Biomedical Engineering Reference
In-Depth Information
b
a
0,8
250
524 nm
7
421nm
1
515 nm
0,7
200
0,6
2
increase
6
increase
3
0,5
150
decrease
0,4
x10
4
5
increase
512 nm
100
0,3
590 nm
0,2
4
50
648 nm
653 nm
5
0,1
3
6
7
2
1
0,0
0
300
400
500
600
700
800
500
550
600
650
700
750
800
Wavelength, nm
Wavelength, nm
Fig. 4.4
Absorption (
a
) and emission (
b
,
λ
ex
=
465 nm) spectra of CdSe/ZnS QD (CdSe core
diameter
d
CdSe
=
2.5 nm, number of ZnS monolayers
n
ZnS
=
2) and (
m
-Pyr)
3
-H
2
P porphyrin
molecules in toluene at 295 K upon increase of the molar ratio
x
[
C
Porph
]/[
C
QD
]: 0.0(1); 0.19 (2);
0.43 (3); 0.83 (4); 2.15 (5); 3.5 (6); 4.9 (7). The corresponding band maxima are shown according
to [
62
]
=
Fig. 4.5
Time-resolved emission traces (
a
,
b
) and fitted decay times and amplitudes (
c
,
d
)for
CdSe QD (
a
,
c
;
λ
em
=
580 nm) and (m-Pyr)
4
-H
2
P molecules (
b
,
d
;
λ
em
=
653 nm) at various molar
10
−
7
M,
d
CdSe
=
ratios
x
=
[
C
Porph
]/[
C
QD
] in toluene at 295 K at
λ
exc
=
532 nm.
C
QD
=
4
×
3.2 nm,
n
ZnS
=
0. IRF corresponds to the system response. (
b
)
x
=
0 corresponds to the spurious PL of the
QD at the (m-Pyr)
4
-H
2
P emission wavelength and
x
=
∞
to a sample with only (m-Pyr)
4
-H
2
P.
Figure adapted from [
123
]
