Biomedical Engineering Reference
In-Depth Information
Fig. 4.10
(
a
) Absorption and emission spectra (
λ
exc
=
465 nm) of 0.1
M QD-AM (
top
)and
0.55
MPP(
bottom
) in toluene at 295 K; (
b
) photoluminescence of “QD-PP” nanoassemblies at
x
1.
Broken lines
show a deconvolution of the spectra of QD and PP, respectively (
top
). QD-AM
photoluminescence quenching upon titration by PP at molar ratios
x
=
=
0.2, 0.5, 0.9, 2.5, and 5 (line
color from
orange
to
brown
). CdSe/ZnS QD-AM parameters:
d
CdSe
=
3.0 nm,
n
ZnS
=
2. Adapted
from [
74
]
Fig. 4.11
Relative
I
x
/
I
0
PL
quenching for QD-AM where
I
0
and
I
x
are PL intensities for
pure QDs and at given molar
ratio
x
, correspondingly. For
dashed lines
refer to
discussion. Adapted
from [
74
]
by intercalation of the aliphatic tale of DAP into the AM layer. A similar observation
has been discussed recently [
36
,
37
].
It is interestingly to note also that using PDI dyes with two different pyridyl-
type functional groups (namely DPP, and DTPP molecules shown in Fig.
4.3
),
it is possible to realize geometrically well-defined “QD-PDI” nanoassemblies,