Second harmonic generation and Yb3+ cooperative emission used as structural probes in size-driven cubic–tetragonal phase transition in BaTiO3 sol–gel nanocrystals

Amami, J.; Hreniak, D.; Guyot, Y.; Pązik, Robert; Goutaudier, C.; Boulon, G.; Ayadi, Mohamed; Stręk, W.

doi:10.1016/j.jlumin.2006.01.021

Cited by 22 publications

(13 citation statements)

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“…5 D 4 which is a multiphonon assisted transfer process involving the excited Tb 3+ ion and its neighbors. Therefore, the radiative emission probability of 5 D 3 state is low and most of the excited electrons in 5 In the 1970s, Reut and Ryskin reported on the formation of a metal-to-metal charge transfer state of the type Pr 4+ -Mo 5+ and Pr 4+ -W 5+ that contributes to quench the emitting 3 P 0 level of Pr 3+ ions in scheelite type crystals A II M VI O 4 (A II = Cd, Ca, Pb, Sr, Ba; M VI = Mo, W) [32]. This behavior is also observed in Tb 3+ .…”

Section: Resultsmentioning

confidence: 99%

“…Currently, trivalent rare-earth ions (RE 3+ ) activated inorganic compounds have attracted considerable attention due to their potential applications in light-emitting diodes (LEDs), fluorescent lamps, flat plane displays, solid state laser and high energy radiation detectors [1][2][3][4][5]. Among these applications, white lightemitting diodes (w-LEDs) have particularly attracted great interest because of their advantages of long lifetime, low energy consumption, high light output yield, and environmental-friendly characteristics [6].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

Liu

Xiang

Chen

et al. 2012

Materials Research Bulletin

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

Liu

Xiang

Chen

et al. 2012

Materials Research Bulletin

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“…[6] For instance, a cubic-to-tetragonal phase transition was evidenced in Yb-doped BaTiO 3 . [7] Due to the small separation between Stark levels, a small increase in the temperature results in the population of the upper energy levels. This increases the number of transitions observed on emission and absorption spectra and consequently complicates their assignments.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals

et al. 2011

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Synthesized powders and grown single crystals of nominal compositions Li(6)Ln(BO(3))(3):Yb(3+) (Ln=Y, Gd) were investigated by means of powder and single-crystal X-ray diffraction (XRD), as well as optical near-IR spectroscopy in conjunction with electron paramagnetic resonance (EPR) spectroscopy. The appearance of two distinct zero-phonon lines suggests the existence of two kinds of Yb(3+) ions in the single crystals. The XRD results exclude the possibility of a phase transition occurring between room and low temperatures. EPR spectra of single crystals show the presence of both isolated ions and pairs of ytterbium ions substituted for Y(3+). A strong temperature dependence of the intensity of Yb-Yb pairs resonance lines coincides with temperature dependence of emission peak at 978 nm, confirming a common origin of the defect giving rise to these spectra. Calculated from EPR spectra, the distance between pairs of Yb(3+) is in good agreement with crystallographic ones: R=3.856 Å, R(cryst) =3.849 Å.

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“…At a higher doping concentration, a morphology and texture modification occurred, showing aggregates of 500 nm in size, which could be associated with the formation of secondary phases as the pyrochlore Yb 2 Ti 2 O 7 , as was reported for Yb 3þ doped BaTiO 3 powders with a concentration equal to or more than 5% at. 19) …”

Section: Xrd Studies and Morphologymentioning

confidence: 99%

Structural and Optical Characteristics of BaTiO<SUB>3</SUB>:Yb<SUP>3+</SUP> Powders

Murillo¹,

Romo²,

Hernández³

et al. 2009

Mater. Trans.

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Yb3þ doped Barium Titanate powders were prepared by the sol-gel method in order to study their structural and luminescent properties. These powders have potential to be used to prepare films for luminescent screens. The synthesized powders were obtained at 2, 4 and 8% mol Yb 3þ doped BaTiO 3 . In order to determine organic compound decomposition, weight loss, and establish the crystallization process, we performed TGA and DTA analyses. The powders were also thermally treated at temperatures ranging from 700 to 1200 C in order to study the structure evolution. Pure doped BaTiO 3 powders were carefully studied by X-ray diffraction (XRD). Observations of the powders using scanning electron microscopy (SEM) were done in order to correlate the grain size with the luminescent properties. A comparative study of the spectroscopy properties constituted by emission, absorption spectra, and fluorescence decay measurements using NIR excitation were done. The Yb 3þ ions pairs emission was measured in the green region at about 500 nm when pumping at 940 nm.

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Second harmonic generation and Yb3+ cooperative emission used as structural probes in size-driven cubic–tetragonal phase transition in BaTiO3 sol–gel nanocrystals

Cited by 22 publications

References 8 publications

Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals

Structural and Optical Characteristics of BaTiO<SUB>3</SUB>:Yb<SUP>3+</SUP> Powders

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Second harmonic generation and Yb3+ cooperative emission used as structural probes in size-driven cubic–tetragonal phase transition in BaTiO3 sol–gel nanocrystals

Cited by 22 publications

References 8 publications

Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li6Ln(BO3)3:Yb3+ (Ln=Gd, Y) Borate Single Crystals

Structural and Optical Characteristics of BaTiO<SUB>3</SUB>:Yb<SUP>3+</SUP> Powders

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Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Gd, Y) Borate Single Crystals