CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

Figure 47 (a) shows room temperature emission spectrum of Sb 2 O 3 nanorods prepared
in presence of Eu 3+ ions obtained after excitation at 220 nm. A broad emission at ~ 390 nm
has been observed from the sample. Considering the band gap energy values of Sb 2 O 3 (~ 3.3
eV) and based on previous Sb 3+ luminescence studies the peak around 390 nm has been
attributed to the near band edge emission arising form Sb 2 O 3 . Since on excitation at 220 nm
no characteristic emission of Eu 3+ ions is observed from Sb 2 O 3 nanorods prepared in presence
of Eu 3+ ions suggests that Eu 3+ ions are not getting incorporated into the Sb 2 O 3 lattice and
also there is no energy transfer between the Sb 2 O 3 host and Eu 3+ ions. Figure 47 (b) shows
the emission spectrum of Sb 2 O 3 nanorods prepared in presence of Eu 3+ ions obtained after
excitation at 395 nm along with the excitation spectrum monitored at 615 nm emission (as an
inset).
Intensity (arb.units)
600 (a)
400
200
0
350 400 450 500 550 600 650
2500
4500
3000
1500
0
(b)
5
D 0
5 D 0
7
F 1
0
200 300 400
Wavelength (nm)
550 600 650 700 750
5
D 0
7 F 2
7
F 2
5 D 0
7 F 4
18000 (c)
12000
D 6000 0
F 1
5 D 0
7 F 4
0
550 600 650 700 750
Wavelength (nm)
Fig.47 Emission spectrum from Sb 2 O 3 nanorods prepared in presence of 5 at % Eu 3+ and
obtained after (a) 220 nm excitation and (b) 395 nm excitation. The corresponding
pattern from bulk Sb 2 O 3 prepared in presence of 5 atom % Eu 3+ obtained after 395 nm
excitation is shown in Fig.47 (c). The inset of Fig.47 (b) shows the excitation
spectrum monitored at 615 nm emission.
2000
1500
1000
500
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