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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.116  No.1360 (December) (2008)  >  pp.1265-1269

Journal of the Ceramic Society of Japan
<<Previous article Vol.116  No.1360 (December) (2008)   pp.1265 - 1269 Next article>>

Preparation of undoped and Tb3+-doped fluorescent HfO2 spherical particles

Tomoe SANADA1), Masashi KAWAI1), Hiroshi NAKASHITA1), Taichi MATSUMOTO1), Noriyuki WADA2) and Kazuo KOJIMA1)
1) Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University
2) Department of Materials Science and Engineering, Suzuka National College of Technology


  Undoped and Tb3+-doped HfO2 spherical particles were prepared by a sol-gel method, by using hafnium tetra-t-butoxide (Hf(O-t-C4H9)4) as a precursor of hafnium dioxide, SPAN85® as a surfactant, mixed solvent of C2H5OH and n-C4H9OH, and H2O, followed by investigation of their structural and optical properties. Spherical particles with good morphology and comparatively high dispersibility were obtained from solutions with the molar ratio SPAN85®:H2O = 1:8-17.5, their sizes being 0.2-5 μm in diameter. Particles became small and aggregated when the molar ratio of H2O was more than 17.5, but became large when it was less than 8. Spherical particles heat treated at 400°C or below were amorphous, and those heat treated at 600°C or above were crystallized. Tb3+-doped HfO2 spherical particles showed green luminescence due to the 5D47FJ (J = 6, 5, 4, 3) transitions of the Tb3+ ion, and relatively strong luminescence was observed both in dried gel particles and particles heat treated at 1000°C. These Tb3+-doped HfO2 spherical particles can be expected for new optical materials.


Keyword:
Spherical particle, Hafnium dioxide, Sol-gel method, Terbium, Luminescence

Received: June 11, 2008
Accepted: October 16, 2008 , Published online: December 01, 2008
Copyright (c) 2008 The Ceramic Society of Japan

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