Remarkable influence of alkaline earth ions on the enhancement of fluorescence from Eu3+ ion doped in sodium ortho-phosphate phosphors

Balakrishna, A.; Reddy, Leelakrishna; Ntwaeaborwa, O.M.; Swart, H.C.

doi:10.1016/j.molstruc.2019.127375

Cited by 29 publications

(8 citation statements)

References 59 publications

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“…PO 4 3− could be identified through the phosphorus–oxygen bonds with signals at 1040 and 572 cm −1 (PO and OPO), which were due to the internal asymmetric stretching and bending vibrations of the phosphate radical, proving the presence of phosphate radicals in the material. [ 27–29 ] In the interval of 906–1198 cm −1 , the strength further increased with an increase in coating amount. When the coating content was increased from 1% to 3%, the peaks at 1012 and 1040 cm −1 (PO) gradually increased and decreased, respectively, indicating that the ratio between Na 3 PO 4 and Mg 3 (PO 4 ) 2 in the material gradually decreased.…”

Section: Resultsmentioning

confidence: 99%

Conversion of Surface Residual Alkali to Solid Electrolyte to Enable Na‐Ion Full Cells with Robust Interfaces

Dang

Zhou

et al. 2023

Advanced Materials

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The deposition of volatilized Na+ on the surface of the cathode during sintering results in the formation of surface residual alkali (NaOH/Na2CO3/NaHCO3) in layered cathode materials, leading to serious interfacial reactions and performance degradation. This phenomenon is particularly evident in O3‐NaNi0.4Cu0.1Mn0.4Ti0.1O2 (NCMT). In this study, we propose a strategy to transform waste into treasure by converting residual alkali into a solid electrolyte. Mg(CH3COO)2 and H3PO4 are reacted with surface residual alkali to generate the solid electrolyte NaMgPO4 on the surface of NCMT, which can be labeled as NaMgPO4@NaNi0.4Cu0.1Mn0.4Ti0.1O2‐X (NMP@NCMT‐X, where X indicates the different amounts of Mg2+ and PO43−). NaMgPO4 acts as a special ionic conductivity channel on the surface to improve the kinetics of the electrode reactions, remarkably improving the rate capability of the modified cathode at a high current density in the half‐cell. Additionally, NMP@NCMT‐2 enables a reversible phase transition from the P3 to OP2 phase in the charge–discharge process above 4.2 V and achieves a high specific capacity of 157.3 mAh g−1 and outstanding capacity retention in the full cell. The strategy can effectively and reliably stabilize the interface and improve the performance of layered cathodes for Na‐ion batteries (NIBs).This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Conversion of Surface Residual Alkali to Solid Electrolyte to Enable Na‐Ion Full Cells with Robust Interfaces

Dang

Zhou

et al. 2023

Advanced Materials

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“…These peaks are attributed specifically to the electronic transitions of Sm 3+ ions from 4 G 5/2 to 6 H J (J = 5/2, 7/2, 9/2, 11/2) [37]. As Sm 3+ enters the different crystallographic cationic positions (Sr 2+ and Ca 2+ ) in the Sr 3 (PO 4 ) 2 and Ca 3 (PO 4 ) 2 host lattices, it is envisaged that it would experience varied crystal field strengths and covalence, leading to variable emission wavelength [38, 39]. Both the 4 G 5/2 to 6 H 5/2 and 4 G 5/2 to 6 H 9/2 electronic transitions are permitted to undergo magnetic and electric dipole transitions, respectively [19].…”

Section: Resultsmentioning

confidence: 99%

Impact of ligand environment on optical, luminescence and thermometric behavior of A₃(PO₄)₂:Sm³⁺ (A = Ca, Sr) phosphors

Singh,

Manhas,

Bedyal

et al. 2023

Luminescence

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The present study investigates the impact of the ligand environment on the luminescence and thermometric behavior of Sm3+ doped A3(PO4)2 (A = Sr, Ca) phosphors prepared by combustion synthesis. The structural and luminescent properties of Sm3+ ions in the phosphate lattices were investigated using powder X‐ray diffraction (PXRD) and photoluminescence (PL) techniques. PXRD results of the synthesized phosphors exhibit the expected phases that are in agreement with their respective standards. Fourier‐transform infrared (FTIR) spectroscopy confirms the presence of PO4 vibrational bands. Upon excitation with near ultraviolet light, the PL studies indicated that Sr3(PO4)2:Sm3+ phosphors exhibit a yellow light emission, whereas Ca3(PO4)2:Sm3+ phosphors exhibit an emission of orange light. The PL emission results are in accordance with the CIE coordinates, with the Sr3(PO4)2:Sm3+ phosphors showing coordinates of (0.56, 0.44), and the Ca3(PO4)2:Sm3+ phosphors displaying coordinates of (0.60, 0.40). Thermal analysis shows improved stability of Ca3(PO4)2:Sm3+ based on lower weight reduction in thermogravimetric analysis. The effect of temperature on the luminescence properties of the phosphor has been examined upon a 405 nm excitation. By using the fluorescence intensity ratio (FIR) method, the temperature responses of the emission ratios from the Sm3+: the 4F3/2 → 6H5/2 transition to the 4G5/2 → 6H7/2 and 4F3/2 → 6H5/2 transition to the 4G5/2 → 6H9/2 emissions are characterized. The Ca3(PO4)2:Sm3+ phosphors are more sensitive as compared with the Sr3(PO4)2:Sm3+ phosphors. The earlier research findings strongly indicate that these phosphors hold great promise as ideal candidates for applications in non‐invasive optical thermometry and solid‐state lighting devices.

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“…18,19 For the generation of white light, different varieties of host matrices have been explored, such as phosphates, oxides, sulfates, aluminates, vanadates, etc. [20][21][22][23][24][25][26] Amongst all the mentioned host matrices, oxide hosts are considered to be the most important because of their characteristic features like stable crystal structure, ease of synthesis, economical, increased tensile strength, high chemical and thermal stability, moisture resistance, and most importantly, their eco-friendly nature. 20,27,28 Furthermore, the oxide host materials were found to have a broad bandgap and inefficient luminous characteristics.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, photoluminescence, Judd–Ofelt analysis, and thermal stability studies of Dy³⁺-doped BaLa₂ZnO₅ phosphors for solid-state lighting applications

Ayoub

Kumar

2023

RSC Adv.

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Remarkable influence of alkaline earth ions on the enhancement of fluorescence from Eu3+ ion doped in sodium ortho-phosphate phosphors

Cited by 29 publications

References 59 publications

Conversion of Surface Residual Alkali to Solid Electrolyte to Enable Na‐Ion Full Cells with Robust Interfaces

Conversion of Surface Residual Alkali to Solid Electrolyte to Enable Na‐Ion Full Cells with Robust Interfaces

Impact of ligand environment on optical, luminescence and thermometric behavior of A₃(PO₄)₂:Sm³⁺ (A = Ca, Sr) phosphors

Synthesis, photoluminescence, Judd–Ofelt analysis, and thermal stability studies of Dy³⁺-doped BaLa₂ZnO₅ phosphors for solid-state lighting applications

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Remarkable influence of alkaline earth ions on the enhancement of fluorescence from Eu3+ ion doped in sodium ortho-phosphate phosphors

Cited by 29 publications

References 59 publications

Conversion of Surface Residual Alkali to Solid Electrolyte to Enable Na‐Ion Full Cells with Robust Interfaces

Conversion of Surface Residual Alkali to Solid Electrolyte to Enable Na‐Ion Full Cells with Robust Interfaces

Impact of ligand environment on optical, luminescence and thermometric behavior of A3(PO4)2:Sm3+ (A = Ca, Sr) phosphors

Synthesis, photoluminescence, Judd–Ofelt analysis, and thermal stability studies of Dy3+-doped BaLa2ZnO5 phosphors for solid-state lighting applications

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Impact of ligand environment on optical, luminescence and thermometric behavior of A₃(PO₄)₂:Sm³⁺ (A = Ca, Sr) phosphors

Synthesis, photoluminescence, Judd–Ofelt analysis, and thermal stability studies of Dy³⁺-doped BaLa₂ZnO₅ phosphors for solid-state lighting applications