Characterization of europium doped lanthanum oxide films prepared by spray pyrolysis

Medina, Dulce Y.; Orozco, S.; Hernández, Ignacio Colomer; Hernández, Raquel Trujillano; Falcony, C.

doi:10.1016/j.jnoncrysol.2011.07.021

Cited by 22 publications

(13 citation statements)

References 30 publications

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“…The interpretation of the spectra turns out to be easy because of the small number of possible crystal-field transitions. Other interesting characteristics refer to the facts that, because the different 5 D 0 → 7 F J lines are well separated, overlapping between the crystal-field levels is difficult [ 11 ] and that the luminescence intensity ratio of the magnetic ( 5 D 0 → 7 F 1 ) and electric bands ( 5 D 0 → 7 F 2 ), both in the red range of the spectrum, shows a larger symmetry factor with a larger symmetry of local crystal fields [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Luminescent Properties of Eu3+-Doped Hybrid SiO2-PMMA Material for Photonic Applications

et al. 2018

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Hybrid organic-inorganic materials are of great interest for various applications. Here, we report on the synthesis and optical characterization of silica-PMMA samples with different Eu3+ molar concentrations. The optical properties of this material make it suitable for photonic applications. The samples were prepared using the sol-gel method, mixing tetraethyl orthosilicate (TEOS) as a silica glass precursor and methyl methacrylate (PMMA) as a polymer component. Europium nitrate pentahydrate was then added in six different molar concentrations (0.0, 0.1, 0.25, 0.5, 0.75, and 1%) to obtain as many different samples of the material. The absorption spectra were obtained applying the Kubelka–Munk formula to the diffuse reflectance spectra of the samples, all in the wavelength range between 240 and 2500 nm. The emission and excitation measurements were made in the visible range. Five bands could be identified in the emission spectra, related to electronic transitions of the ion Eu3+ (4D0→7Fi, i from 0 to 4). In the excitation spectra, the following bands were detected: 7F0→5G3 (379 nm), 7F0→5G2 (380 nm), 7F0→5L6 (392 nm), 7F0→5D3 (407 nm), 7F0→5D2 (462 nm), and 7F0→5D1 (530 nm). The emission decay times were measured for the different samples and showed an inverse dependence with the Eu3+ concentration.

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Section: Introductionmentioning

confidence: 99%

Luminescent Properties of Eu3+-Doped Hybrid SiO2-PMMA Material for Photonic Applications

et al. 2018

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“…When the molar ratio of PVP/Lu increases, the intensity of 5 D0 → 7 F2 transition also increases and reaches the maximum when the PVP/Lu = 4.0. Subsequently, the red luminescent intensity decreases inversely due to PVP concentration quenching, confirming that the incorporation of PVP changes the structure as shown in Figure 6 and The band at 610 nm is attributed to Eu 3+ electric dipole transition 5 D 0 → 7 F 2 , as observed in Table 1, and the ratio R (called as the asymmetry ratio gives a measure of the degree of distortion from the inversion symmetry of the local environment of the Eu 3+ ion in matrix) [44] between the intensities I( 5 D 0 → 7 F 2 )/I( 5 D 0 → 7 F 1 ) [45] was enhanced when the incorporation of PVP was increased. This is due to the enhancement of 5 D 0 → 7 F 2 which is for the magnetic dipole transition 5 D 0 → 7 F 1 is not sensitive to the changes in the neighborhood of the Eu 3+ ion while the electric dipole transition 5 D 0 → 7 F 2 is very sensitive to any structural change [46].…”

Section: Morphology Of Thin Filmsmentioning

confidence: 94%

Luminescence Properties of Co-Doped Eu3+, Bi3+ Lu2O3/Polyvinylpyrrolidone Films

et al. 2018

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The effect of the polyvinylpyrrolidone (PVP, MW = 130,000) molar content, PVP/Lu = 1, 2.5, 4 and 5; on the photoluminescent and structural properties of sol-gel derived Lu2O3:Eu3+, Bi3+ has been analyzed. Thin hybrid films were deposited by means of the dip-coating technique on silica quartz substrates. Films deposited at 700 °C presented a cubic structure, with non-preferential orientation, even with the presence of PVP. The photoluminescence (PL) spectrum and Comission Internationale de l’Éclairage (CIE) chromaticity diagram of films revealed a reddish Eu3+ emission at 612 nm (5D0 →7F2) with an excitation at 320 nm of the Bi ions (6s2→6s6p), showing a highly-effective energy transfer process form Bi3+ to Eu3+ luminescent centers. On the other hand, the color temperature of the samples is strongly dependent on the PVP content, as a consequence of the observed difference on the branching ratios of 5D0 →7FJ transitions of europium ions. Lifetime studies present two different behaviors for the thin films: A non-exponential nature for the lower PVP contents, and a simple exponential nature for the highest PVP one, showing that the PVP tends to promote a better dissolution of segregates and, therefore, increases the lifetime of the Eu3+ emission.

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“…The method is used for deposition of thin ferrite films [50], thin films of the perovskite LaFeO 3 [51], thin films of TiO 2 (pure or modified) [52][53][54][55], films of poly-(methyl)methacrylate [28], and thin films of cerium-doped yttrium-iron garnet [56], each of them with potential applications in water purification, oxygen sensing, thermosensors, for deposition of thin yttria-stabilized zirconia films [1,57,58], for crystalline and non-crystalline iron oxide (α-Fe 2 O 3 ) thin films onto glass substrates at different temperatures [59,60], highly structured ZnO layers [61], transparent conducting zinc oxide thin films [62], lead(II) oxide thin films [63], nanoporous aluminum oxide [64], europium doped lanthanum oxide films [65], and UV excited green emitting Eu(II) activated BaAl 2 O 4 and SrAl 2 O 4 [66] and etc. Typical spray pyrolysis equipment consists of an atomizer, precursor solution, substrate heater, and temperature controller.…”

Section: Spray Pyrolysis Methods For Film Productionmentioning

confidence: 99%

Thin Films for Immobilization of Complexes with Optical Properties

Zaharieva¹,

Milanova²

2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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Thin film deposition techniques, such as dip coating, spin coating, and spray pyrolysis, are applied for the production of SiO 2 -, poly-(methylmethacrylate) (PMMA)-, and SiO 2 -/polyester-based "hybrid" matrices. The factors influencing the film properties are briefly discussed. The morphology of the films presented is studied by different microscopy techniques such as atomic force microscopy, electron (scanning and transmission) microscopy, and fluorescence microscopy. The composites based on SiO 2 -, PMMA-, and SiO 2 /polyster "hybrid" matrices possess the optical properties of the immobilized complexes of Ru(II) and Eu(III) with different organic ligands. The preparation of the PMMA matrix by the monomer methylmethacrylate polymerization (instead of using of PMMA solution) caused partial destruction of the less stable complexes and thereby a decrease in the fluorescence intensity.

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Characterization of europium doped lanthanum oxide films prepared by spray pyrolysis

Cited by 22 publications

References 30 publications

Luminescent Properties of Eu3+-Doped Hybrid SiO2-PMMA Material for Photonic Applications

Luminescent Properties of Eu3+-Doped Hybrid SiO2-PMMA Material for Photonic Applications

Luminescence Properties of Co-Doped Eu3+, Bi3+ Lu2O3/Polyvinylpyrrolidone Films

Thin Films for Immobilization of Complexes with Optical Properties

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