Biomedical Engineering Reference
In-Depth Information
3.14
Influence of particle size on the emission spectra of ZnO. (a) Blue
shift of the ZnO emission line with decreasing particle size. The
experimental points were fitted with equation 3.3. (b) Intensity ratio of
the quantum confinement peak over the oxide-polymer interaction
peak. The experimental points follow equation 3.5.
32
The wavelength of the emission maximum as a function of particle size
follows the relationship (Fig. 3.14(a)):
32
1
l
¼
1
l
0
þ
bd
3
½
3
:
3
1
l
¼
bd
3
D
½
3
:
4
From an experimental fit the values used are
λ
0
=542.7±0.4 nm and
10
3
±1
10
4
nm
2
; d is the particle diameter in nanometers.
b=5.61
6
6
The exponent
3 is the same as that found for the blue shift in ZnO related
to quantum confinement.
