Effect of Trivalent Rare Earth Doping in Cadmium Silicates Hosts: A Theoretical Study

Freire, Eduily Benvindo Vaz; Santos, Anderson Lira de Sales; Bispo, Giordano Frederico da Cunha; Macedo, Zélia Soares; Jackson, Robert A.; Valério, Mário E.G.

doi:10.2139/ssrn.4054614

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“…Na estrutura, cada Cd 2+ se encontra rodeado por seis oxigênios formando octaedros distorcidos, arranjados em placas paralelas [010] separados entre si pelas cadeias simples de SiO4 tetraédricos, figura 12 [36] Figura 12. Estrutura do CdSiO3 adaptado de [40].…”

Section: Silicato De Cádmiounclassified

Síntese e caracterização de silicato de cádmio dopado com íons de metais de transição e ou Terras Raras para obtenção de materiais com luminescência persistente

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Materials with persistent luminescence are materials that emit light for long periods of time after the excitation is ceased. Knowing factors that influence luminescence, both in color and duration, are extremely important to adjust this property according to the application. Thus, to study the effects on luminescence the synthesis of cadmium metasilicate (CdSiO3) with different synthetic methods was proposed. The methods were molten precursor, hydrothermal and sol-gel. Changes in the synthesis conditions were carried out in the pH and calcination temperature. Dopings with manganese, praseodymium and terbium were also carried out. The resulting materials obtained were analyzed by X-ray diffraction (XRD), nitrogen adsorption (BET). Emission and excitation spectra were obtained, as well as lifetime measurements. Doped and undoped materials were obtained in acidic medium and confirmed by diffractometry, whereas in the basic medium it was only possible to obtain them with good purity by the sol-gel method at 800ºC. The samples have crystallite sizes varying between 20 and 31 nm, with non-doped samples ranging from 27-31 nm. Nitrogen adsorption shows samples with large surface area for those obtained by the sol-gel method, while in the hydrothermal method there appears to be a relationship with temperature, possibly due to precursor particle size. The emission spectra show different scenarios for undoped samples obtained, possibly due to the types of defects formed. Manganese doping leads to a shift in the emission wavelength, while samples with praseodymium showed changes in the relative intensity of transition peaks, which may be associated with changes in the crystal lattice due to synthetic pathways. The samples with the longest lifetime were obtained with the hydrothermal method, followed by sol-gel and finally the molten precursor method. The highest intensity was obtained by the hydrothermal method followed by calcination; at 800ºC.

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Section: Silicato De Cádmiounclassified

Síntese e caracterização de silicato de cádmio dopado com íons de metais de transição e ou Terras Raras para obtenção de materiais com luminescência persistente

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Effect of Trivalent Rare Earth Doping in Cadmium Silicates Hosts: A Theoretical Study

Cited by 1 publication

References 25 publications

Síntese e caracterização de silicato de cádmio dopado com íons de metais de transição e ou Terras Raras para obtenção de materiais com luminescência persistente

Síntese e caracterização de silicato de cádmio dopado com íons de metais de transição e ou Terras Raras para obtenção de materiais com luminescência persistente

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