TY - JOUR
T1 - Replication of wood into biomorphous nanocrystalline Y2O 3:Eu3+ phosphor materials
AU - Van Opdenbosch, Daniel
AU - Kostova, Mariya H.
AU - Gruber, Sabine
AU - Krolikowski, Sebastian
AU - Greil, Peter
AU - Zollfrank, Cordt
N1 - Funding Information:
Financial support by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) under grant No. Zo113/6-1 is gratefully acknowledged. The assistance of Edeltraud Völkel (Department for Materials Science and Engineering, Materials for Electronics and Energy Technology) with recording the cathodoluminescence images is gratefully appreciated.
PY - 2010/11
Y1 - 2010/11
N2 - Biomorphous Eu3+-doped Y2O3 was fabricated by replication of wood templates using vacuum-assisted infiltration of a water-based sol-gel mixture and subsequent calcination at 750°C. The precursor sols were prepared from (Y0.95Eu0.05) 2O3 dissolved in 10 vol% nitric acid and adding citric acid as the chelating agent. X-ray powder diffraction analyses and Rietveld refinements confirmed that the calcined samples were solely composed of bixbyite Y2O3:Eu3+ phase with a mean crystallite size of 16 nm. Scanning electron micrographs and cathodoluminescence imaging showed that the cellular preform anatomy was retained and that the original wood cell walls were completely transformed into phosphor struts with pore sizes ranging from 5 to 20 μm. The optical properties of the biomorphous phosphor materials were analyzed by photoluminescence spectroscopy and assigned to the characteristic Eu3+ (4f6 → 4f6) electric dipole or magnetic dipole transitions. From fluorescence lifetime measurements, the mean lifetime was calculated as 1.62 ms.
AB - Biomorphous Eu3+-doped Y2O3 was fabricated by replication of wood templates using vacuum-assisted infiltration of a water-based sol-gel mixture and subsequent calcination at 750°C. The precursor sols were prepared from (Y0.95Eu0.05) 2O3 dissolved in 10 vol% nitric acid and adding citric acid as the chelating agent. X-ray powder diffraction analyses and Rietveld refinements confirmed that the calcined samples were solely composed of bixbyite Y2O3:Eu3+ phase with a mean crystallite size of 16 nm. Scanning electron micrographs and cathodoluminescence imaging showed that the cellular preform anatomy was retained and that the original wood cell walls were completely transformed into phosphor struts with pore sizes ranging from 5 to 20 μm. The optical properties of the biomorphous phosphor materials were analyzed by photoluminescence spectroscopy and assigned to the characteristic Eu3+ (4f6 → 4f6) electric dipole or magnetic dipole transitions. From fluorescence lifetime measurements, the mean lifetime was calculated as 1.62 ms.
UR - http://www.scopus.com/inward/record.url?scp=78149467851&partnerID=8YFLogxK
U2 - 10.1007/s00226-010-0375-x
DO - 10.1007/s00226-010-0375-x
M3 - Article
AN - SCOPUS:78149467851
SN - 0043-7719
VL - 44
SP - 547
EP - 560
JO - Wood Science and Technology
JF - Wood Science and Technology
IS - 4
ER -