Nanostructured hybrid films containing nanophosphor: Fabrication and electronic spectral properties

Camacho, Sabrina A.; Aoki, Pedro H.B.; Constantino, Carlos J. L.; Aroca, Ricardo F.; Pires, Ana Maria

doi:10.1016/j.jallcom.2012.06.103

Cited by 13 publications

(13 citation statements)

References 61 publications

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“…The 2000–3000 cm −1 spectral profile is consistent with the photoluminescent transitions of lanthanides [49,50]. Thus, it is probable that the structural distortion imposed by the Er 3+ concentration changes and induces the appearance of the observed photoluminescent signals at different Ba/Ti ratios.…”

Section: Discussionsupporting

confidence: 71%

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Meneses-Franco¹,

Campos‐Vallette

Vásquez

et al. 2018

Materials

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Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er3+ ions were introduced into the BaTiO3 lattice by the sol-gel method. The resulting Er3+ concentration was between 0% and 5%, with Ba/Ti ratios of 1.008 and 0.993. The stoichiometry of Ba and Ti concentrations in the lattice influenced the doping mechanism and placement of erbium ions in the lattice structure. Our research shows the existence of a strong correlation between Ba/Ti ratios, erbium concentration, phase structure and doping site location on the upconversion photoluminescence mechanisms. Competing upconversion emissions 2H11/2/4S3/2→4I15/2 at 523 and 548 nm respectively and other photoluminescent mechanisms as 4I9/2→4I11/2 around 4000 nm (2500 cm−1) were studied using Raman and emission spectroscopy. The upconversion process is predominant over other photoluminescent decay when the material presents high distortion in the surrounding activator.

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Section: Discussionsupporting

confidence: 71%

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Meneses-Franco¹,

Campos‐Vallette

Vásquez

et al. 2018

Materials

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“…[13][14][15] Also, some other methods such as hydrothermal and Pechini's methods are used for the preparation of LaF 3 and Y 2 O 3 nanoparticles. 16,17 Among the oxide phosphors, YPO 4 has a large indirect band gap (∼8.6 eV), high dielectric constant (∼7-10), optically isotropic with a refractive index (∼1.72), high melting point (∼1600 • C) and small phonon energy (∼1080 cm -1 ). [18][19][20][21][22] Such small vibration energy is a good choice of the host materials and will allow for effective radiative transitions between electronic energy levels of the rare earth ions in YPO 4 host.…”

Section: Introductionmentioning

confidence: 99%

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Parchur¹,

Prasad²,

Bahadur³

et al. 2012

AIP Advances

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This article explores the tuning of blue to pink colour generation from Li+ ion co-doped YPO4:5Eu nanoparticles prepared by polyol method at ∼100-120 °C with ethylene glycol (EG) as a capping agent. Interaction of EG molecules capped on the surface of the nanoparticles and/or created oxygen vacancies induces formation of intermediate/mid gap bands in the host structure, which is supported by UV-Visible absorption data. Strong blue and pink colors can be observed in the cases of as-prepared and 500 °C annealed samples, respectively. Co-doping of Li+ enhances the emission intensities of intermediate band as well as Eu3+. On annealing as-prepared sample to 500 °C, the intermediate band emission intensity decreases, whereas Eu3+ emission intensity increases suggesting increase of extent of energy transfer from the intermediate band to Eu3+ on annealing. Emission intensity ratio of electric to magnetic dipole transitions of Eu3+ can be varied by changing excitation wavelength. The X-ray photoelectron spectroscopy (XPS) study of as-prepared samples confirms the presence of oxygen vacancies and Eu3+ but absence of Eu2+. Dispersed particles in ethanol and polymer film show the strong blue color, suggesting that these materials will be useful as probes in life science and also in light emitting device applications

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“…Other investigations involving thin films, MOFs and coordination polymers have been reported in the literature [18,63,73,78,88,94,133,141,169,178,182,185,201,.…”

Section: Thin Films Metal-organic Framework and Coordination Polymersmentioning

confidence: 99%

“…Other investigations on the luminescence properties of lanthanide-based systems with NPs, nanorods or systems assembled using sol-gel techniques have been reported in the literature [17,22,27,33,34,38,40,43,45,49,50,60,61,67,73,78,82,88,93,107,[127][128][129]133,136,140,142,143,149,163,[169][170][171]176,178,201,211,212,214,[235][236][237][238][239][240][241][242][243][244][245]…”

Section: Nanoparticles Nanorods and Sol-gel Processmentioning

confidence: 99%

Recent advances in lanthanide spectroscopy in Brazil

Silva

Capelo

Albuquerque

2016

Journal of Luminescence

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a b s t r a c tThis rev Q2 iew discusses recent advances in lanthanide spectroscopy involving luminescence applications carried out in Brazil. The revised topics include glasses, sol-gel, light-emitting diodes, nanoparticles, metal-organic frameworks, coordination polymers, thin films, energy transfer processes, upconversion and development of new theoretical tools. The important role played by Prof. Oscar L. Malta on this subject is evidenced by his many contributions to the broad range of investigations reported here and this review is dedicated to him, on the occasion of his 60th birthday.& 2015 Published by Elsevier B.V.

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Nanostructured hybrid films containing nanophosphor: Fabrication and electronic spectral properties

Cited by 13 publications

References 61 publications

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Recent advances in lanthanide spectroscopy in Brazil

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