Luminescence properties of nanocrystalline europium titanate Eu 2 Ti 2 O 7

Mrázek, Jan; Surýnek, Martin; Bakardjieva, Snejana; Buršı́k, Jiřı́; Proboštová, Jana; Kašík, Ivan

doi:10.1016/j.jallcom.2015.05.019

Cited by 22 publications

(13 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The photoluminescence (PL) properties of pyrochlore Eu 2 Ti 2 O 7 have been reported by several authors . To the best of our knowledge, however, no detailed experimental data on its PL excitation (PLE) properties and temperature dependence of the PL properties have been investigated so far.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Unique Photoluminescence Properties of Eu₂Ti₂O₇ and Eu₂TiO₅

2016

View full text Add to dashboard Cite

The europium titania materials, pyrochlore Eu2Ti2O7 and orthorhombic Eu2TiO5, were synthesized from a mixture of Eu2O3 and TiO2 using the solid‐state reaction method. The structural and optical properties of these titania materials were investigated using X‐ray diffraction analysis, photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and diffuse reflectance spectroscopy. Temperature dependence of the PL intensity was measured between T = 20 and 450 K and analyzed on the basis of various theoretical models. A remarkable increase in the PL intensity with increasing T was observed in these titania materials at higher temperatures, above ~140 K, and well explained by a trap/reservoir model. Interestingly, a dramatic decrease in the electric‐dipole emission component relative to the magnetic‐dipole one was observed in Eu2Ti2O7 above T ~ 140 K. The schematic energy‐level diagram for Eu3+ in the Eu2Ti2O7 host was proposed for the sake of a better understanding of the PL and PLE processes in this type of phosphorescent material.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and Unique Photoluminescence Properties of Eu₂Ti₂O₇ and Eu₂TiO₅

2016

View full text Add to dashboard Cite

show abstract

“…In our previous studies, 14,19 we have reported that the crystallization of Eu 2 Ti 2 O 7 powders consists of the homogeneous site-saturated nucleation followed by the three-dimensional growth. In our previous studies, 14,19 we have reported that the crystallization of Eu 2 Ti 2 O 7 powders consists of the homogeneous site-saturated nucleation followed by the three-dimensional growth.…”

Section: Discussionmentioning

confidence: 96%

“…The luminescence properties of the films correlated with their structure and with the size of the nanocrystals. In our previous studies, 14,19 we have reported that the crystallization of Eu 2 Ti 2 O 7 powders consists of the homogeneous site-saturated nucleation followed by the three-dimensional growth. On this assumption, the crystallization can be divided into three steps.…”

Section: Discussionmentioning

confidence: 96%

“…However, the full exploitation of introduced properties in advanced technologies and photonic devices requires the processing of nanocrystalline thin films with precisely tailored structural and optical properties. 13,14 Because the optical properties of materials strongly depend on the structure and morphology of formed nanocrystal, the knowledge about the crystallization and the thermal behavior of the nanocrystals is essential to prepare films with tailored structural and optical properties. Small samples of high-quality thin films of Ho 2 Ti 2 O 7 were prepared by pulse laser deposition.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Thus, the Eu 3+ ions are often used as a luminescent probe to clarify the crystallization behavior and the structure of inorganic materials with better resolution than other conventional X-ray diffraction (XRD) and electron microscopy methods allow for their limited sensitivity. 13,14 Because the optical properties of materials strongly depend on the structure and morphology of formed nanocrystal, the knowledge about the crystallization and the thermal behavior of the nanocrystals is essential to prepare films with tailored structural and optical properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sol‐gel route to nanocrystalline Eu₂Ti₂O₇ films with tailored structural and optical properties

et al. 2019

Self Cite

View full text Add to dashboard Cite

We present a generic sol‐gel approach for the preparation of highly transparent europium titanate Eu2Ti2O7 films with tailored structural and optical properties. The films were prepared by a sol‐gel process and thermally treated in a rapid thermal annealing furnace. We determined the effects of the annealing temperature on structural, morphological, and optical properties of the films. We evaluated film's optical constants. The size of the primary nanocrystals and the film's refractive index were tailored by the annealing temperature. The crystallization of Eu2Ti2O7 started at 800°C and the nanocrystals grew with increasing annealing temperature reaching the size from 20 nm to 100 nm. The energy of nanocrystal growth was 21 ± 3 kJ·mol−1. Increasing nanocrystal size caused the regular growth of the refractive index recorded at 632 nm from 2.07 to 2.17 for the films annealed at 800°C and 1200°C, respectively. These results provide fundamental information about the effects of the structure and the morphology of the films on their optical properties. The presented approach can be extended to other rare earth‐doped titanates and these films can be used as passive protective coatings as well as active materials suitable for photonic and spintronic applications.

show abstract