Calcination‐ and Etching‐Free Photolithography of Inorganic Phosphor Films Consisting of Rare Earth Ion Doped Nanoparticles on Plastic Sheets

Abstract

It is demonstrated that patterned inorganic phosphor films consisting of rare earth ion doped nanoparticles (RE‐NPs) can be fabricated on plastic sheets using calcination‐ and etching‐free photolithography. Green up‐conversion luminescence and near‐infrared (NIR) fluorescence appears from the RE‐NPs that are prepared from Y2O3 doped with 1 mol% Er3+ and 0.85 mol% Yb3+. The diameter of the RE‐NPs is estimated to be about 300 nm using dynamic light scattering. Visible transmittance of the RE‐NP film fabricated by dip‐coating is more than 90%. Patterned RE‐NP films are obtained by dip‐coating the RE‐NPs on patterned photoresist films fabricated by UV exposure through a photomask, followed by selective removal of the photoresist. Optical, fluorescence, scanning electron, atomic force, and Kelvin probe force microscopies are used for the characterization of the patterned RE‐NP films. The present methodology enables fabrication of patterned RE‐NP films, not only on inorganic substrates but also on plastic sheets, with low cost and material consumption.

Two-wavelength infrared responsive hydrogel actuators containing rare-earth photothermal conversion particles

“…Nd 2 O 3 and Yb 2 O 3 particles with diameters of 100 nm were used as wavelength-selective photothermal conversion REO materials at 808 ( 4 F 9/2 – 2 H 9/2 and 4 F 9/2 – 4 F 5/2 transitions of Nd 3+ ) and 980 nm ( 2 F 7/2 – 2 F 5/2 transition of Yb 3+ ), respectively 42 , 43 . Rare-earth nanomaterials, including REOs, are frequently used as fluorescence, phosphorescence, and upconversion luminescence emission materials, and the emission efficiency is then crucial for the required performance 44 – 46 .…”

Micromolding in Capillaries for Calcination-Free Fabrication of Flexible Inorganic Phosphor Films Consisting of Rare-Earth-Ion-Doped Nanoparticles

“…We have reported calcination-free photolithography of RE nanoparticle films on solid substrates. , Because MIMIC has been applied to the patterning of micro- and nano-particle films of polymer beads, we have employed MIMIC to fabricate the RE nanoparticle films on glass plates.…”

Calcination-free micropatterning of rare-earth-ion-doped nanoparticle films on wettability-patterned surfaces of plastic sheets

“…Er 3+ -and Yb 3+ -doped Y 2 O 3 nanoparticles were synthesized according to the literature [8,25]. Y(NO 3 ) 3 Á6H 2 O, Er(NO 3 ) 3 Á5H 2 O, Yb(NO 3 )Á5H 2 O, and urea were purchased from Aldrich.…”