Emission properties of Ln (Eu, Tb, Dy, Er)-doped Y2O3 nanoparticles synthesized by surfactant-assembly and their applications in visible color-tuning

Akita, Yukihiko; Harada, Takashi; Sasai, Ryo; Tomita, Koji; Nishiyama, Katsura

doi:10.1016/j.jphotochem.2014.11.017

Cited by 17 publications

(19 citation statements)

References 36 publications

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“…3+ is a well known lanthanide ion used for a wide variety of optical applications [22][23][24][25][26][27][28][29][30][34][35][36][37][38][39][40][41][42], with a common application being two-color thermometry (TCT) [22][23][24][25][26][27][28][29][30]34]. TCT using Dy relies on two closely spaced Dy energy levels ( 4 I 15/2 and 4 F 9/2 ) to act as a probe of temperature.…”

Section: Dymentioning

confidence: 99%

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

2017

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We develop a two-color thermometry (TCT) phosphor based on [Y1−xDyx(acetylacetonate)3(1,10-phenanthroline)] ([Y1−xDyx(acac)3(phen)]) molecular crystals for use in heterogeneous materials. We characterize the optical properties of [Y1−xDyx(acac)3(phen)] crystals at different temperatures and Dy concentrations and find that the emission is strongly quenched by increasing temperature and concentration. We also observe a broad background emission (due to the ligands) and find that [Y1−xDyx(acac)3(phen)] photodegrades under 355 nm illumination with the photodegradation resulting in decreased luminescence intensity. However, while decreasing the overall emission intensity, photodegradation is not found to influence the integrated intensity ratio of the 4 I 15/2 → 6 H 15/2 and 4 F 9/2 → 6 H 15/2 transitions. This ratio allows us to compute the temperature of the complex Based on the temperature dependence of these ratios we calculate that [Y1−xDyx(acac)3(phen)] has a maximum sensitivity of 1.5 % K −1 and our TCT system has a minimum temperature resolution of 1.8 K. Finally, we demonstrate the use of [Y1−xDyx(acac)3(phen)] as a TCT phosphor by determining a dynamic temperature profile using the emission from [Y1−xDyx(acac)3(phen)].

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Section: Dymentioning

confidence: 99%

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

2017

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“…The synthetic routine for Ln@Y 2 O 3 with d av = 500 nm using surfactant-assemblyin aqueous solution is reported in our previous publication [9]. A surfactant possessing a chain of length N is abbreviated as "SNS".…”

Section: 1materialsmentioning

confidence: 99%

“…Another advantage of Ln 3+ emitters is that their bandwidth in the emission spectra is narrow(45 cm -1 at full width of half maximum (fwhm) for the Eu 3+5 D 0 -5 F 2 transition, for example [9])than those ofquantum dots and ZnO particles (ca. 3,000-7,000 cm -1 , depending on the environment [3,5].…”

Section: Introductionmentioning

confidence: 99%

“…In line with such a strategy, we recently synthesized Ln 3+ -doped Y 2 O 3 particles, which are hereafter denoted as "Ln@Y 2 O 3 " [9]. When the base material, Y 2 O 3 , was excited, a characteristic emission originating fromLn 3+ was observed as a result of energy transfer.…”

Section: Introductionmentioning

confidence: 99%

“…Employing this protocol,an average diameter (d av )of 500 nm was obtained for Ln@Y 2 O 3 regardless of the dopant type [9]. For further application to biomarkers, however,d av should be reduced down to tens of nanometers to achieve efficient spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

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Possible size control and emission characteristics of Eu3+–doped Y2O3 nanoparticles synthesized by surfactant-assembly

Akita

Harada

Sasai

et al. 2016

Chemical Physics Letters

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Yttrium oxide nanoparticles doped with 2.0wt% Eu(Eu@Y 2 O 3)were synthesized via thesurfactant-assembly method. The average diameter of Eu@Y 2 O 3 (d av) depends on the alkyl chain number (N) of the sodium alkyl sulfates employedas surfactants. Using surfactants with N = 8, 10, and 12, Eu@Y 2 O 3 with d av = 35, 200, and 500 nm, respectively were obtained. Such changes in d av are ascribed to the difference in the micelle aggregation numbers, supporting the use ofrare-earthions in the assembly. TheEu@Y 2 O 3 particles synthesized presently emitted through Eu 3+ transitionsunder UV excitation of Y 2 O 3 , making them applicable to nanoemitters.

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Production, characterization, and photocatalytic properties of Eu:Y₂O₃ nanopowders

Ünal

Alp

Kazmanlı

2022

J Chinese Chemical Soc

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Eu:Y2O3 nanophosphors (NPs) with different Eu concentrations (3, 5, and 7 at%) were successfully synthesized via the sol–gel method. All synthesized powders had a cubic bixbyite‐type crystal structure with space group Ia‐3. It was observed they had agglomerated sphere‐like morphologies. In addition, a neck formation between the particles, which was the result of the sintering effect at the increasing calcination temperature, was also observed by scanning electron microscopy analysis. Raman and X‐ray photoelectron spectroscopy (XPS) analyses confirmed that the Eu dopant entered into the Y2O3 host. The XPS peak positions shifted to relatively higher binding energy values with increasing dopant concentration and calcination temperature. Increasing Eu dopant concentration in the host structure also increased the 3+ valence ions. The band gap values of the NPs varied between 4.30 and 4.54 eV. The powders doped with 5 at% Eu was active as photocatalysts and the powders that were synthesized at 800°C exhibited highly photocatalytic activity.

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Emission properties of Ln (Eu, Tb, Dy, Er)-doped Y2O3 nanoparticles synthesized by surfactant-assembly and their applications in visible color-tuning

Cited by 17 publications

References 36 publications

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Possible size control and emission characteristics of Eu3+–doped Y2O3 nanoparticles synthesized by surfactant-assembly

Production, characterization, and photocatalytic properties of Eu:Y₂O₃ nanopowders

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Emission properties of Ln (Eu, Tb, Dy, Er)-doped Y2O3 nanoparticles synthesized by surfactant-assembly and their applications in visible color-tuning

Cited by 17 publications

References 36 publications

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Possible size control and emission characteristics of Eu3+–doped Y2O3 nanoparticles synthesized by surfactant-assembly

Production, characterization, and photocatalytic properties of Eu:Y2O3 nanopowders

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Production, characterization, and photocatalytic properties of Eu:Y₂O₃ nanopowders