Polymorph (C2N2H10)0.5RE3F10·xH2O (RE=Ho-Lu, Y) and REF3 nanocrystals: Hydrothermal synthesis, characterization and luminescence

Jia, Liping; Zhang, Qiang; Yan, Bing

doi:10.1016/j.materresbull.2012.07.034

Cited by 7 publications

(4 citation statements)

References 30 publications

(37 reference statements)

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“…Meanwhile, low phonon energy of the matrix material also plays a significant role. Rare-earth fluorides − have been extensively applied as the UC photoluminescence materials because of their low phonon energy, high luminous efficiency, and good stability. In this report, the luminescent properties of Yb 3+ /Er 3+ -, Yb 3+ /Er 3+ /Li + -, and Yb 3+ /Ho 3+ -doped GdF 3 hollow spheres were investigated.…”

Section: Resultsmentioning

confidence: 99%

Highly Uniform Hollow GdF₃ Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Gai

Dai

et al. 2013

ACS Appl. Mater. Interfaces

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In this paper, uniform hollow mesoporous GdF3 micro/nanospheres were successfully prepared by a facile two-step synthesis route without using any surfactant, catalyst, and further calcination process. The precursor Gd(OH)CO3 spheres are prepared by a coprecipitation process. After that, uniform and size-tunable GdF3 hollow spheres were easily coprecipitated with NaBF4 at the sacrifice of the precursor with low temperature and short reaction time. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution TEM, N2 adsorption/desorption, and up-conversion (UC) photoluminescence spectra were used to characterize the as-obtained products. It is found that the initial pH value and NaBF4/Gd(3+) molar ratios play important roles in the structures, sizes, and phases of the hollow products. The growth mechanism of the hollow spheres has been systematically investigated based on the Kirkendall effect. Under 980 nm IR laser excitation, UC luminescence of the as-prepared Yb(3+)/Er(3+)-codoped GdF3 hollow spheres can be changed by a simple adjustment of the concentration of the Yb(3+) ion. Enhanced red emission is obtained by introducing Li(+) ions in GdF3:Yb(3+)/Er(3+). Furthermore, a doxorubicin release experiment and a 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide cytotoxicity assay reveal that the product has potential application in drug delivery and targeted cancer therapy.

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Section: Resultsmentioning

confidence: 99%

Highly Uniform Hollow GdF₃ Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Gai

Dai

et al. 2013

ACS Appl. Mater. Interfaces

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“…The efficiency of energy conversion is mainly decided by the matching extent of the excitation photon energy and rare-earth-ion energy level, and the host material with low phonon energy also plays a significant role. Rare-earth fluorides have been extensively applied as UC-PL materials because of their low phonon energy, high luminous efficiency, and good stability. − In this section, the luminescent properties of LaF 3 :Yb 3+ /Er 3+ , LaF 3 :Yb 3+ /Ho 3+ , and LaF 3 :Yb 3+ /Tm 3+ under 980 nm LD irradiation will be discussed.…”

Section: Results and Discussionmentioning

confidence: 99%

Surfactant-Free Synthesis, Luminescent Properties, and Drug-Release Properties of LaF₃ and LaCO₃F Hollow Microspheres

Gai

Dai

et al. 2013

Inorg. Chem.

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Uniform LaF3 and LaCO3F hollow microspheres were successfully synthesized through a surfactant-free route by employing La(OH)CO3 colloidal microspheres as a sacrificial template and NaBF4 as the fluorine source. The synthetic process consists of two steps: the preparation of a La(OH)CO3 precursor via a facile urea-based precipitation and the following formation of lanthanide fluoride hollow microspheres under aqueous conditions at low temperature (50 °C) and short reaction time (3 h), without using any surfactant and catalyst. The formation of hollow spheres with controlled size can be assigned to the Kirkendall effect. It is found that the phase and structure of the products can be simply tuned by changing the pH values of the solution. Time-dependent experiments were employed to study the possible formation process. N2 adsorption/desorption results indicate the mesoporous nature of LaF3 hollow spheres. Yb(3+)/Er(3+) (Ho(3+)) and Yb(3+)/Tm(3+)-doped LaF3 hollow spheres exhibit characteristic up-conversion (UC) emissions of Er(3+) (Ho(3+)) and Tm(3+) under 980 nm laser-diode excitation, and Ce(3+)/Tb(3+)-doped LaF3 and LaCO3F emit bright yellow-green and near-white light under UV irradiation, respectively. In particular, LaF3:Yb/Er and LaCO3F:Ce/Tb hollow microspheres exhibit obvious sustained and pH-dependent doxorubicin release properties. The luminescent properties of the carriers allow them to be tracked or monitored during the release or therapy process, suggesting their high potential in the biomedical field.

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“…Rare earth fluorides (REF 3 ) are produced by chemical [8,10,11] and physicochemical [12][13][14][15] methods. Synthesis of nanofluorides can be performed using one of the following methods: pyrolysis method of fluorine-containing precursors; hydrothermal synthesis; micro-emulsion method; solvo-thermal synthesis; sol-gel technique.…”

Section: Introductionmentioning

confidence: 99%

“…+ , Cs + ), [28,29] (C 2 N 2 H 10 ) 0.5 RE 3 F 10 •xH 2 O, [13] (C 3 N 2 H 12 ) 0.5 RE 3 F 10 • xH 2 O, [33] or (H 3 O) RE 3 F 10 (RE = TmÀ Lu). [34] Additionally, a compound of a given composition, i. e., (…”

Section: Introductionmentioning

confidence: 99%

The nature of the interaction of RE(NO₃)₃ (yttrium subgroup) with HF or NH₄F

Razumkova

Azarapin

2021

Zeitschrift anorg allge chemie

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The nature of the interaction of RE(NO 3 ) 3 of the yttrium subgroup with fluorinating agents (HF and NH 4 F) is considered. Depending on the pH of the solution as well as the fluorinating agent, it was found that compounds with the compositions of REF 3 (using HF), (H 3 O)RE 3 F 10 (NH 4 F, pH 0-2), NH 4 RE 3 F 10 (NH 4 F, pH 3), and NH 4 RE 2 F 7 (NH 4 F, pH 4) can be obtained by precip-itation. The thermal stability of the obtained compounds and the morphology of the powder particles were established. All compounds obtained from the water environment contained adsorbed water, which was confirmed by FTIR spectroscopy and DSC/TG.

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Polymorph (C2N2H10)0.5RE3F10·xH2O (RE=Ho-Lu, Y) and REF3 nanocrystals: Hydrothermal synthesis, characterization and luminescence

Cited by 7 publications

References 30 publications

Highly Uniform Hollow GdF₃ Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Highly Uniform Hollow GdF₃ Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Surfactant-Free Synthesis, Luminescent Properties, and Drug-Release Properties of LaF₃ and LaCO₃F Hollow Microspheres

The nature of the interaction of RE(NO₃)₃ (yttrium subgroup) with HF or NH₄F

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Polymorph (C2N2H10)0.5RE3F10·xH2O (RE=Ho-Lu, Y) and REF3 nanocrystals: Hydrothermal synthesis, characterization and luminescence

Cited by 7 publications

References 30 publications

Highly Uniform Hollow GdF3 Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Highly Uniform Hollow GdF3 Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Surfactant-Free Synthesis, Luminescent Properties, and Drug-Release Properties of LaF3 and LaCO3F Hollow Microspheres

The nature of the interaction of RE(NO3)3 (yttrium subgroup) with HF or NH4F

Contact Info

Product

Resources

About

Highly Uniform Hollow GdF₃ Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Highly Uniform Hollow GdF₃ Spheres: Controllable Synthesis, Tuned Luminescence, and Drug-Release Properties

Surfactant-Free Synthesis, Luminescent Properties, and Drug-Release Properties of LaF₃ and LaCO₃F Hollow Microspheres

The nature of the interaction of RE(NO₃)₃ (yttrium subgroup) with HF or NH₄F