Core–shell metal fluoride nanoparticles via fluorolytic sol–gel synthesis – a fast and efficient construction kit

Ritter, Benjamin; Haida, Philipp; Krahl, Thoralf; Scholz, Gudrun; Kemnitz, Erhard

doi:10.1039/c7tc01599b

Cited by 23 publications

(26 citation statements)

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“…a multiphase system instead of a one-phase system. These obstacles were successfully circumnavigated and hence the synthesis of such systems is also possible [40][41][42][43][44]. Figure 4 shows some typical examples of the appearance and particle analysis of different binary metal fluoride sols.…”

Section: Fluorolytic Sol-gel Synthesismentioning

confidence: 99%

Nano metal fluorides: small particles with great properties

2020

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The recently developed fluorolytic sol–gel route to metal fluorides opens a very broad range of both scientific and technical applications of the accessible high surface area metal fluorides, many of which have already been applied or tested. Specific chemical properties such as high Lewis acidity and physical properties such as high surface area, mesoporosity and nanosize as well as the possibility to apply metal fluorides on surfaces via a non-aqueous sol make the fluorolytic synthesis route a very versatile one. The scope of its scientific and technical use and the state of the art are presented.

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Section: Fluorolytic Sol-gel Synthesismentioning

confidence: 99%

Nano metal fluorides: small particles with great properties

2020

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“…In the past years, core-shell structured nanoparticles possessing an inorganic core surrounded by an inorganic shell have been invented to reduce radiation-free relaxations, to improve luminescent light output, to increase quantum efficiency, and to solve the problems from undesired energy transfers in multirare-earth-doped systems, which result in a divergent color impression. Using the fluorolytic sol-gel route, in 2017, core-shell structured metal fluoride nanoparticles were prepared for the first time [59]. This method enables the synthesis of large amounts (kilogram) of nanostructured core-shell particles in one batch at room temperature.…”

Section: Caf 2 Srf 2 and Baf 2 As Hosts For Rare Earth Metalsmentioning

confidence: 99%

“…PLQY: Photoluminescence quantum yield. Reproduced from Reference[59] with the permission of the Royal Chemical Society.…”

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Fluorolytic Sol–Gel Synthesis of Nanometal Fluorides: Accessing New Materials for Optical Applications

Scheurell

Kemnitz

2018

Inorganics

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The potential of fluorolytic sol–gel synthesis for a wide variety of applications in the field of optical materials is reviewed. Based on the fluorolytic sol–gel synthesis of nanometal fluorides, sols of complex fluorometalates have become available that exhibit superior optical properties over known classical binary metal fluorides as, for instance, magnesium fluoride, calcium fluoride, or strontium fluoride, respectively. The synthesis of transparent sols of magnesium fluoroaluminates of the general composition MgxAlFy, and fluoroperovskites, [K1−xNax]MgF3, is reported. Antireflective coatings fabricated from MgF2, CaF2, MgxAlFy, and [K1−xNax]MgF3 sols and their relevant properties are comprehensively described. Especially the heavier alkaline earth metal fluorides and the fluorperovskites crystallizing in a cubic crystal structure are excellent hosts for rare earth (RE) metals. Thus, the second chapter reflects the synthesis approach and the properties of luminescent systems based on RE-doped alkaline earth metal fluorides and [K1−xNax]MgF3 phases.

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“…It should also be noted that the quantum yield of up-conversion luminescence is not high and usually stays at the level of few percents. Solid solutions powders based on SrF 2 doped by rare earth elements can be synthesized by different techniques: co-precipitation from aqueous solutions by various fluorinating agents such as HF, NH 4 F, KF, NaF [13][14][15], sol-gel processing in organic solution [16], combustion [17] and hydrothermal synthesis [18][19][20]. Sol-gel processing in organic solution used gaseous HF, which is very dangerous.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and quantum yield investigations of the Sr(1-x-y)Pr(x)Yb(y)F(2+x+y) luminophores for photonics

Kuznetsov¹,

Proydakova²,

Морозов³

et al. 2018

Nanosystems: Phys. Chem. Math.

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Single-phase praseodymium-and ytterbium-doped strontium fluoride solid solutions were prepared by co-precipitation from aqueous nitrate solutions followed by annealing at 600 • C. Based on EDX analysis, the content of rare-earth elements in solid phase is slightly higher rather than in initial aqueous solution. All the characteristic praseodymium and ytterbium luminescent bands were present. The most intense luminescence in 800-1100 nm range was registered in SrF 2 :Pr (0.1 mol.%):Yb (10.0 mol.%) solid solution. Using the integrating sphere, the values of the quantum yield were estimated. The maximum quantum yield was 1.1 % for Sr 0.9495 Pr 0.0005 Yb 0.05 F 2.0505 solid solution.

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Core–shell metal fluoride nanoparticles via fluorolytic sol–gel synthesis – a fast and efficient construction kit

Abstract: An efficient, fast and easy construction kit using the fluorolytic sol–gel synthesis of rare-earth-doped alkaline earth fluoride core–shell nanoparticles at room temperature is presented, capable of synthesizing several hundred grams to kilograms of core–shell particles in one batch.

Cited by 23 publications

References 50 publications

Nano metal fluorides: small particles with great properties

Nano metal fluorides: small particles with great properties

Fluorolytic Sol–Gel Synthesis of Nanometal Fluorides: Accessing New Materials for Optical Applications

Synthesis and quantum yield investigations of the Sr(1-x-y)Pr(x)Yb(y)F(2+x+y) luminophores for photonics

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