Combustion synthesis and photoluminescence study of novel Sm3+ activated K3La(PO4)2 phosphor for n-UV solid state lighting

Review Biochemical Research Methods

Connecting the Dots: Macromolecular Crowding and Protein Aggregation

Gufran Ahmed Siddiqui et al.

Summary: Alterations in protein folding and the formation of protein aggregates are linked to various diseases. The heterogeneous crowding environment in cells can affect protein conformation.

JOURNAL OF FLUORESCENCE (2023)

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Article Optics

Fabrication of Hybrid Mach-Zehnder Interferometer based on Hollow-Core Photonic Crystal Fiber for Load Measurement

Faraqid Q. Mohammed et al.

Summary: This study proposes an effective method for fabricating a tunable hybrid Mach-Zehnder interferometer (HMZI) and investigates its application in load measurement. By fusion splicing a micro-cavity Fabry-Perot interferometer (FPI) and Mach-Zehnder interferometer (MZI) to a hollow-core photonic crystal fiber (HCPCF) and a single-mode fiber (SMF), a HMZI with two in-line fiber interferometers is developed. The dimensions of the MZI and micro-cavity FPI can be controlled by adjusting various parameters. The experimental results demonstrate the tunability and sensitivity of the HMZI for load measurement. The hybrid structure shows great potential in the aviation industry and engineering health detection.

JOURNAL OF OPTICS-INDIA (2023)

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Article Chemistry, Physical

Synthesis, adjustable-color emission and energy transfer of Ba2MgSi2O7:Sm3+, Bi3+ phosphors

Renping Cao et al.

Summary: Ba2MgSi2O7:M (M = Bi3+, Sm3+, Sm3+/Bi3+) phosphors were synthesized in air by the high-temperature solid-state reaction method. The emission properties of these phosphors were investigated, and they exhibited different emission colors depending on the doping ions and their ratios. The luminous mechanism of the phosphors was explained by energy level diagrams of Bi3+ and Sm3+ ions in Ba2MgSi2O7:Sm3+, Bi3+.

JOURNAL OF MOLECULAR STRUCTURE (2023)

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Article Physics, Applied

Combustion synthesis of KZnPO4: RE (RE = Dy3+ and Sm3+) Phosphors for n-UV based w-LEDs

Chandrahasya M. Nandanwar et al.

Summary: KZnPO4:Dy3+ and KZnPO4:Sm3+ phosphors were synthesized using the Combustion technique and their XRD and photoluminescence properties were studied. The XRD confirmed the orthorhombic phase with the space group Pnma21. The synthesized KZnPO4:Dy3+ phosphor exhibited strong emission at 482 and 574 nm under 350 nm excitation, attributed to the electronic transitions of Dy3+ ions. The KZnPO4:Sm3+ phosphor showed prominent emission bands at 562 and 597 nm when excited at 402 nm. The CIE coordinates indicated high color purity of the phosphors, making them excellent candidates for n-UV-based w-LEDs.

EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS (2023)

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Article Chemistry, Physical

Luminescence properties, tunable emission and energy transfer of Na 3 Sc 2 (PO 4 ) 3: Sm 3+, Bi 3+phosphors

Renping Cao et al.

Summary: Na3Sc2(PO4)3:R (R = Bi3 +, Sm3 +, and Sm3 +/Bi3 +) materials were successfully synthesized in air atmosphere using the high-temperature solid-state reaction method. X-ray diffractometer patterns confirmed the single pure phase Na3Sc2(PO4)3 in all samples. Na3Sc2(PO4)3:Bi3 + exhibited blue emission due to the Bi3 + -Sc3 + metal-to-metal charge-transfer and the 3 P 1 & RARR;1S0 transition of Bi3 +. Na3Sc2(PO4)3:Sm3 + showed red-orange emission with four emission bands derived from the 4 G 5/2 & RARR;6H5/2, 6 H 7/2, 6 H 9/2, and 6 H 11/2 transitions of Sm3 +. The optimal concentrations of Sm3 + and Bi3 + were found to be -8mol% and -6mol%, respectively, in Na3Sc2(PO4)3:Sm3 +, Bi3 +. The energy transfer from Bi3 + to Sm3 + in Na3Sc2(PO4)3:Sm3 +, Bi3 + was verified by the spectral properties of the samples. The experimental results provide useful insights for the research of new Bi3 + and Sm3 + doped phosphors.

JOURNAL OF MOLECULAR STRUCTURE (2023)

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Article Chemistry, Analytical

Photoluminescence characteristics of novel Sm3+ ions-doped La1.4Al22.6O36 phosphor for n-UV w-LED

Ramkrushna M. Yerojwar et al.

Summary: The La1.4Al22.6O36:Sm3+ phosphors were synthesized using the combustion procedure. The XRD patterns revealed a hexagonal crystal structure. The maximum excitation intensity was obtained at 405 nm. Three different emission peaks at 573, 604, and 651 nm were observed under 405 nm excitation. Concentration quenching occurred at 1.5 mol% Sm3+ ions. The La1.4Al22.6O36 phosphor with Sm3+ doping exhibited a red emission at 604 nm (x = 0.644, y = 0.355) in the CIE coordinates. These findings suggest that the prepared phosphor could be used for developing w-light-emitting diodes.

LUMINESCENCE (2023)

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Article Environmental Sciences

Nitrous oxide and methane emissions from coffee agroforestry systems with different intensities of canopy closure

Yericho Berhanu et al.

Summary: This study investigated nitrous oxide (N2O) and methane (CH4) emissions in agroforestry systems with different canopy cover levels. The results showed that N2O emissions were two-to-three times greater with dense canopy cover compared to open-shade production, while CH4 emissions were lower in agroforestry systems. This study highlights the importance of considering canopy cover intensity in determining greenhouse gas emissions in agroforestry systems.

SCIENCE OF THE TOTAL ENVIRONMENT (2023)

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Article Nanoscience & Nanotechnology

Synthesis and Photoluminescence characterization of Sr3La(AlO)(3)(BO3)(4):Eu3+, Sm3+ Phosphor for n-UV w-LED

R. M. Yerojwar et al.

Summary: A red emitting Eu3+ doped Sr3La(AlO)(3)(BO3)(4) and Sm3+ doped Sr3La(AlO)(3)(BO3)(4) phosphors with high efficiency were synthesized and their photoluminescence properties were investigated. The morphology and chromaticity were studied using scanning electron microscopy and CIE analysis. The results showed that the phosphor had excitation ranges from 340 nm to 420 nm, with the strongest excitation located in the UV region for Eu3+ and Sm3+ doping, making it suitable for LED chips. Under n-UV light excitation, the phosphor emitted bright red light with main emission peaks at 617 nm and 602 nm, indicating excellent stability. These results highlight the importance of Sr3La(AlO)(3)(BO3)(4):Eu3+ and Sr3La(AlO)(3)(BO3)(4):Sm3+ red phosphors in white LEDs under n-UV excitation.

PHYSICS AND CHEMISTRY OF SOLID STATE (2023)

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Article Materials Science, Multidisciplinary

Combustion synthesized novel SrAlBO4:Eu3+phosphor: Structural, luminescence, and Judd-Ofelt analysis

R. T. Maske et al.

Summary: A series of new SrAlBO4 phosphor doped by Eu3+ was synthesized using the Combustion method. The structural and optical properties were studied using X-ray diffraction (XRD). The obtained phosphor showed irregular morphology and non-uniform structure. The luminescence properties of the phosphor were determined, showing characteristic emission bands corresponding to Eu3+ ions' transitions. The effect of different Eu3+ concentrations on the luminescence intensity was studied, and concentration quenching was explained using equations and theories. Judd-Ofelt analysis was performed on the photoluminescence emission spectra.

OPTICAL MATERIALS (2023)

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Article

Effect of alkali metal ions A+ (A = K+, Na+ and Li+) on the photoluminescence properties of Sr3Bi(PO4)3:Sm3+ phosphors prepared by wet chemical synthesis

C.M. Nandanwar et al.

Results in Optics (2023)

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Review Materials Science, Multidisciplinary

Luminescence properties of BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) orthophosphate phosphors for near-UV-based solid-state lighting

C. M. Nandanwar et al.

Summary: The BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) phosphors with different lanthanide ions were synthesized and their photoluminescence properties were studied. The BiPO4:Dy3+ phosphor emitted blue (481 nm) and yellow (575 nm) light under 352 nm excitation, attributed to the transitions of the Dy3+ ion. The BiPO4:Tb3+ phosphor showed efficient narrow green emission (545 nm) under 378 nm excitation due to a specific transition. The BiPO4:Sm3+ phosphor exhibited yellow, orange, and red emissions centered at 598 nm, attributed to the transition of the Sm3+ ion. The prepared phosphors exhibited high color purity based on the CIE coordinates. These findings suggest that BiPO4:Ln (Ln = Dy3+, Tb3+ and Sm3+) phosphors may have potential applications in near-UV-based solid-state lighting.

BULLETIN OF MATERIALS SCIENCE (2023)

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Article Physics, Multidisciplinary

Quasinormal Modes of AdS Black Strings

F. S. Mirekhtiary et al.

Summary: This paper studies the quasinormal modes of scalar waves of the black strings in asymptotically AdS spacetime and calculates the resonance modes analytically. Furthermore, it explores the connection between the mass transfer of black strings in the semi-classical limit and their highly damped oscillation frequencies. The Bohr-Sommerfeld quantization rule is utilized to extract the area and entropy spectra of the black strings using the transition frequency of the strongly damped quasinormal modes.

INDIAN JOURNAL OF PHYSICS (2023)

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Article Optics

Study on the luminescence properties and energy transfer of Na4CaSi3O9:Ce3+, Sm3+ phosphor

Renping Cao et al.

Summary: In this study, Na4CaSi3O9 phosphors doped with Ce3+, Sm3+, and Ce3+/Sm3+ were successfully synthesized under a reducing atmosphere using the high-temperature solid-state method. The crystal structure and luminescence properties of the samples were investigated, and the effects of different dopant ions on the emission spectra were studied. The results provide valuable insights for researching new Ce3+ and Sm3+ co-doped phosphors, and the emission mechanisms were explained using energy level diagrams of Ce3+ and Sm3+ ions.

JOURNAL OF LUMINESCENCE (2022)

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Article Chemistry, Analytical

Wet chemical synthesis of BiPO4:Eu3+ phosphor for w-LED application

Chandrahasya M. Nandanwar et al.

Summary: The synthesis of BiPO4:Eu3+ phosphors was successfully achieved using a wet chemical process. X-ray diffraction patterns confirmed good matching between the prepared samples and the standard BiPO4 structure. The highest excitation intensity was observed at 395 nm, leading to characteristic emission peaks at 592 nm and 616 nm. Concentration quenching occurred at a Eu3+ ion concentration of 0.5 mol%. The particles had a micrometre size range. The prepared phosphor shows potential for use in white light-emitting diodes.

LUMINESCENCE (2022)

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Article Nanoscience & Nanotechnology

Synthesis and Photoluminescence Properties of Ca5(PO4)3F: Ln (Ln: Dy3+, Eu3+ and Sm3+) Phosphors for near UV-based solid state lighting

C. M. Nandanwar et al.

Summary: The wet chemical synthesis of Ca-5(PO4)(2)F host doped with lanthanide ions Dy3+, Eu3+ and Sm3+ was investigated. The structural and photoluminescence properties were studied, and the results showed that these phosphors can emit different colors of light under different excitation wavelengths, making them potential materials for near UV-based solid-state lighting.

PHYSICS AND CHEMISTRY OF SOLID STATE (2022)

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Article Optics