Synthesis, spectroscopic and structural studies on YOF, LaOF and GdOF nanocrystals doped with Eu3+, synthesized via stearic acid method

Grzyb, Tomasz; Węcławiak, Mariusz; Pędziński, Tomasz; Lis, Stefan

doi:10.1016/j.optmat.2013.06.007

Cited by 44 publications

(18 citation statements)

References 67 publications

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“…A strong charge-transfer band due to oxygen impurities was present in the reflection spectrum of NaEuF 4 [252]. Of course, such a charge-transfer band is also present in oxyfluorides, such as YOF:Eu 3+ [530,531]. The weakly luminescent N,Ndimethyldithiocarbamato complexes a example of luminescence europium(III) compounds that can be excited by a sulfur-to-europium charge-transfer band [476,479].…”

Section: Transitions To Higher Energy Levelsmentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,357

108

1,912

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Section: Transitions To Higher Energy Levelsmentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,357

108

1,912

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“…Explicit information regarding the structure of the host matrix can be obtained by analysing the emission spectra, as the Eu 3+ emission lines are highly affected by site symmetry (Gupta et al, 2012;Binnemans, 2015). The outstanding spectroscopic characteristics have placed Eu 3+ -based luminescent materials at the forefront of research and investigations of a number of efficient red phosphor materials, such as Eu 3+ -doped yttrium oxide, lanthanum oxyfluoride, lanthanum molybdate, bismuth vanadate etc., have been reported (Srinivasan et al, 2010;Grzyb et al, 2013;Zhang et al, 2007;Gundiah et al, 2008). However, in doped systems, concentration quenching is invariably observed above a certain doping level which limits the luminescence emission.…”

Section: Introductionmentioning

confidence: 99%

Structural and spectroscopic investigations on the quenching free luminescence of europium oxalate nanocrystals

et al. 2019

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The structural features leading to the intense quenching free luminescence exhibited by europium oxalate nanocrystals, poly[[hexaaquatri-2 -oxalatodieuropium] 4.34-hydrate], {[Eu 2 (C 2 O 4 ) 3 (H 2 O) 6 ]Á4.34H 2 O} n , is the focal point of this report. Europium oxalate nanocrystals were synthesized by a simple microwave-assisted co-precipitation method. Powder X-ray diffraction analysis revealed the monoclinic structure of the nanocrystals and the phase purity. The morphology and particle size were examined by transmission electron microscopy (TEM) analysis. Luminescence measurements on a series of samples of La 2-x Eu x (C 2 O 4 ) 3 Á10H 2 O, with x varying in the range 0.1 to 2, established the quenching free nature exhibited by the europium oxalate nanocrystals. A singlecrystal structure analysis was carried out and the quenching free luminescence is explained on the basis of the crystal structure. A detailed photoluminescence characterization was carried out using excitation and emission studies, decay analysis, and CIE coordinate and colour purity evaluation. The various spectroscopic parameters were evaluated by Judd-Ofelt theoretical analysis and the results are discussed on the basis of the crystal structure analysis. research papers Acta Cryst. (2019). C75, 589-597 Alexander et al. Quenching free luminescence of europium oxalate nanocrystals 597

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“…Among them, lanthanide oxyfl uorides have been considered to be attractive candidates for host materials, because they possess the low phonon energy of the lanthanide fl uorides counterparts, the good chemical durability, thermal stability, and excellent mechanical strength of the oxides counterparts. [ 11 ] Moreover, it is expected that the presence of oxygen may widen the excitation range and enhance the emission intensity through the O 2− →Ln 3 + charge transfer (CT). [ 12 ] To date, several …”

mentioning

confidence: 99%

Novel Two‐Step Topotactic Transformation Synthetic Route Towards Monodisperse LnOF:Re,³⁺ (Ln = Y, Pr–Lu) Nanocrystals with Down/Upconversion Luminescence Properties

Shao

Zhao

et al. 2015

Advanced Optical Materials

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functional nanodevices require meticulous mastery over the size and morphology of the materials at the nanometer scale. [ 3 ] Therefore, the synthetic strategy for nanocrystals has long been a central and fundamental theme in the nanoscience and nanotechnology. The current synthetic innovations for nanocrystals tend to emphasize the green concept being confronted with global energy and environmental crisis. [ 4 ] During the last decades, tremendous effort has been invested in the synthesis of inorganic nanocrystals by various synthetic routes. The notable examples include monodisperse noble metals, [ 5 ] metal oxides, [ 6 ] and semiconductors with closed shapes (e.g., cube, octahedron) and hierarchical architectures (e.g., fl ower-like). [ 7 ] The mainly practical synthetic routes are solution-based cothermolysis of metal complex precursors and solvothermal method. [ 8 ] However, these synthetic routes usually need harsh conditions, including toxic organometallic precursors, and hazardous coordinating solvents, which have been matters of environmental concern. Besides, the stringent control over series of experimental variables and tedious processes for separation and purifi cation further restricts their availability and utility. [ 9 ] Therefore, it is of great academic interest and practical signifi cance to seek facile and green synthetic strategies for nanomaterials.Lanthanide (Ln) luminescence has played an irreplaceable role in the forefront of science and technology due to the fascinating optical properties originating from the intra 4f transitions, including narrow emission band, large Stockes shift or anti-Stockes shift, and long-lived luminescence. [ 10 ] Choosing an appropriate host matrix is the precondition for Ln 3+ optical transitions. Among them, lanthanide oxyfl uorides have been considered to be attractive candidates for host materials, because they possess the low phonon energy of the lanthanide fl uorides counterparts, the good chemical durability, thermal stability, and excellent mechanical strength of the oxides counterparts. [ 11 ] Moreover, it is expected that the presence of oxygen may widen the excitation range and enhance the emission intensity through the O 2− →Ln 3 + charge transfer (CT). [ 12 ] To date, several

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Synthesis, spectroscopic and structural studies on YOF, LaOF and GdOF nanocrystals doped with Eu3+, synthesized via stearic acid method

Cited by 44 publications

References 67 publications

Interpretation of europium(III) spectra

Interpretation of europium(III) spectra

Structural and spectroscopic investigations on the quenching free luminescence of europium oxalate nanocrystals

Novel Two‐Step Topotactic Transformation Synthetic Route Towards Monodisperse LnOF:Re,³⁺ (Ln = Y, Pr–Lu) Nanocrystals with Down/Upconversion Luminescence Properties

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Synthesis, spectroscopic and structural studies on YOF, LaOF and GdOF nanocrystals doped with Eu3+, synthesized via stearic acid method

Cited by 44 publications

References 67 publications

Interpretation of europium(III) spectra

Interpretation of europium(III) spectra

Structural and spectroscopic investigations on the quenching free luminescence of europium oxalate nanocrystals

Novel Two‐Step Topotactic Transformation Synthetic Route Towards Monodisperse LnOF:Re,3+ (Ln = Y, Pr–Lu) Nanocrystals with Down/Upconversion Luminescence Properties

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Product

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About

Novel Two‐Step Topotactic Transformation Synthetic Route Towards Monodisperse LnOF:Re,³⁺ (Ln = Y, Pr–Lu) Nanocrystals with Down/Upconversion Luminescence Properties