White light upconversion in NdOHCO3 to Nd2O3 nanocrystals: Structural and optical transition

Portillo, M. Chávez; Moreno, O. Portillo; Mora-Ramírez, M.A.; Avendaño, C. Bueno; Panecatl‐Bernal, Yesmin; Corona, S. Hernandez; Alcántara, J.L.

doi:10.1016/j.ijleo.2021.168272

Cited by 3 publications

(7 citation statements)

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“…This physicochemical behavior and relative thermodynamic stability, which in principle quantitatively allows us to understand the different chemical equilibria associated with the products obtained [23]. We found in preliminary reports, rare earths cations prepared by CBD technique, present the following order OH − and CO 2− 3 of capture (under the same experimental conditions of chemical synthesis); Sm(OH) 3 < Ho(OH) 3 < NdOHCO 3 < ErOOH < CeO 2 [14,15,25,26]. This capture order is linked to properties associated with electron affinity, ionic radii, electronegativity, to mention just a few of these intrinsic characteristics, and requires formal study.…”

Section: Chemical Reactions and Experimental Proceduresmentioning

confidence: 78%

“…The acid-base HCO − 3 equilibria, and the transport of electric charge from one species to another is complex and requires care since it formally depends on the medium and/or the type of solvent that it's difficult to understand them without a quantitative model [27,28]. Tentatively, in crystal growth we propose that the alkaline medium, ionic radii, electronic affinity and synthesis conditions, of capture of OH − and CO 2− 3 ions are crucial in obtaining the corresponding hydroxide and/or carbonate [14,15,25,26,29].…”

Section: Chemical Reactions and Experimental Proceduresmentioning

confidence: 98%

“…The crystalline growth of Dy 2 (CO 3 ) 3( s) nanocrystals is systematically prepared by CBD green technique and the theoretical experimental model is proposed as a first approximation, in a comprehensive manner according to the key stages previously presented [13,14,15,17]. A parameter of interest associated with the crystalline growth of nanoparticles in the solid phase is related to the van der Waals forces present in the aqueous solution in which the positive and negative ions are found.…”

Section: Chemical Reactions and Experimental Proceduresmentioning

confidence: 99%

“…The experimental details associated with the crystal growth parameters applying the green (CBD) technique, have been previously reported [14,15,17,21,[24][25][26]28]. Now, a brief report is presented considering only the most relevant experimental details for crystal growth.…”

Section: Preparation Of the Powdersmentioning

confidence: 99%

“…Despite the advantages of green synthesis, current methods face challenges with appropriate solvent selection, reaction temperature, reagents process chemical parameters that affect the synthesis process [12]. Here, we apply the green technique or Chemical Bath Deposit (CBD) in which the parameters of crystalline growth are easily controlled [13,14,15]. And so, we report a simple method for prepare Dy 2 (CO 3 ) 3( s) powder, and subsequent thermal annealing temperature (TT) in air atmosphere at ∼ 600 • C to study Dy 2 (CO 3 ) 3(a) → Dy 2 O 3( s) transition.…”

Section: Introductionmentioning

confidence: 99%

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Green chemistry synthesis and structural and optical study of Dy2(CO3)3→ Dy2O3 transition

Portillo

Portillo²,

Santiesteban³

et al. 2023

Rev. Mex. Fís.

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This paper presents preliminary results of Dy2(CO3)3→Dy2O3 transition have been successfully obtained by Chemical Bath Deposition technical and subsequent thermal annealing temperature at ~600 °C. Two different temperatures of ~20°C and ~90 °C ± 2 °C are chosen to carry out the nanocrystalline growth. The crystalline phase is investigated by applying X-Ray Diffraction (XRD) and some optical properties; Transmittance, Reflectivity, Normalized Absorbance, real (n) and imaginary (k) parts refractive index. The crystalline phase of these inorganic nanomaterials for Dy2(CO3)3 is orthorhombic phase, while for Dy2O3 it is cubic. Grain size average values located at ranged ~2.8-3.4 nm for Dy2(CO3)3 and ~6.5-9.6 nm for Dy2O3. Vibrational modes are identified by Raman spectroscopy, modes at ~150-1800 cm-1 frequency range assigned to internal vibrations of ion: v1-symmetric stretching (~1098 cm-1) v3-asymmetric -C-O stretching situated at ∼1063 cm-1, were observed corresponding to orthorhombic crystalline phase. The Fg+ Ag and A1g modes, corresponding to cubic phase Dy2O3. Multiple absorption bands with different relative intensities are observed at UV-Vis-NIR region, assigned to 4fs→4fs intra-electronic transitions and band gap energy. Absorption measurement were assigned to the transitions from ground state (6H15/2) to different excited states such as 4I13/2→4F7/2, 4I15/2, 6F3/2, 6F5/2, 6F7/2→6H5/2, 6F9/2→6H7/2, 6F11/2→6H9/2 and 6H11/2 of Dy3+ cation. Tauc’s plot reveals band gap situated at range ~4.66-5.17 eV for Dy2(CO3)3 and ~4.26-4.80 eV for Dy2O3 respectively.

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Section: Chemical Reactions and Experimental Proceduresmentioning

confidence: 78%

Section: Chemical Reactions and Experimental Proceduresmentioning

confidence: 98%

Section: Chemical Reactions and Experimental Proceduresmentioning

confidence: 99%

Section: Preparation Of the Powdersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Green chemistry synthesis and structural and optical study of Dy2(CO3)3→ Dy2O3 transition

Portillo

Portillo²,

Santiesteban³

et al. 2023

Rev. Mex. Fís.

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White Light Emitting Upconversion Nanomaterials

Pavani

Kagola

Jakka

2023

Progress in Optical Science and Photonics

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Crystalline native defects in ZnO analyzed by photoluminescence applying Maxwell-Boltzmann statistics in the visible region

Garrido

Araiza²,

Portillo³

et al. 2023

Rev. Mex. Fís.

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Zinc oxide (ZnO (s) ) is prepared by Chemical Bath Deposition. This manuscript continues with previous research examining the Photoluminiecence at UV-Vis-region. According to emission bands situated at Vis-region by means of Photoluminescence, green (GE) and yellow emission (YE) bands are discussed, which are associated with native intrinsic crystalline defects. The Photoluminescence dependence with the trap density and the surface recombination velocity in the light of the Maxwell-Boltzmann theoretical model (MBM) results associated with the electronic transitions related to the native intrinsic defects situated at9 Vis-region are investigated. The trap density (cm -1 ) of nanocrystals located at range ~8.9-9.9 An approximate a theoretical-experimental kinetic model is presented, considering that the coordination complex ion is a key parameter in the crystal growth of ZnO (s) nanocrystals. The optimized geometry of [Zn(NH 3 ) 4 ] 2+ molecule was obtained with the DFT method using the functional of H-GGA B3LYP.

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White light upconversion in NdOHCO3 to Nd2O3 nanocrystals: Structural and optical transition

Cited by 3 publications

References 60 publications

Green chemistry synthesis and structural and optical study of Dy2(CO3)3→ Dy2O3 transition

Green chemistry synthesis and structural and optical study of Dy2(CO3)3→ Dy2O3 transition

White Light Emitting Upconversion Nanomaterials

Crystalline native defects in ZnO analyzed by photoluminescence applying Maxwell-Boltzmann statistics in the visible region

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