Europium-doped calcium titanate: Optical and structural evaluations

Mazzo, Tatiana Martelli; Pinatti, Ivo M.; Macário, Leilane R.; Avansi, Waldir; Moreira, Mário L.; Rosa, Ieda L. V.; Mastelaro, Valmor Roberto; Varela, José Arana; Longo, Elson

doi:10.1016/j.jallcom.2013.08.174

Cited by 16 publications

(8 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the infrared emission is a lower energetic emission and can be related to deeper defects in the band gap region which originate due to the presence of a larger concentration of the [TiO 5 …”

Section: Resultsmentioning

confidence: 99%

“…Perovskite oxides are a fascinating class of multifunctional inorganic materials that have attracted much attention in recent years [1][2][3][4][5][6]. Perovskite structures have the general formula ABO 3 , where the divalent metal (A) is a network modifier and tetravalent metal sites (B) are network formers for these structures [2].…”

Section: Introductionmentioning

confidence: 99%

“…The Perovskite material ABO 3 structure can adopt five phases, cubic, tetragonal, orthorhombic, trigonal, and monoclinic polymorphs depending on the tilting and rotation of the [BO 6 ] polyhedral clusters in the lattice [3]. In this context, considerable effort has been devoted to the production of perovskite oxide materials with a large variety of morphologies and sizes, due to their high potential for use in lightemitting diodes, photocatalysts, sensors, microwave dielectrics, and photovoltaic applications [4][5][6][7]. Understanding the relationship between the structural and electronic order-disorder effects in the crystalline materials is crucial in designing novel materials with tunable physical and chemical properties [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the photoluminescence (PL) properties are an important quantum optical phenomenon and are one of the most powerful methods for studying the order-disorder effects in semiconductors [8,9]. The doping process in semiconductors often causes significant alterations in the structural and electronic properties of these materials, and is the most promising strategy to further enhance their properties and applications in materials science [5,6,[15][16][17]. However, few studies have been reported on near-infrared (NIR) emissions for such particles [14].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A large red-shift in the photoluminescence emission of Mg 1−x Sr x TiO 3

Nakata

Mazzo

Casali

et al. 2015

Chemical Physics Letters

Self Cite

View full text Add to dashboard Cite

a b s t r a c tIn this letter, we report a detailed study of the influence of the synthesis and the optical properties of Sr-doped MgTO 3 powders synthesized via a polymeric precursor method. Our findings explain the shift in PL behavior from blue to near-infrared (NIR) emission, which is caused by different concentrations of deep and shallow defects in the samples and thus enables the design of differently colored materials. Additionally, the present results provide useful insights into designing a new series of NIR-emitting materials that have potential applications in emerging technologies ranging from optoelectronics to the biomedical field.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A large red-shift in the photoluminescence emission of Mg 1−x Sr x TiO 3

Nakata

Mazzo

Casali

et al. 2015

Chemical Physics Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…The excess of positive charge can be compensated by intertitals defects, when Ti 4þ sites are substituted by Al 3þ ions, improving its optical properties. Mazzo et al [39] also noticed an improvement in local order-disorder degree by creation of cations or oxygen vacancies with substitution of Eu 3þ ions in both A and B sites of CaTiO 3 matrix. This factor also provided significant changes in local order-disorder degree around Ca and Ti clusters.…”

Section: Micro-raman (Mr) Spectroscopy Analysismentioning

confidence: 93%

Investigation of structural and optical properties of CaTiO3 powders doped with Mg2+ and Eu3+ ions

Oliveira

Savioli

Moura

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

a b s t r a c tIn this work, CaTiO 3 powders doped with Mg 2þ ions and CaTiO 3 powders co-doped with Mg 2þ and Eu 3þ ions were prepared by the polymeric precursor method (PPM). These powders were characterized by different characterization techniques to study the influence of Mg 2þ doping as well as Mg 2þ and Eu 3þ codoping in structural and optical properties of CaTiO 3 perovskite-type structure. The Rietveld refinement and Micro-Raman analyses suggested the substitution Mg 2þ and Eu 3þ ions in the A-site of CaTiO 3 perovskite. The influence of Mg 2þ doping can be detected by the displacement of calcium and oxygen atomic positions when compared to the non-doped CaTiO 3 powder. When Eu 3þ ions are added to the Asite of this perovskite the excess of positive charge can be compensated by the formation of calcium vacancies. Luminescence data showed that Ca 1-x Mg x TiO 3 and Ca 1x Mg x/2 Eu 2y/3 TiO 3 powders are potential materials for fabrication of lighting devices based on near-UV and blue LED using an excitation wavelength of 397 and/or 450 nm.

show abstract