Journal of Oleo Science
Online ISSN : 1347-3352
Print ISSN : 1345-8957
ISSN-L : 1345-8957
Detergents and Interface Science
Calcination-Free Liftoff Photolithography of Mixed Dip-Coated Films Consisting of Rare-Earth-Ion-Doped Nanoparticles on Plastic Sheets
Satoshi WatanabeHiroshi HyodoHirohisa TaguchiKohei SogaYoshifumi TakanashiMutsuyoshi Matsumoto
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2012 Volume 61 Issue 10 Pages 565-573


We discuss the calcination-free liftoff photolithography of inorganic phosphor films consisting of two kinds of rare-earth-ion-doped (RE) nanoparticles dip-coated onto plastic sheets. Green and red upconversion luminescence were emitted from the RE-nanoparticles prepared from Y2O3 nanoparticles doped with 1 mol% Er3+ and 0.75 mol% Yb3+ (RE-1-nanoparticles) and those doped with 3 mol% Er3+ and 7 mol% Yb3+ (RE-2-nanoparticles), respectively. Near-infrared (NIR) fluorescence was also observed in the RE-1- and RE-2-nanoparticles. The visible transmittance of the RE-nanoparticle films was more than 90%. The intensity ratio of the green to red upconversion luminescence was controlled by adjusting the mixing ratio of the RE-1- and RE-2-nanoparticles. These results indicate that the multicolor-emitting devices can be fabricated easily for applications of flexible inorganic phosphor films to displays, emitting devices, and sensors with long operating lifetimes and resistance to UV light, air, and water.

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© 2012 by Japan Oil Chemists' Society
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