TY - JOUR
T1 - Fabrication of monodispersed, multilayered silica-Y:Eu-silica core-shell particles and their photonic crystals
AU - Kobayashi, Yoshio
AU - Imai, Jun Ichi
AU - Nagao, Daisuke
AU - Konno, Mikio
PY - 2009
Y1 - 2009
N2 - Methods for preparing monodispersed, multilayered silica-Y:Eu-silica core-shell particles and for fabricating their colloidal photonic crystals are proposed. Silica-Y:Eu core-shell particles with a size of 360 nm were synthesized with a homogeneous precipitation method at 80°C in a 50/50 (v/v) water/propanol solution at 0.0009 mol/dm3 Y(NO3)3, 0.0001 mol/dm3 Eu(NO3)3 0.5 mol/dm3 urea, I g/dm3 polyvinylpyrrolidone (PVP) and 0.01 vol% suspension of silica particles with an average size of 330 nm. Succeeding silica-coating of the silica-Y:Eu core-shell particles was performed in ethanol at 10 mmol/dm3 tetraethylorthosilicate, 11 mol/dm3 H2O, 0.5 mol/dm3 ammonia, 5 mmol/dm3 acetic acid, 1 g/dm3 PVP and 0.001 vol% suspension of silica:Eu core-shell particles. Consequently, multilayered silica-Y:Eu-silica core-shell particles with an average size of 460 nm and a coefficient of variation as low as 3.0% could be obtained. Colloidal crystals composed of these particles exhibited both reflection based on Bragg diffraction and luminescence of Y:Eu.
AB - Methods for preparing monodispersed, multilayered silica-Y:Eu-silica core-shell particles and for fabricating their colloidal photonic crystals are proposed. Silica-Y:Eu core-shell particles with a size of 360 nm were synthesized with a homogeneous precipitation method at 80°C in a 50/50 (v/v) water/propanol solution at 0.0009 mol/dm3 Y(NO3)3, 0.0001 mol/dm3 Eu(NO3)3 0.5 mol/dm3 urea, I g/dm3 polyvinylpyrrolidone (PVP) and 0.01 vol% suspension of silica particles with an average size of 330 nm. Succeeding silica-coating of the silica-Y:Eu core-shell particles was performed in ethanol at 10 mmol/dm3 tetraethylorthosilicate, 11 mol/dm3 H2O, 0.5 mol/dm3 ammonia, 5 mmol/dm3 acetic acid, 1 g/dm3 PVP and 0.001 vol% suspension of silica:Eu core-shell particles. Consequently, multilayered silica-Y:Eu-silica core-shell particles with an average size of 460 nm and a coefficient of variation as low as 3.0% could be obtained. Colloidal crystals composed of these particles exhibited both reflection based on Bragg diffraction and luminescence of Y:Eu.
KW - Colloidal photonic crystals
KW - Core-shell
KW - Luminescence
KW - Multilayer
KW - Particles
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U2 - 10.1252/jcej.08we209
DO - 10.1252/jcej.08we209
M3 - Article
AN - SCOPUS:63049109509
SN - 0021-9592
VL - 42
SP - 47
EP - 50
JO - Journal of Chemical Engineering of Japan
JF - Journal of Chemical Engineering of Japan
IS - 1
ER -