Optical properties and Judd–Ofelt analysis of Sm ions in Lanthanum trifluoride nanocrystals

Ha, Hoang Manh; Hoa, Tran Thi Quynh; Vu, Le Van; Long, Nguyen Ngoc

doi:10.1007/s10854-016-5603-1

Cited by 11 publications

(3 citation statements)

References 32 publications

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“…As seen from figure, undoped LaF 3 sample does not emit light, whereas LaF 3 :Sm 3+ samples exhibit emission spectra with four dominant peaks at 560, 593, 639, and 705 nm corresponding to the emission transitions from the 4 G 5/2 excited state to the 6 H 5/2 , 6 H 7/2 , 6 H 9/2 and 6 H 11/2 states of the Sm 3+ ion, respectively. As can be seen from the results of Judd-Ofelt analysis [14], the two transitions 4 G 5/2 → 6 H 9/2 and 6 H 11/2 are purely electric-dipole (ED) transitions whereas the other two transitions 4 G 5/2 → 6 H 5/2 and 6 H 7/2 contain contributions of both the ED and magnetic-dipole (MD). Additionally, it is found from the inset of Figure 3 that the PL intensity achieved its maximal value for the samples doped with 1 mol% Sm 3+ .…”

Section: Photoluminescencementioning

confidence: 99%

“…In our previous work [14], we studied absorption properties and used Judd-Ofelt (J-O) theory for investigating optical properties of Sm 3+ -doped LaF 3 (LaF 3 :Sm 3+ ) nanocrystals fabricated by hydrothermal method. In this report, we center our attention on the photoluminescence (PL) and photoluminescence excitation (PLE) properties of the LaF 3 :Sm 3+ nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

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Photoluminescence and Energy Transfer Between Sm 3+ Ions in LaF3 Nanocrystals Prepared by Hydrothermal Method

Ha¹

2016

IJMSA

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The aim of this research is to study photoluminescent properties and particularly energy transfer between Sm 3+ ions in LaF 3 nanocrystals because the energy transfer process has a significant effect on the luminescence efficiency and lifetime. Sm 3+-doped LaF 3 nanocrystals with 0.1, 0.2, 0.3, 1.0, 2.0, 3.0, 4.0 and 5.0 mol% Sm 3+ have been prepared by hydrothermal method. The obtained nanocrystals were characterized by X-ray diffraction, transmission electron microscopy, photoluminescence and luminescence decay measurement. The results showed that the LaF 3 :Sm 3+ nanocrystals possess hexagonal structure with 3 1 space group. The room temperature photoluminescence and photoluminescence excitation spectra of LaF 3 :Sm 3+ were investigated in detail and interpreted by optical intra-configurational f-f transitions within Sm 3+ ions. When Sm 3+ ion concentration in the nanocrystals is increased, the excitation energy is transferred from the "bulk" Sm 3+ ions to the surface Sm 3+ ions followed by non-radiative recombination at centers at the surface of the nanocrystals. The photoluminescence decay curves of 593 nm peak in the LaF 3 nanocrystals doped with 1.0-5.0 mol% Sm 3+ were best fitted to the Inokuti-Hirayama model with the dominant dipole-quadrupole interaction (S = 8). The values of fitting parameters for the energy transfer process were determined.

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Section: Photoluminescencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoluminescence and Energy Transfer Between Sm 3+ Ions in LaF3 Nanocrystals Prepared by Hydrothermal Method

Ha¹

2016

IJMSA

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“…The bands are attributable to Sm 3+ intra-4f 5 transitions, corresponding to excitation from the lowest 6 H5/2 ground state to the different Sm 3+ excited states [362]. The transitions were correlated to the corresponding excitation peaks following the literature [364], as illustrated in Figure 6.16 (c). The bands are within the range of those previously observed in the Ce,Sm co-doped NaMgF3 nanoparticles studied in section 5.2 and previously reported in the NaMgF3:Sm bulk compound [21].…”

Section: Referencesmentioning

confidence: 85%

The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

Nalumaga¹

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NaMgF3 is a host material that has demonstrated luminescent properties suitable for radiation dose measurements when doped with lanthanide (Ln) ions. NaMgF3 has a response to ionising radiation similar to that of tissue, and hence it has potential application in radiotherapy where a high level of accuracy is required. This thesis focused on investigations into the suitability of NaMgF3 nanoparticles for radiation dose measurements. Nanoparticles display advantages that can be exploited to increase spatial resolution in two-dimensional dosimetry. Additionally, nanoparticles exhibit new and different distributions of optically active traps, and their luminescence can be sensitised to increase the signal to noise. Hence, this thesis presents results obtained from the synthesis and characterisation of Ln-doped NaMgF3 nanoparticles. The nanoparticles were synthesised via the hydrothermal, reverse micelle and thermolysis techniques. Structural studies were carried out, followed by investigations on the effect of X-ray irradiation on the luminescent properties of the nanoparticles. It was observed that compared to the bulk materials, the nanoparticles exhibited increased oxygen (O2-)-related defect luminescence and favoured substitution of trivalent ions over the divalent ions. The behaviour was attributed to the stability of trivalent ions in aqueous solutions during nanoparticle synthesis, which encouraged increased incorporation of O2--related defects to create charge neutrality. O2--related defects allowed for O2- → Yb3+ charge transfer process, hence Yb3+ emission in the infrared region. X-ray stimulation resulted in Yb3+ → Yb2+ radiophotoluminescence (RPL), but the increase in Yb-dopant concentration revealed no significant effect on the structural and luminescent properties. Most of the studied materials exhibited multiple luminescence properties for monitoring radiation doses, which would increase the dose accuracy. Ce-doped nanoparticles exhibited the first reported optically stimulated luminescence (OSL) in Ln-doped near tissue-equivalent NaMgF3 nanoparticles suitable for total radiation measurements. OSL occurred through a series of processes, including the creation of F-centres through X-ray irradiation and optical stimulation to release electrons that recombined with holes trapped at Ce4+ sites, followed by Ce3+ emission. In addition, the Ce3+ → Ce4+ RPL effect suitable for cumulative radiation monitoring was observed from isolated and aggregated Ce3+ sites in the Ce-doped nanoparticles, providing an additional method to increase dose accuracy. Furthermore, the Ce,Sm co-doped NaMgF3 nanoparticles demonstrated suitability for real-time and cumulative radiation dose monitoring via Sm radioluminescence after a priming dose and multiple Ce3+ → Ce4+, Sm3+ → Sm2+, and O2- → O- RPL signals through which cumulative radiation doses can be determined. Finally, the applicability of singly doped oleic acid-capped NaMgF3:Eu and NaMgF3:Sm nanoparticles for radiation monitoring via the Eu3+ → Eu2+ and Sm3+ → Sm2+ RPL effects were demonstrated. The studies were followed by investigations of the sensitisation of Eu3+ and Sm3+ luminescence signals using 2-thenoyltrifluoroacetone (TTFA). The first successful sensitisation of NaMgF3 nanoparticles was demonstrated through remarkable TTFA → Eu3+ energy transfer. However, minimal TTFA → Sm3+ sensitisation was observed, attributable to a non-optimal energy difference between the TTFA triplet state and the Sm3+ resonance energy level, encouraging back energy transfer. TTFA → O2- sensitisation was additionally observed in the NaMgF3:Sm nanoparticles. Furthermore, enhancement of Sm3+ luminescence was additionally demonstrated in the Ce,Sm co-doped nanoparticles via energy transfer from the Ce3+ fully allowed 4f → 5d transitions. The studies resulted in a wealth of information, and where possible, detailed schematic models are presented to explain the observations, which will guide future research. Ultimately, nanoparticles display luminescent properties suitable for dosimetry applications, and the results encouraged further research into the application of nanoparticles as dosimeter materials.

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LaF3: Pr3+ hollow hexagon nanostructures via green and eco-friendly synthesis and their photoluminescence properties

Fang

Fei

et al. 2018

J Mater Sci

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Optical properties and Judd–Ofelt analysis of Sm ions in Lanthanum trifluoride nanocrystals

Cited by 11 publications

References 32 publications

Photoluminescence and Energy Transfer Between Sm <sup>3+</sup> Ions in LaF<sub>3</sub> Nanocrystals Prepared by Hydrothermal Method

Photoluminescence and Energy Transfer Between Sm <sup>3+</sup> Ions in LaF<sub>3</sub> Nanocrystals Prepared by Hydrothermal Method

The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

LaF3: Pr3+ hollow hexagon nanostructures via green and eco-friendly synthesis and their photoluminescence properties

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Optical properties and Judd–Ofelt analysis of Sm ions in Lanthanum trifluoride nanocrystals

Cited by 11 publications

References 32 publications

Photoluminescence and Energy Transfer Between Sm &lt;sup&gt;3+&lt;/sup&gt; Ions in LaF&lt;sub&gt;3&lt;/sub&gt; Nanocrystals Prepared by Hydrothermal Method

Photoluminescence and Energy Transfer Between Sm &lt;sup&gt;3+&lt;/sup&gt; Ions in LaF&lt;sub&gt;3&lt;/sub&gt; Nanocrystals Prepared by Hydrothermal Method

The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

LaF3: Pr3+ hollow hexagon nanostructures via green and eco-friendly synthesis and their photoluminescence properties

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Photoluminescence and Energy Transfer Between Sm <sup>3+</sup> Ions in LaF<sub>3</sub> Nanocrystals Prepared by Hydrothermal Method

Photoluminescence and Energy Transfer Between Sm <sup>3+</sup> Ions in LaF<sub>3</sub> Nanocrystals Prepared by Hydrothermal Method