BZ sample showed higher photoluminescent intensity in a region including the entire visible spectrum. Although the effect of photoluminescence in these materials is dependent on the presence of defects, which produce excitons for radiative recombination, in the BZ compound, there might have been other effects causing the intense photoluminescence. In this case, high emission is associated with the a charge transfer between neighboring clusters [ZrO 6 ] in a nanoparticle surface interface, which in turn are joined to form BZ mesocrystals on a micrometer scale. The photoluminescence observed in the BZT compound had a predominantly white color, a feature that gives it high potential for applications in white light-emitting devices.

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“…The PL response is being studied by different researchers, due to the applicability in optics devices. This has already been reported in different materials with a perovskite structure [21][22][23][24][25][26], among them the CTO [27] CCTO [22,[28][29][30][31] and CCTO/CTO [32]. Usually, the PL behavior is attributed to multiphonon processes, i.e., a system in which relaxation occurs through several paths located in states of energy above the valence band and below the conduction band [33].…”

Section: Introductionmentioning

confidence: 75%

“…Photoluminescence (PL) emission is a powerful tool employed to elucidate the properties of different materials with perovskite structure, being closely related to the crystal structure and its corresponding distorted metal-oxygen polyhedrons. In particular, many titanates present structures with lower symmetries which under ambient conditions could derive the rotation or tilting of regular, rigid octahedrons resulting in the presence of distorted TiO 6 clusters [21][22][23]. Although the structure is distorted, the rotation/tilting of the octahedral framework does not disrupt the corner-sharing connectivity.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence behavior on Sr 2+ modified CaCu 3 Ti 4 O 12 based ceramics

Orrego

Cortés

Amoresi

et al. 2018

Ceramics International

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Sr 2+ modified CaSr x Cu 3-x Ti 4 O 12 ceramic powders with x = ranging from 0.00 to 3.00 were prepared by solidstate reaction. The effects of Sr 2+ CCTO powders were evaluated by X-ray diffraction (XRD) with Rietveld refinement revealing a mixture of multiple phases. The Raman spectroscopy analysis pointed out that Sr 2+ addition produces an emission in the blue region, associated to TiO 6 clusters. Optical properties by means of PL analysis showed emission near to blue region for the samples with x = 0.00, x = 0.15, x = 0.30, corresponding to oxygen vacancies. The emission in the violet region is associated to deep defects while emission in the other samples is linked to shallow defects typical of disordered crystalline structures. Less prominent emission in the green region with the increase of Sr 2+ corresponds to less self-trapped charges, less interaction between electron and hole, and donor-acceptor recombination.

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Order–disorder degree of self-assembled clusters: Influence on photoluminescence emission and morphology of BaxSr1−xTiO3 nanocrystals

Cited by 9 publications

References 45 publications

Crystal growth and photoluminescence of europium-doped strontium titanate prepared by a microwave hydrothermal method

Crystal growth and photoluminescence of europium-doped strontium titanate prepared by a microwave hydrothermal method

Defects or charge transfer: Different possibilities to explain the photoluminescence in crystalline Ba(Zr x Ti 1−x )O 3

Photoluminescence behavior on Sr 2+ modified CaCu 3 Ti 4 O 12 based ceramics

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