Photodegradation characteristics of sol–gel-derived glass-coated Eu-complex fabricated by solvothermal process using several silane alkoxides and solvents

Fukuda, Tsuguo; Kato, S.; Akiyama, Shinnosuke; Honda, Zentaro; Kamata, Norihiko

doi:10.1016/j.optmat.2012.06.001

Cited by 5 publications

(1 citation statement)

References 38 publications

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“…16 17 Recently, an encapsulating method has been widely investigated for improving long-term stability of Eu-complexes, and the superior long-term stability can be realized embedded in the sol-gel silica glass network even though the UV light is continuously irradiated. [18][19][20][21][22] This is because that the silica glass layer prevents the change in chemical structure of Eu-complex. Furthermore, the thermal stability of Eu-complex is also improved by encapsulating the sol-gel derived silica glass network.…”

Section: Introductionmentioning

confidence: 99%

Optical Degradation of Colloidal Eu-Complex Embedded in Silica Glass Film Using Reprecipitation and Sol–Gel Methods

Fukuda

Kurabayashi

Yamaki

2016

j nanosci nanotechnol

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A reprecipitation method has been investigated for fabricating colloidal nanoparticles using Eu-complex. Herein, we investigated optical degradation characteristics of (1,10-phenanthroline)tris [4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedionato]europium(III) colloidal nanoparticles, which were embedded into a silica glass film fabricated by a conventional sol-gel process. At first, we tried several types of good solvents for the reprecipitation method, and dimethyl sulfoxide (DMSO) is found to be a suitable solvent for realizing the small diameter and the high long-term stability against the ultraviolet irradiation even though the boing point of DMSO is higher than that of water used as a poor solvent. By optimizing the good solvent and the concentration of Eu-complex, the relative photoluminescence intensity of 0.96 was achieved even though the ultraviolet light was continuously irradiated for 90 min. In addition, the average diameter of 106 nm was achieved when DMSO was used as a good solvent, resulting in the high transmittance at a visible wavelength region. Therefore, we can achieve the transparent emissive thin film with a center wavelength of 612 nm, and the optical degradation was drastically reduced by forming nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Optical Degradation of Colloidal Eu-Complex Embedded in Silica Glass Film Using Reprecipitation and Sol–Gel Methods

Fukuda

Kurabayashi

Yamaki

2016

j nanosci nanotechnol

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The effects of Eu-concentrations on the luminescent properties of SrF 2 :Eu nanophosphor

Yagoub

Swart

Noto

et al. 2014

Journal of Luminescence

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Visible-emitting hybrid sol–gel materials comprising lanthanide ions: thin film behaviour and potential use as phosphors for solid-state lighting

et al. 2014

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International audienceThe synthesis and characterization, as well as the film-forming and luminescent properties of four visible-emitting hybrid organic-inorganic sol-gel materials are reported. They show thermal stability up to 165°C. Deposition conditions were optimized to coat these materials as homogeneous and transparent thin films (~50 nm) with smooth surface, as probed by AFM. They were specifically designed to emit the primary colors. The blue-emitting material 1 was made up of a polyfluorene derivative embedded in a silica matrix, while the green (2) and red (3)-emissive materials comprise the TbIII and EuIII ions bound to the matrix, respectively. The films showed relatively high emission quantum yields efficiencies, with values of 19% (blue), 46% (green), and 21% (red). The three emitters were used to design a single emissive material (4) that showed emission colors from yellow-green to blue in a wide range of excitation wavelengths (254-380 nm). In particular, white light was obtained after excitation at 340 nm

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Photodegradation characteristics of sol–gel-derived glass-coated Eu-complex fabricated by solvothermal process using several silane alkoxides and solvents

Cited by 5 publications

References 38 publications

Optical Degradation of Colloidal Eu-Complex Embedded in Silica Glass Film Using Reprecipitation and Sol–Gel Methods

Optical Degradation of Colloidal Eu-Complex Embedded in Silica Glass Film Using Reprecipitation and Sol–Gel Methods

The effects of Eu-concentrations on the luminescent properties of SrF 2 :Eu nanophosphor

Visible-emitting hybrid sol–gel materials comprising lanthanide ions: thin film behaviour and potential use as phosphors for solid-state lighting

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