Cerium‐Activated Halophosphate Phosphors: I . Strontium Fluoroapatites

Pappalardo, R.; Walsh, John R.; Hunt, R.B.

doi:10.1149/1.2119528

Cited by 38 publications

(14 citation statements)

References 5 publications

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“…3), measured in the 200-750 nm region at room temperature (RT), consists of bands at 400,417, 462, 526 and 580 nm (from 350 nm a dramatical rise in the optical density is observed). These bands are due to Mn 2+ and can be related (Table 5) to the 6S --~ 4G(Eg),4G(Alg), 4G(T2g),4G(Tlg) transitions of this ion, in the cubic symmetry approximation (Aguilar and Osendi, 1982;Pappalardo et al, 1983). Fig.…”

Section: Resultsmentioning

confidence: 98%

New structural and spectroscopic data for eosphorite

et al. 1993

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X-ray diffraction refinement of the crystal structure of eosphorite has been carried out with reference to the orthorhombic space group Cmca. The structure is similar to that previously described by Hanson (1960), but the standard deviations are improved. Optical absorption and photoluminescence have also been studied for this mineral. Two sharp emission lines, denoted as RI and R2, superimposed to a broad band (630-750 nm) have been related to the presence of Cr 3+ ions. The excitation spectrum of these emissions confirms that the absorption (excitation) bands centred at 431 nm and 585 are related to with 4A 2 --~ 4T 1 and 4A 2 --> 4T 2 spin allowed transitions of this ion.

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Section: Resultsmentioning

confidence: 98%

New structural and spectroscopic data for eosphorite

et al. 1993

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“…10,11 In the last decade, much effort has been devoted to the investigation of the luminescent properties of fluorapatite FAP doped with rare earth (RE) or transition metal ions such as Ca 5 (PO 4 ) 3 X:Sb 3+ ,Mn 2+ , and many metal-doped FAP with interesting spectroscopic properties were found. [12][13][14][15][16] However, the self-activated luminescence, the electronic structure and orbital population of FAP have not been reported in FAP samples. In addition, the combination of the self-activated luminescence and rare earth-doping emission might lead to new properties and applications for the calcium fluorapatite.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis, electronic structure and tunable luminescence of single-phase Ca₅(PO₄)₃F:Tb³⁺,Eu³⁺microrods

Wang

Yang

et al. 2014

Dalton Trans.

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Uniform and well-crystallized calcium fluorapatite [Ca5(PO4)3F, FAP] microrods have been successfully synthesized by a facile one-step hydrothermal synthesis method using sodium citrate as the crystal modifier. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), photoluminescent excitation spectra (PLE) and decay studies were employed to characterize the samples. The electronic structure and orbital population of FAP were also determined by means of density functional theory calculations. Under ultraviolet irradiation, the FAP:Tb(3+),Eu(3+) samples exhibit a blue-light emission of the host matrix, as well as the typical green emission band of the Tb(3+) ions, and a red-light emission of Eu(3+). The highly intense red emission bands of the Eu(3+) ions were attributed to the effective energy transfer from the Tb(3+) to Eu(3+) ions, which has been justified through the luminescence spectra and the fluorescence decay dynamics. The luminescence colors of FAP:Tb(3+),Eu(3+) microrods can be easily tuned by changing the concentration of Eu(3+) ions. The results reveal that the combination of the self-activated luminescence and rare earth-doping emission in FAP:Tb(3+),Eu(3+) microrods could result in tunable emission in a large color gamut, which can be used as a potential candidate for white-light-emitting diodes and other display devices.

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“…The incorporation of dopant in the HAP structure contributes to increasing a range of potential applications in fields such as water purification, bone pathologies, bioceramics, catalysis, and luminescence [18]. For example, it is reported that Sb 3+ -doped HAP has useful applications in fluorescent lamps [19]. Cr 3+ was incorporated as a dopant in the material with the aim of developing a biosensor [20].…”

Section: Introductionmentioning

confidence: 99%

Atomistic Simulation of Intrinsic Defects and Trivalent and Tetravalent Ion Doping in Hydroxyapatite

Santos

Rezende

2014

Advances in Condensed Matter Physics

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Atomistic simulation techniques have been employed in order to investigate key issues related to intrinsic defects and a variety of dopants from trivalent and tetravalent ions. The most favorable intrinsic defect is determined to be a scheme involving calcium and hydroxyl vacancies. It is found that trivalent ions have an energetic preference for the Ca site, while tetravalent ions can enter P sites. Charge compensation is predicted to occur basically via three schemes. In general, the charge compensation via the formation of calcium vacancies is more favorable. Trivalent dopant ions are more stable than tetravalent dopants.

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Cerium‐Activated Halophosphate Phosphors: I . Strontium Fluoroapatites

Cited by 38 publications

References 5 publications

New structural and spectroscopic data for eosphorite

New structural and spectroscopic data for eosphorite

Hydrothermal synthesis, electronic structure and tunable luminescence of single-phase Ca₅(PO₄)₃F:Tb³⁺,Eu³⁺microrods

Atomistic Simulation of Intrinsic Defects and Trivalent and Tetravalent Ion Doping in Hydroxyapatite

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Cerium‐Activated Halophosphate Phosphors: I . Strontium Fluoroapatites

Cited by 38 publications

References 5 publications

New structural and spectroscopic data for eosphorite

New structural and spectroscopic data for eosphorite

Hydrothermal synthesis, electronic structure and tunable luminescence of single-phase Ca5(PO4)3F:Tb3+,Eu3+microrods

Atomistic Simulation of Intrinsic Defects and Trivalent and Tetravalent Ion Doping in Hydroxyapatite

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Hydrothermal synthesis, electronic structure and tunable luminescence of single-phase Ca₅(PO₄)₃F:Tb³⁺,Eu³⁺microrods