Luminescence properties of CaS:Ce, Sm nanophosphors

Sharma, Geeta; Lochab, S.P.; Singh, Nafa

doi:10.1016/j.physb.2011.03.008

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…Four strong emission peaks are observed at 485, 548, 582, and 612 nm, due to Tb 3+ electronic transitions 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 , respectively . The most intense peak is observed at 548 nm (green region), which is in good agreement with previously reported results. − …”

Section: Resultssupporting

confidence: 91%

Crystal Growth of Quaternary AkRE₂Si₂S₈ (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties

Panigrahi,

Berseneva,

Morrison

et al. 2024

Inorg. Chem.

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We report on the detailed structural analysis of a series of 11 new quaternary rare earths containing thiosilicates, AkRE 2 Si 2 S 8 (Ak = Ca and Sr; RE = La, Ce, Pr, Nd, Sm, Gd, and Tb), synthesized using the flux-assisted boron chalcogen mixture method. High quality crystals were grown and used to determine their crystal structures by single crystal X-ray diffraction. All members of the AkRE 2 Si 2 S 8 series crystallize in the trigonal crystal system with space group R3̅ c (space group no. 167). Polycrystalline powders were used for physical property measurements, including magnetic susceptibility, diffuse reflectance in the UV−visible range, and scintillation. Magnetic measurements indicated that CaRE 2 Si 2 S 8 (RE = Nd and Tb) exhibits paramagnetic behavior with a slightly negative Weiss constant. The band gaps of the materials were determined from diffuse reflectance data, and optical band gaps were estimated to be 2.5(1) and 2.9(1) eV for CaCe

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Section: Resultssupporting

confidence: 91%

Crystal Growth of Quaternary AkRE₂Si₂S₈ (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties

Panigrahi,

Berseneva,

Morrison

et al. 2024

Inorg. Chem.

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“…It is observed that all samples exhibit a broad PL emission band with an emission maximum at 478 nm. This broad peak is due to the occurrence of intrinsic point defects like sulphur vacancies, calcium vacancies, and various other defects in the CaS host lattice [16][17][18][19][20]. On exciting the sample with wavelength 390 nm, excitation occurs to the various defect levels, and from these defect levels, radiative emission takes place, giving rise to the broad peak.…”

Section: Pl Studiesmentioning

confidence: 99%

Structural, Luminescence and Cytotoxicity Studies of PEG Capped CaS Nanophosphors

Rekha¹,

Aravind²,

Venkidesh³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Nanoparticles have remarkable applications in medical imaging and therapy owing to their enhanced optical, electronic, and structural properties. One of the challenges in nanoparticle application in the medical field is that when injected into the bloodstream, they are taken by the reticuloendothelial system (RES) of the body and removed by circulation. To avoid RES capture and protect them from the immune system, surface passivation of the nanoparticle is done with polyethylene glycol (PEG). The wet chemical synthesis of Calcium sulfide (CaS) nanophosphors capped with various concentrations of PEG is reported here. The structural and optical properties of the samples were studied by X-ray diffractogram (XRD), scanning electron microscopy (SEM), photoluminescence (PL) spectrum, and diffuse reflectance spectrum (DRS). The cell viability of the nanoparticles was estimated from the MTT assay using L929 human fibroblast cells. The cytotoxicity analysis revealed that PEG-capped CaS is biocompatible, which ensures the possibility of their prospective applications in the biomedical field.

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“…Recently, protective coatings of luminescent particles were successfully applied to enhance the stability of these sulfide materials [3,4,5]. Particularly vivid are the studies on binary sulfides [6,7,8,9,10,11], thiogallates [12,13,14,15] and thiosilicates [16,17,18,19,20,21,22,23,24,25]. The thiosilicates are, in many practical aspects, comparable to the thiogallates, but considering the depletion of certain natural resources, silicon is to be preferred over gallium, since it is far more abundant and cheaper.…”

Section: Introductionmentioning

confidence: 99%

Broadband Luminescence in Rare Earth Doped Sr2SiS4: Relating Energy Levels of Ce3+ and Eu2+

2013

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Sr2SiS4:Ce3+ is an efficient blue-emitting (460 nm) phosphor, excitable with light of wavelengths up to 420 nm. From the excitation spectrum, we construct the energy level scheme and use it to check the predictive power of the Dorenbos model, relating the positions of the Ce3+ energy levels with those of Eu2+ in the same host. For strontium thiosilicate, this method gives excellent results and allows us to determine which of two available crystallographic sites is occupied by cerium. We use the Dorenbos method for extracting information on the coordination of Ce3+ from the observed crystal field splitting.

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Luminescence properties of CaS:Ce, Sm nanophosphors

Cited by 11 publications

References 28 publications

Crystal Growth of Quaternary AkRE₂Si₂S₈ (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties

Crystal Growth of Quaternary AkRE₂Si₂S₈ (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties

Structural, Luminescence and Cytotoxicity Studies of PEG Capped CaS Nanophosphors

Broadband Luminescence in Rare Earth Doped Sr2SiS4: Relating Energy Levels of Ce3+ and Eu2+

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Luminescence properties of CaS:Ce, Sm nanophosphors

Cited by 11 publications

References 28 publications

Crystal Growth of Quaternary AkRE2Si2S8 (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties

Crystal Growth of Quaternary AkRE2Si2S8 (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties

Structural, Luminescence and Cytotoxicity Studies of PEG Capped CaS Nanophosphors

Broadband Luminescence in Rare Earth Doped Sr2SiS4: Relating Energy Levels of Ce3+ and Eu2+

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Product

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Crystal Growth of Quaternary AkRE₂Si₂S₈ (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties

Crystal Growth of Quaternary AkRE₂Si₂S₈ (Ak = Ca and Sr; RE = La–Tb) Thiosilicates Using Flux-Assisted Boron Chalcogen Mixture Method: Exploring X-ray Scintillation, Luminescence, and Magnetic Properties