STRONG 1. 53 μm LUMINESCENCE FROM ERBIUM-CONTAINING NANOCLUSTERS IN SOL-GEL DERIVED OXIDE FILMS

Гапоненко, Н. В.; Mudryi, A. V.; Sergeev, Oleg; Борисенко, В. Е.; Степанова, Е. А.; Baran, Anna; Ратько, А. И.; Baran, S. V.; McGilp, J. F.

doi:10.1142/9789814503938_0034

Physics, Chemistry and Application of Nanostructures 1997

DOI: 10.1142/9789814503938_0034

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STRONG 1. 53 μm LUMINESCENCE FROM ERBIUM-CONTAINING NANOCLUSTERS IN SOL-GEL DERIVED OXIDE FILMS

Н. В. Гапоненко

A. V. Mudryi

Oleg Sergeev

et al.

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“…8 Previously, the formation of sol-gel derived erbium-doped SiO 2 , Al 2 O 3 , In 2 O 3 , and Fe 2 O 3 films, with stable luminescence revealed at 1.53 m, even at room temperature, has been reported. [22][23][24][25] The mesoporous architecture provides strong fastening of the xerogel to the pore walls and, with a suitable film thickness, sufficient luminescent centers. Further porous anodic alumina, exhibiting a regular pore morphology, with pores at the centers of approximately hexagonal cells, 26 is considered to be an effective template for fabricating the luminescent xerogels.…”

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confidence: 99%

Optical and Structural Characterization of Erbium-Doped TiO[sub 2] Xerogel Films Processed on Porous Anodic Alumina

Гапоненко

Sergeev

Степанова

et al. 2001

J. Electrochem. Soc.

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Titania films, doped with erbium, were fabricated on porous anodic alumina from a normalTifalse(OC2H5)4 precursor. The samples, subjected to thermal processing up to 1270 K, exhibited strong luminescence at 1.53 μm associated with 4I13/2→4I15/2 transitions of Er3+ ions in the TiO2 xerogel. The intensity of photoluminescence increased with the number of xerogel film depositions onto alumina. Secondary ion mass spectrometry analyses show that the pores of anodic alumina are filled by the xerogel after sequential spinning of ten layers. Cooling of the samples to 4.2 K gives enhancement of the intensity of the Er-related band at 1.53 μm and narrowing of the full width at half maximum from 20 to 10 nm. © 2001 The Electrochemical Society. All rights reserved.

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Optical and Structural Characterization of Erbium-Doped TiO[sub 2] Xerogel Films Processed on Porous Anodic Alumina

Гапоненко

Sergeev

Степанова

et al. 2001

J. Electrochem. Soc.

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“…This is realized through either increase of lanthanide concentration in the xerogel or by increase in the amount of xerogel per unit area by building up multiple layers of the xerogel. 7,21 For xerogel/PAA systems, 7,22 increase in the amount of optical centers may be achieved readily with increase of porous layer thickness. 8 Interestingly, however, simple increase of the amount of xerogel in the alumina pores has contrasting effects on the PL intensity; both enhancement 7 and reduction 8 of lanthanide PL was observed for PAA containing several titania-based sol-gel films.…”

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confidence: 99%

Luminescence from Sol-Gel-Derived Europium-Doped Films Confined in Mesoporous Anodic Alumina

Молчан

Гапоненко

Kudrawiec

et al. 2004

J. Electrochem. Soc.

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Photoluminescence ͑PL͒ properties of the structure porous anodic alumina ͑PAA͒/europium-doped xerogel film have been investigated with respect to the xerogel content (TiO 2 , Al 2 O 3 , In 2 O 3 ), its transmittance and PL excitation wavelength. Three mechanisms of lanthanide optical excitation in the structure are proposed: ͑i͒ excitation through the PAA matrix; (ii) excitation through the xerogel matrix that depends on its transparency and, in turn, on xerogel content and thickness within the porous morphology; and (iii) direct excitation of a lanthanide ion due to the relative transparency of both the PAA and xerogel films. It is speculated that exploiting PAA allows significant change in the excitation conditions of lanthanides, probably due to multiple scattering of the exciting light, which is the main reason for the reported PL enhancement of lanthanides from the structure compared with similar PAA/lanthanide-doped xerogel films fabricated on flat substrates.The sol-gel method attracts much attention as an alternative low cost technology for fabrication of a variety of materials. The applications of sol-gel synthesis vary from low temperature methods for fabrication of glasses to creation of optical waveguides and laser sources. The process allows fabrication of homogeneous inorganic oxide materials with desirable properties, such as optical transparence, porosity, hardness, and chemical and thermal resistance. The sol-gel reaction involves the evolution of a colloidal suspension ͑sol͒ to a network in a continuous liquid phase ͑gel͒ that is transformed into a glass-like solid ͑xerogel͒ after gel syneresis due to removal of solvents, drying and high temperature annealing. 1 One of the main advantages of sol-gel technology is the possibility of allowing most chemical elements to be introduced into the initial sol composition. Introduction of lanthanide salts into sols allows fabrication of efficient luminescent materials with high thermal stability and low temperature quenching. Particularly, PL of Eu, Er, and Tb from sol-gel-derived films has been reported over the last decade. 2-4 Further, it has been revealed that Er, Tb, and Eu-related PL from sol-gel films is strongly enhanced when the method is applied to mesoporous silicon 5,6 and mesoporous anodic alumina. 7-9 Among the mesoporous matrices utilized, including porous silicon, porous anodic alumina ͑PAA͒ and artificial opals, 10 PAA is the most promising template for fabrication of sol-gel derived films. This is due to its self-organized, reproducible morphology, low cost, and its ability to be patterned photolithographically using typical microelectronics processes. 11 The morphology of PAA comprises an array of hexagonal cells of anodic alumina, each containing a cylindrical pore. 12 Fabrication is through electrochemical anodizing of aluminum, generally in inorganic acid solutions. PAA is optically transparent in the visible to IR range, and it has high mechanical and thermal durability. By selecting the anodizing conditions, the appropriate geometr...

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STRONG 1. 53 μm LUMINESCENCE FROM ERBIUM-CONTAINING NANOCLUSTERS IN SOL-GEL DERIVED OXIDE FILMS

Cited by 2 publications

References 0 publications

Optical and Structural Characterization of Erbium-Doped TiO[sub 2] Xerogel Films Processed on Porous Anodic Alumina

Optical and Structural Characterization of Erbium-Doped TiO[sub 2] Xerogel Films Processed on Porous Anodic Alumina

Luminescence from Sol-Gel-Derived Europium-Doped Films Confined in Mesoporous Anodic Alumina

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