Current time in Korea 18:00 Mar 29 (Fri) Year 2024 KCS KCS Publications
KCS Publications
My Journal  Log In  Register
HOME > Search > Browsing(BKCS) > Archives

Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 4
BKCSDE 32(4)
April 20, 2011 

 
Title
Tb3+ and Ce3+ Intercalated Laponite Powder: The Influence of Ce3+ Ions on Thermal Stability and Optical Properties of Tb3+ Intercalated Laponite
Author
Han Na Lee, Youhyuk Kim *
Keywords
Amorphous materials, Thermal properties, X-ray powder diffraction, Luminescence, Laponite
Abstract
Laponite samples intercalated with Tb3+ or Tb3+,Ce3+ ions were prepared by exchange of Na+ ions in interlayers with Tb3+ or Ce3+ ions. Strong green and weak blue emissions under vacuum ultraviolet (VUV) excitation (λ = 158 nm) were observed due to the 5D4→7FJ and 5D3→7FJ emission lines, respectively. Tb3+ ions in an interlayer of laponite mainly existed in ion pairs or clusters, as evidenced by the concentration-dependent luminescence of the Tb3+ ions on the relative intensities of the 5D3→7FJ and the 5D4→7FJ emission lines, due to the action of a cross-relaxation process. The addition of Ce3+ ions increased the thermal stability of Tb3+ intercalated laponite up to 650 oC and quenched the 5D3→7FJ emission lines, probably by promoting the formation of Tb3+ ion pairs at relatively low Tb3+ concentrations.
Page
1273 - 1276
Full Text
PDF