Synthesis, characterization, and photoluminescence properties of Gd:Tb oxysulfide colloidal particles

Hernández‐Adame, Luis; Méndez-Blas, Antonio; Ruíz-García, Jaime; Vega-Acosta, J. Roger; Medellín‐Rodríguez, F. J.; Palestino, Gabriela

doi:10.1016/j.cej.2014.07.067

Cited by 24 publications

(30 citation statements)

References 38 publications

(54 reference statements)

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“…The most matured technique to synthesize RE 2 O 2 S is solid-state reaction, which has the advantages of high yield and convenience, but high reaction temperature, uncontrollable product morphology, and especially the employment of environmentally harmful sulfur sources are apparent shortcomings [21–23]. Sulfurization of RE 2 O 3 by H 2 S or CS 2 gas at an elevated temperature [24–26] is another frequently used strategy to produce RE 2 O 2 S. Since the methodology for controlled synthesis of RE 2 O 3 is rich and well developed, RE 2 O 2 S with various particle morphologies has thus been produced through the sulfurization route, though the complicated procedures are less feasible for industrial production. Other techniques for RE 2 O 2 S synthesis may include precipitation [27], hydrothermal reaction [28], two-step solution gel polymer thermolysis [29], gelatin-templated synthesis [30], gel thermolysis [31], solvothermal pressure-relief synthesis [32], and combustion [33].…”

Section: Introductionmentioning

confidence: 99%

(La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

Wang

Liu

et al. 2017

Nanoscale Res Lett

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Phase-pure (La0.97RE0.01Yb0.02)2O2S upconversion (UC) nanophosphors (average crystallite size ~ 45 nm; RE=Ho, Er) were annealed from their hydrothermally crystallized layered hydroxyl sulfate precursors in flowing hydrogen at 1200 °C for 1 h, with water vapor as the only exhaust. Under 978-nm laser excitation (up to 2.0 W), the Ho3+-doped phosphor exhibited green (medium), red (weak), and near-infrared (strong) emissions at ~ 546 (5F4 → 5I8), 658 (5F7 → 5I8), and 763 nm (5F4 → 5I7), respectively, and has the stable chromaticity coordinates of about (0.30, 0.66) in the visible-light region (400–700 nm). The Er3+-doped UC phosphor, on the other hand, showed weak green (~ 527/549 nm, 2H11/2,4S3/2 → 4I15/2), weak red (~668/672 nm, 4F9/2 → 4I15/2), and strong near-infrared (~ 807/58 nm, 4I9/2 → 4I15/2) luminescence, whose emission color in the visible region drifted from yellowish-green [(0.36, 0.61)] to green [(0.32, 0.64)] with increasing excitation power. Analysis of the power-dependent UC luminescence found three- and two-photon processes for RE=Ho and Er, respectively, and the possible UC mechanisms were proposed.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-2277-4) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

(La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

Wang

Liu

et al. 2017

Nanoscale Res Lett

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“…In previous work, we have demonstrated that the ζ‐potential of oxysulfide NPs in aqueous citrate or calcium carbonate buffered suspensions are in the range of −35 to −55 mV, thus denoting high colloid stability . If we compared those results with this study, it is clear that cell culture medium strongly affects the surface charge distribution of oxysulfide nanoparticles.…”

Section: Discussionmentioning

confidence: 63%

“…IR spectra showed that during the sulfidation process, the hydroxycarbonate groups (OH and

{CO}_{3}^{2}

) [Figure (B‐III)] were eliminated rendering only the oxysulfides [Figure (B‐IV)]. From a chemical point of view, these results suggest that after thermal treatments, the particle surface is free of organic functional groups or impurities . To confirm the formation of a crystalline structure, hydroxycarbonate‐ and GOS‐NPs were analyzed by WAXD technique.…”

Section: Resultsmentioning

confidence: 99%

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Toxicity evaluation of high-fluorescent rare-earth metal nanoparticles for bioimaging applications

Hernández‐Adame

Cortez-Espinosa

Portales-Pérez

et al. 2015

J. Biomed. Mater. Res.

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Research on nanometer-sized luminescent semiconductors and their biological applications in detectors and contrasting agents is an emergent field in nanotechnology. When new nanosize technologies are developed for human health applications, their interaction with biological systems should be studied in depth. Rare-earth elements are used in medical and industrial applications, but their toxic effects are not known. In this work, the biological interaction between terbium-doped gadolinium oxysulfide nanoparticles (GOSNPs) with human peripheral blood mononuclear cells (PBMC), human-derived macrophages (THP-1), and human cervical carcinoma cell (HeLa) were evaluated. The GOSNPs were synthetized using a hydrothermal method to obtain monodisperse nanoparticles with an average size of 91 ± 9 nm. Characterization techniques showed the hexagonal phase of the Gd O S:Tb free of impurities, and a strong green emission at λ = 544 nm produced by Tb was observed. Toxic effects of GOSNPs were evaluated using cell viability, apoptosis, cell-cycle progression, and immunological response techniques. In addition, an Artemia model was used to assess the toxicity in vivo. Results indicated cell apoptosis in both types of cells with less sensitivity for PBMC cells compared to HeLa cells. In addition, no toxic effects were observed in the in vivo model of Artemia. Moreover, GOSNPs significantly reduced the activation and cell-cycle progression of PBMC and HeLa cells, respectively. Interestingly, an increase in proinflammatory cytokines was not observed. Our data suggest that fluorescence applications of GOSNPs for biolabeling are not toxic in primary immune cells and they may have an immunomodulatory effect. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 605-615, 2017.

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“…Similarly, Chen et al 16 reported that lanthanide doping of an alkaline-earth metal fluoride resulted in significantly improved monodispersity. A common strategy for enhancing the luminescence is to tune the doping concentration of lanthanide ions, 17,18 but high doping level may lead to concentration quenching, particularly in the short-wavelength spectral region, which may deteriorate the luminescence intensity. Also, energy transfer from the host or sensitizer to an activator in many inorganic hosts has been demonstrated to be effective to improve the luminescence intensity.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Luminescence of La3+-Doped Gadolinium Oxysulfide with Tunable Crystalline Size

Ding

Wang

Zhang

et al. 2017

Journal of Elec Materi

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The concentration of La 3+ in (La x Gd 1Àx ) 2 O 2 S:Tb phosphors prepared by the sulfide fusion method from coprecipitated oxalate precursors has been tuned, and the prominent effect on the crystalline size, particle size, and luminescence properties investigated. First-principles calculations were used to characterize the charge deformation, energy gap, and crystal field. According to density functional theory, the electron density of states in conduction bands increased with increase in the La 3+ concentration. The increased electronic density strengthened the repulsion and thus decreased the diffusion so as to decrease the crystalline size from 106.2 nm to 37.3 nm. The particle size of (La x Gd 1Àx ) 2 O 2 S:Tb increased from 0.21 lm to 1.25 lm as the La 3+ concentration was increased from 15 mol.% to 60 mol.%. The excitation spectrum shifted towards shorter wavelength, enhancing the luminescence intensity of (La x Gd 1Àx ) 2 O 2 S:Tb when excited at 254 nm. Furthermore, shorter lifetime was obtained due to lower symmetry as more Gd 3+ was substituted by La 3+ ions.

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Synthesis, characterization, and photoluminescence properties of Gd:Tb oxysulfide colloidal particles

Cited by 24 publications

References 38 publications

(La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

(La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

Toxicity evaluation of high-fluorescent rare-earth metal nanoparticles for bioimaging applications

Enhanced Luminescence of La3+-Doped Gadolinium Oxysulfide with Tunable Crystalline Size

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