Phase composition and morphology of nanoparticles of yttrium orthophosphates synthesized by microwave-hydrothermal treatment: The influence of synthetic conditions

Ванецев, А. С.; Samsonova, Elena V.; Gaitko, O. M.; Keevend, Kerda; Попов, А. В.; Mäeorg, Uno; Mändar, Hugo; Силдос, И.; Orlovskii, Yu.V.

doi:10.1016/j.jallcom.2015.03.125

Cited by 40 publications

(23 citation statements)

References 20 publications

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“…This is not f-f intraband transitions, but electric dipole allowed f-d transitions in some rare earth ions in crystals. Of course, a lot of things still should be clarified (including an influence of nanoparticle surface on FRET and details of UV SNOM construction), but actually the research aiming the use of LaF 3 :Pr 3+ and LaF 3 :Ce 3+ nanoparticles (lasing in LaF 3 :Ce 3+ crystals also has been reported 66 ) made by microwave-hydrothermal technique 67 as FRET SNOM probes has already started. Situation is very different for three-valent Pr and Ce ions in different crystals, where even at room temperatures the quantum efficiency of f-d transition is close to unity 63 which, in particular, enabled recently to observe single praseodymium ion in YAG 64 and YSO 65 crystals.…”

Section: On the Possibilities Of Fret Snom With Rare Earth Ions In (Nmentioning

confidence: 99%

“…the optical emission cross section s ¼ 6.8 Â 10 À18 cm 2 and the uorescence time ¼ 50 ns (band 280-315 nm), 58 show that the corresponding systems should be quite comparable with FRET SNOM probes exploiting dye molecules (but we hope much more photostable). Of course, a lot of things should still be claried (including the inuence of the nanoparticle surface on FRET and details of the UV SNOM construction), but actually the research aiming to use LaF 3 :Pr 3+ and LaF 3 :Ce 3+ nanoparticles (lasing in LaF 3 :Ce 3+ crystals has also been reported 66 ) made by microwave-hydrothermal techniques 67 as FRET SNOM probes has already started.…”

Section: The Possibilities Of Fret Snom With Rare Earth Ions In (Nano...mentioning

confidence: 99%

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Single molecule fluorescence resonance energy transfer scanning near-field optical microscopy: potentials and challenges

et al. 2015

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A few years ago, single molecule Fluorescence Resonance Energy Transfer Scanning Near-Field Optical Microscope (FRET SNOM) images were demonstrated using CdSe semiconductor nanocrystal-dye molecules as donor-acceptor pairs. Corresponding experiments reveal the necessity to exploit much more photostable fluorescent centers for such an imaging technique to become a practically used tool. Here we report the results of our experiments attempting to use nitrogen vacancy (NV) color centers in nanodiamond (ND) crystals, which are claimed to be extremely photostable, for FRET SNOM. All attempts were unsuccessful, and as a plausible explanation we propose the absence (instability) of NV centers lying close enough to the ND border. We also report improvements in SNOM construction that are necessary for single molecule FRET SNOM imaging. In particular, we present the first topographical images of single strand DNA molecules obtained with fiber-based SNOM. The prospects of using rare earth ions in crystals, which are known to be extremely photostable, for single molecule FRET SNOM at room temperature and quantum informatics at liquid helium temperatures, where FRET is a coherent process, are also discussed.

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Section: On the Possibilities Of Fret Snom With Rare Earth Ions In (Nmentioning

confidence: 99%

Section: The Possibilities Of Fret Snom With Rare Earth Ions In (Nano...mentioning

confidence: 99%

Single molecule fluorescence resonance energy transfer scanning near-field optical microscopy: potentials and challenges

et al. 2015

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“…29−31 Similarly, some experimental studies demonstrated that for the Ln 3+ ion doped YPO 4 system prepared in hydrothermal conditions, the phase transformation from t-to h-phase YPO 4 is easy to be controlled or fine-tuned. 26 Differently, Y 3+ has the same coordination number of 8 in both the t-and h-phase YPO 4 , 1,2 which drives us to understand the phase transformation from t-to h-phase YPO 4 conception in terms of coordination number, strong steric hindrance, and repulsion. To date, the mechanism of the phase transformation from t-to h-phase YPO 4 crystal remains unclear.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The crystal structure of YPO 4 is known to mainly exist in two polymorphic forms, namely, hexagonal (h-) and tetragonal (t-) phases. , The former phase was first reported in 1989. It has P 6 2 22 space group (No.…”

Section: Introductionmentioning

confidence: 99%

Phase Control of Eu³⁺-Doped YPO₄ Nano-/Microcrystals

Li¹,

Zhang²,

Zhang³

et al. 2017

Crystal Growth & Design

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The crystal phase control is one of the most important issues in materials science, because different atomic arrangements and electronic structures of crystals will endow materials with enhanced or new functionalities. However, exploring a general rule to the phase control is extremely difficult, since the formation of new crystal phases is usually induced by many reaction parameters or methods. Here we describe a Eu3+ (5 atom %)-doped YPO4 nano-/microcrystal system in which the phase can be rationally tuned in hexagonal or tetragonal. We confirm that manipulating the relative concentrations of phosphate groups and free RE3+ ions in using different approaches in the reaction solution can determine the formation of the final crystallographic phase of the Eu3+-doped YPO4 nano-/microcrystals. Experimental observations show crystal structure offering powerful control over the morphologies and optical emission properties of the resulting nano-/microcrystals. We believe that the structural control scheme, demonstrated here in Eu3+-doped YPO4 nano-/microcrystals, could be extended to other inorganic nano-/microcrystal systems for their desirable applications and their correlated fundamental research.

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“…In present work we chose two different water based synthetic approaches to LaF 3 :Nd 3+ NPs: hydrothermal microwave treatment (HTMW), allowing one to obtain highly crystalline NPs, and co‐precipitation (CO) technique widely used due to its extreme simplicity . The aim was to study the correlation between the crystallinity of LaF 3 :Nd 3+ NPs, assuming it depends on synthesis method, and their fluorescent properties.…”

Section: Introductionmentioning

confidence: 99%

Relation of Crystallinity and Fluorescent Properties of LaF₃ :Nd³⁺ Nanoparticles Synthesized with Different Water-Based Techniques

et al. 2017

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We use two water based synthetic approaches to LaF 3 :Nd 3 + nanoparticles (NPs), hydrothermal microwave treatment (HTMW) and co-precipitation (CO) technique, with different temperature of the reaction mixture to study the correlation between the degree of crystallinity of LaF 3 :Nd 3 + NPs and their fluorescence properties. We showed that the fluorescence spectra and quenching kinetics can be a powerful tool to reveal the crystal lattice defects, namely agglomerations of the dopant ions (Nd 3 + ) and the OH À positioned in the volume of the doped NPs. We found that reduced number of such crystal lattice defects as Nd 3 + pairs and clusters and the OH groups in the volume of the HTMW NPs leads to much higher fluorescence brightness than for CO NPs. The higher temperature of reaction mixture during HTMW synthesis results in better crystallinity and much higher fluorescence brightness of the produced NPs. But we believe that these results could be applied more generally to the development of synthetic strategies for bright fluorescent NPs. In sum, it's not the condition of NPs surface, but the degree of their crystallinity should be a major concern while choosing the synthetic path, as it generally predetermines their fluorescent properties.

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Phase composition and morphology of nanoparticles of yttrium orthophosphates synthesized by microwave-hydrothermal treatment: The influence of synthetic conditions

Cited by 40 publications

References 20 publications

Single molecule fluorescence resonance energy transfer scanning near-field optical microscopy: potentials and challenges

Single molecule fluorescence resonance energy transfer scanning near-field optical microscopy: potentials and challenges

Phase Control of Eu³⁺-Doped YPO₄ Nano-/Microcrystals

Relation of Crystallinity and Fluorescent Properties of LaF₃ :Nd³⁺ Nanoparticles Synthesized with Different Water-Based Techniques

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Phase composition and morphology of nanoparticles of yttrium orthophosphates synthesized by microwave-hydrothermal treatment: The influence of synthetic conditions

Cited by 40 publications

References 20 publications

Single molecule fluorescence resonance energy transfer scanning near-field optical microscopy: potentials and challenges

Single molecule fluorescence resonance energy transfer scanning near-field optical microscopy: potentials and challenges

Phase Control of Eu3+-Doped YPO4 Nano-/Microcrystals

Relation of Crystallinity and Fluorescent Properties of LaF3 :Nd3+ Nanoparticles Synthesized with Different Water-Based Techniques

Contact Info

Product

Resources

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Phase Control of Eu³⁺-Doped YPO₄ Nano-/Microcrystals

Relation of Crystallinity and Fluorescent Properties of LaF₃ :Nd³⁺ Nanoparticles Synthesized with Different Water-Based Techniques