CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

Intensity(arb.units)
1.0
0.8
0.6
0.4
0.2
as prepared
500°C
900°C
0.0
550 600 650 700 750
Wavelength (nm)
(a)
Intensity(arb.units)
1000
100
10
(b)
as prepared
500°C
900°C
0 2 4 6 8 10
Time (ms)
Fig.53. Emission spectra (a) and decay curves corresponding to the 5 D 0 level of Eu 3+ (b) for
the product obtained by the reaction between Sb 3+ and Eu 3+ ions taken in the
stoichiometric ratio. Samples were excited at 395 nm and emission was monitored at
612nm.
Hence based on the detailed luminescence and XRD studies, it is confirmed that Eu 3+
and Sb 3+ forms an amorphous antimony europium hydroxide. This amorphous compound
undergoes decomposition on heating around 900°C, leading to the formation of mainly Eu 2 O 3
and hydrated Sb(V) oxides.
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