Studies on luminescence properties and energy transfer in Ce/Dy co-doped CaS nano-phosphors

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

doi:10.1016/j.jlumin.2012.04.052

Cited by 11 publications

(2 citation statements)

References 30 publications

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“…21−25 In comparison with the well-established research on bulk CaS phosphors, little has been achieved in the synthesis and optical investigation of nanocrystal CaS hosts, which are expected to provide expanded spectrum tunability and application range of the materials. 26,27 Early syntheses of CaS nanophosphors typically yielded nonuniform nanocrystals with large sizes of over 30 nm and relatively poor dispersibility. 2,10,11,28,29 In 2019, Chen and co-workers developed a coprecipitation synthesis of CaS nanocrystals in organic solvents composed of oleic acid (OA), oleylamine (OM), and trioctylamine (TOA).…”

Section: ■ Introductionmentioning

confidence: 99%

“…In comparison with the well-established research on bulk CaS phosphors, little has been achieved in the synthesis and optical investigation of nanocrystal CaS hosts, which are expected to provide expanded spectrum tunability and application range of the materials. , Early syntheses of CaS nanophosphors typically yielded nonuniform nanocrystals with large sizes of over 30 nm and relatively poor dispersibility. ,,,, In 2019, Chen and co-workers developed a coprecipitation synthesis of CaS nanocrystals in organic solvents composed of oleic acid (OA), oleylamine (OM), and trioctylamine (TOA). Colloidal CaS nanocrystals with uniform size (around 20 nm) and spherical morphology were obtained, giving rise to various technological applications such as H 2 O 2 detection (CaS:Ce/Er) and bioimaging (CaS:Eu/Sm). , Despite the encouraging results, an accurate understanding of luminescence processes in these small-sized crystals has not yet been established.…”

Section: Introductionmentioning

confidence: 99%

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Doping-Mediated Size and Structure Tailoring of CaS Nanocrystals

et al. 2022

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Lanthanide-doped CaS crystals are extensively studied as lightemitting materials, but the investigation of CaS nanocrystals is largely lagging. This work reports a doping-induced modification of surface charge density and the local coordination environment in CaS:Ce nanocrystals, which offers precise control over the nanocrystal size (39−14 nm) and emission color (green to yellow). Our mechanistic investigations, corroborated by theoretical calculations, reveal a Senriched nanocrystal surface that accommodates excess charges of the aliovalent lanthanide dopants. Owing to the altered surface structure, we identify a dark Ce state that selectively extinguishes light emission of the CaS:Ce nanocrystals. We demonstrate that the doping-induced surface effects can be offset by coating the CaS:Ce nanocrystals with an undoped CaS shell, giving rise to a shell-thickness-dependent emission. Our findings suggest that nanocrystals may respond differently to impurity dopants than the corresponding bulk crystals, thereby giving rise to extended control over materials properties for applications such as optical encryption.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Doping-Mediated Size and Structure Tailoring of CaS Nanocrystals

et al. 2022

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Green Emitting Cerium Doped CaS Whiskers Grown by Solid State Diffusion Method

Rekha

Anila²

2018

J Fluoresc

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Undoped and cerium doped Calcium sulfide (CaS) phosphors were synthesized using solid state diffusion method. The X-ray diffraction pattern revealed that both undoped and doped CaS crystallites have cubic structure with average crystallite size varying from 20 to 30 nm. Scanning electron micrographs indicated that Ce doped CaS phosphors were composed of whiskers with different dimensions and orientations. The optical properties of undoped and Ce doped particles were characterized using Photoluminescence (PL) and UV-Vis absorption spectroscopy. The PL emission spectrum of cerium doped CaS phosphors for an excitation wavelength 465 nm showed a main peak at 500 nm and a shoulder peak at 556 nm due to 5d → 4f transition in Ce ions. The variation of PL intensity with cerium concentration was investigated and the maximum PL intensity was obtained for a doping concentration of 3 wt.%. The optical band gap of the samples was estimated from the diffuse reflectance spectrum and was found to increase with increase in cerium concentration. The enhanced optical properties of these phosphors can be exploited in various optoelectronic devices including displays and bioimaging techniques.

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Luminescence properties of Dy3+ doped and Dy3+/Ce3+co-doped CaO–Al2O3–SiO2–B2O3 glass for LED applications

Zhang

Zhu

et al. 2015

Ceramics International

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Studies on luminescence properties and energy transfer in Ce/Dy co-doped CaS nano-phosphors

Cited by 11 publications

References 30 publications

Doping-Mediated Size and Structure Tailoring of CaS Nanocrystals

Doping-Mediated Size and Structure Tailoring of CaS Nanocrystals

Green Emitting Cerium Doped CaS Whiskers Grown by Solid State Diffusion Method

Luminescence properties of Dy3+ doped and Dy3+/Ce3+co-doped CaO–Al2O3–SiO2–B2O3 glass for LED applications

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