The photocatalytic reaction of the thin film TiO2-Sr 4Al14O25 phosphors for benzene gas

Seung Woo Kim, Jung Sik Kim

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Phosphorescent materials coated with titanium dioxide were fabricated and photocatalytic reactions between these materials and VOCs gases were examined. A thin film (approx. 100 nm) of nanosized TiO2 was deposited on the Sr4Al14O25: Eu2+, Dy 3+,Ag+ phosphor using low-pressure chemical vapor deposition (LPCVD). The characteristics of the photocatalytic reaction were examined in terms of the decomposition of benzene gas using a gas chromatography (GC) system under ultraviolet (λ = 365 nm) and visible light (λ > 420 nm) irradiation. TiO2-coated Sr4Al 14O25: Eu2+, Dy3+,Ag+ phosphor showed different photocatalytic behavior compared with pure TiO 2. TiO2-coated phosphorescent materials showed a much faster photocatalytic decomposition of benzene gas under visible irradiation compared to the pure TiO2 for which the result was practically negligible. This suggests that the extension of the absorption wavelength to visible light occurred through energy band bending by a heterojunction at the interface of the Sr4Al14O25-TiO2 composite. Also, the Sr4Al14O25-TiO2 composite showed the photocatalytic decomposition of benzene in darkness due to the photon light emitted from the Sr4Al14O25 phosphors.

Original languageEnglish
Pages (from-to)50-56
Number of pages7
JournalJournal of the Korean Ceramic Society
Issue number1
StatePublished - 1 Jan 2013


  • Chemical vapor deposition (CVD)
  • Photocatalyst
  • Sr AlO-TiO composite
  • TiO
  • VOCs


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