Photoluminescence and radioluminescence study of Eu and Mn doped RbMgF3 nanoparticles

Gaedtke, C.; Williams, G. V. M.; Janssens, S.; Raymond, S. G.; Clarke, David J.

doi:10.1016/j.radmeas.2013.01.062

Cited by 10 publications

(19 citation statements)

References 11 publications

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“…[ 18–19 ] Doped with rare earth ions and codoped with divalent manganese, alkali alkaline earth fluoroperovskites have been of interest for photoluminescence application and radiation dosimetry. [ 20–28 ] For instance, Sommerdijk and Bril reported on weak Eu 2+ luminescence in RbCaF 3 (475 nm at 300 K) and bright green emission in CsCaF 3 . Lately, Eu 2+ emission has also been studied in such hydride–fluoride solid solution series or hydrides with fluoride structural analogs, such as MMgH x F 3− x (M = Na, K, Rb), K 2 MgH 4 , LiMH 3 (M = Sr, Ba), LiSr 2 SiO 4 H or Sr 5 (BO 3 ) 3 H, [ 29–36 ] and a correlation between the hydride content and redshift of the emission energies was found, which can be explained by the stronger nephelauxetic effect of hydride compared to fluoride.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19] Doped with rare earth ions and codoped with divalent manganese, alkali alkaline earth fluoroperovskites have been of interest for photoluminescence application and radiation dosimetry. [20][21][22][23][24][25][26][27][28] For instance, Sommerdijk and Bril reported on weak Eu 2+ luminescence in RbCaF 3 (475 nm at 300 K) and bright green emission in CsCaF 3 . Lately, Eu 2+ emission has also been studied in such hydride-fluoride solid solution series or hydrides with fluoride structural analogs, With increasing interest in mixed-anionic hydrides, a number of interesting properties have been reported.…”

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confidence: 99%

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MCaH_xF₃₋_x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu²⁺ Luminescence

Mutschke

Wylezich

Sontakke

et al. 2021

Advanced Optical Materials

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is known to allow for a tailoring of the emission properties of the 5d-4f transition of Eu 2+ , [7][8][9][10] in the following, the structural and optical properties of the (Eu 2+ -doped) systems MCaH 3 -MCaF 3 (M = Rb, Cs) are investigated.In case of M = Rb, so far no solid solution series was reported and the pure hydride and fluoride both crystallize in the ideal cubic perovskite structure type at room temperature. [11][12][13][14][15] For M = Cs, the partial solid solution series CsCaH x F 3−x (0 ≤ x ≤ 1.70) crystallizing in the cubic perovskite structure type has been reported earlier [16] as well as the pure hydride CsCaH 3 . [17] However, due the synthesis route starting from CsF, CaF 2 , and CaH 2 , the possible composition range of the solid solution was limited to an upper limit of x = 2. In case of the lighter M = K, a solid-solution series with a miscibility gap as well as a change from a tetragonal structure with partial anion ordering to the GdFeO 3 structure type for fluoride rich samples has been reported. [18][19] Doped with rare earth ions and codoped with divalent manganese, alkali alkaline earth fluoroperovskites have been of interest for photoluminescence application and radiation dosimetry. [20][21][22][23][24][25][26][27][28] For instance, Sommerdijk and Bril reported on weak Eu 2+ luminescence in RbCaF 3 (475 nm at 300 K) and bright green emission in CsCaF 3 . Lately, Eu 2+ emission has also been studied in such hydride-fluoride solid solution series or hydrides with fluoride structural analogs, With increasing interest in mixed-anionic hydrides, a number of interesting properties have been reported. Here, the structural and optical properties of (Eu 2+ -doped) MCaH 3 -MCaF 3 (M = Rb, Cs) are investigated. For M = Rb, a complete hydride-fluoride solid solution series is found and for M = Cs, the known solid solution series (0 ≤ x ≤ 1.70) can be extended to x = 3. In case of Cs, a very bright luminescence emission is observed in Eu 2+ -doped samples, whereas the luminescence is fairly weak in Rb based compounds. With increasing hydride content, a shift of the emission color from cyan-green to red can be observed. In contrast to earlier reports for mixed fluoride-hydride host, the redshift is not a gradual shift of a single broad emission band, but the appearance of new narrow emission bands on the low energy side, which are assigned to the occupation of sites with higher hydride content. Consequently, this finding represents the first example in a mixed anionic hydride with a site-sensitive emission for sites with locally varying hydride content in the first coordination sphere and may serve as a general example for emission color tuning taking advantage of mixed-anionic compounds.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

MCaH_xF₃₋_x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu²⁺ Luminescence

Mutschke

Wylezich

Sontakke

et al. 2021

Advanced Optical Materials

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“…OSL dosimeters can also be combined with radioluminescence dosimeters (RLD) [23,24,36]. The bulk materials which are observed in this thesis show OSL [3] and RL [10,11,12]. RLD have the advantage for real-time read-out, which means the absorbed dose in the material can be measured as a function of the intensity of the emitted light.…”

Section: Dosementioning

confidence: 99%

“…Radioluminescence (RL) has recently attracted considerable interest, because it can be employed to determine the real-time radiation dose rate for radiation protection, nondestructive testing, and in medicine for monitoring radiation dose during radiotherapy or for dose verification and validation [10,11,12,70,71]. where some electrons will recombine with the trapped holes.…”

Section: Radioluminescencementioning

confidence: 99%

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Advanced Materials for Radiation Dosimetry

Gädtke¹

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<p>The motivation for this work was to find materials that have the following characteristics: good optical transparency, rapid read-out, automation of read-out, good fading characteristic, promise high sensitivity to ionising radiation, and tissue equivalence for use in medical applications. For example, there are medical applications in brachytherapy and high-energy photon therapy for the treatment of cancer. These applications benefit small dosimeters for monitoring radiation during radiotherapy or for dose verification and validation. This thesis studies fluoroperovskite materials that were manufactured as bulk materials or nanoparticles. The techniques of photoluminescence (PL), radioluminescence (RL), thermoluminescence (TL) and optically stimulated luminescence (OSL) were employed in order to get a deeper understanding of the defect distribution in these materials. A detailed model of the trap distribution was developed from the results of these measurements. It was observed that compared to the bulk materials, the nanoparticles show a lower PL lifetime and less dependence on the dose of the RL intensity, which is due to the different defect distribution. The nanoparticles also demonstrate more low temperature peaks in the TL glow curves. PL and RL measurements of Eu3+ doped samples show that the crystal environment of the Eu3+ in the bulk material is more distorted than for the nanoparticles. For the bulk materials, the thermal coefficient of the RL is <0.4 %/K, which is a desirable property of real -time dosimeters. The thermal coefficient of the RL in the nanoparticles has a high uncertainty ( 7 %/K) compared to the bulk materials ( 0.4 %/K). For the fluoride nanoparticles, it was observed that the PL lifetimes for the LaF3 decreases with increasing rare earth concentrations. This can be attributed to energy transfer from luminescence ions in the core to luminescence ions near the surface followed by non-radiative decay. In comparison, the decrease of the PL lifetimes of RbMgF3 and NaMgF3 is predominantly due to non-radiative recombination centres inside the crystal.</p>

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Atomistic Simulation of Structural and Mechanical Properties of the AMgF₃ (A = K, Rb, and Cs) Compounds Under Hydrostatic Pressure

Sousa

Lima

2019

J Comput Chem

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Structural, mechanical, elastic, and dielectric properties of the AMgF3 (A = K, Rb, and Cs) compounds were investigated using classical atomistic simulation. A new set of interatomic potentials was developed for these compounds. Lattice parameters and interatomic distances have shown to accurately reproduce all structures, with very close agreement to the experimental data. In all cases, the relative error is below 0.5%. Effect of hydrostatic pressure in the structural, mechanical, elastic, and dielectric properties of these materials were studied from 0 up to 50 GPa. Compounds behavior and stability under pressure were analyzed. KMgF3 and RbMgF3 changed from brittle to ductile at approximately 2 GPa. These calculations play an important role in understanding the properties of the AMgF3 (A = K, Rb, and Cs) compounds under pressure, and open up a new opportunity to study defects in this class of materials. © 2019 Wiley Periodicals, Inc.

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Photoluminescence and radioluminescence study of Eu and Mn doped RbMgF3 nanoparticles

Cited by 10 publications

References 11 publications

MCaH_xF₃₋_x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu²⁺ Luminescence

MCaH_xF₃₋_x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu²⁺ Luminescence

Advanced Materials for Radiation Dosimetry

Atomistic Simulation of Structural and Mechanical Properties of the AMgF₃ (A = K, Rb, and Cs) Compounds Under Hydrostatic Pressure

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Photoluminescence and radioluminescence study of Eu and Mn doped RbMgF3 nanoparticles

Cited by 10 publications

References 11 publications

MCaHxF3−x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu2+ Luminescence

MCaHxF3−x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu2+ Luminescence

Advanced Materials for Radiation Dosimetry

Atomistic Simulation of Structural and Mechanical Properties of the AMgF3 (A = K, Rb, and Cs) Compounds Under Hydrostatic Pressure

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Product

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About

MCaH_xF₃₋_x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu²⁺ Luminescence

MCaH_xF₃₋_x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu²⁺ Luminescence

Atomistic Simulation of Structural and Mechanical Properties of the AMgF₃ (A = K, Rb, and Cs) Compounds Under Hydrostatic Pressure