Electrophoretic deposition and characterization of transparent nanocomposite films of YVO4:Bi3+,Eu3+ nanophosphor and silicone-modified acrylic resin

Yoshiki Iso, Satoru Takeshita, Tetsuhiko Isobe

研究成果: Article査読

21 被引用数 (Scopus)

抄録

We fabricated nanocomposite films from an aqueous suspension of red-emitting YVO4:Bi3+,Eu3+ nanoparticles (hydrodynamic size: 22 ± 6 nm) and silicone-modified acrylic resin nanoparticles of (60 ± 15 nm) by electrophoretic deposition under application of a constant voltage. The nanocomposite films were formed from these negatively charged nanoparticles on ITO-coated glass substrates on the anodic side at the volume ratio of nanophosphor:resin ∼ 40:60. According to transmission electron microscopy observations, the YVO4:Bi 3+,Eu3+ nanoparticles are well-dispersed around the resin nanoparticles. The fabricated films are transparent to the naked eye under white light because both nanoparticles show no absorption and low light scattering in the visible region. A silicone-modified acrylic resin film without the nanophosphor exhibits no absorption in the UV region (>300.0 nm). However, the fabricated nanocomposite films show near-UV absorption owing to the interband transition between the valence band and the conduction band of the YVO4:Bi3+,Eu3+ nanoparticles. A sharp emission peak corresponding to the 5D07F 2 transition of Eu3+ is observed at 619.5 nm, under 365.0 nm excitation, for each nanocomposite film. The photoluminescence intensity at 619.5 nm under 365.0 nm excitation is proportional to 1-10-OD (OD: optical density at 365.0 nm) for film thicknesses ≤6 μm. This is attributed to the low light scattering from both nanoparticles in the nanocomposite film. Conversely, the observed photoluminescence intensity for film thicknesses >6 μm is higher than the value expected from the proportional relationship. This suggests that the excitation of the nanophosphors efficiently occurs due to multiple scattering of excitation light.

本文言語English
ページ(範囲)1465-1471
ページ数7
ジャーナルLangmuir
30
5
DOI
出版ステータスPublished - 2014 2 11

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

フィンガープリント 「Electrophoretic deposition and characterization of transparent nanocomposite films of YVO<sub>4</sub>:Bi<sup>3+</sup>,Eu<sup>3+</sup> nanophosphor and silicone-modified acrylic resin」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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