<s>
Polydioctylfluorene	B-Library
(	O
PFO	O
)	O
is	O
an	O
organic	O
compound	O
,	O
a	O
polymer	B-Language
of	O
9	O
,	O
9-dioctylfluorene	O
,	O
with	O
formula	O
(C13H6(C8H17 )	O
2	O
)	O
n	O
.	O
It	O
is	O
an	O
electroluminescent	O
conductive	B-Algorithm
polymer	I-Algorithm
that	O
characteristically	O
emits	O
blue	O
light	O
.	O
</s>
<s>
Like	O
other	O
polyfluorene	O
polymers	B-Language
,	O
it	O
has	O
been	O
studied	O
as	O
a	O
possible	O
material	O
for	O
light-emitting	O
diodes	O
.	O
</s>
<s>
Polydioctylfluorene	B-Library
(	O
PFO	O
)	O
can	O
be	O
found	O
in	O
liquid-crystalline	O
,	O
glassy	O
,	O
amorphous	O
,	O
semi-crystalline	O
or	O
β-chain	O
formation	O
.	O
</s>
<s>
The	O
solid	O
formations	O
though	O
,	O
typically	O
form	O
low	O
density	O
due	O
to	O
the	O
low	O
cooling	O
rate	O
of	O
the	O
polymer	B-Language
.	O
</s>
<s>
The	O
density	O
of	O
polydioctylfluorene	B-Library
is	O
measured	O
by	O
using	O
the	O
process	O
of	O
ultraviolet	O
photoelectron	O
spectroscopy	O
.	O
</s>
<s>
By	O
changing	O
the	O
strain	O
and	O
temperature	O
applied	O
to	O
the	O
polymer	B-Language
's	O
structure	O
results	O
in	O
an	O
alteration	O
of	O
the	O
PFO	O
's	O
properties	O
.	O
</s>
<s>
Polymer	B-Language
196	O
is	O
the	O
most	O
commonly	O
studied	O
type	O
of	O
polydioctylfluorene	B-Library
.	O
</s>
<s>
In	O
studies	O
,	O
polymer	B-Language
196	O
has	O
shown	O
the	O
most	O
promising	O
properties	O
and	O
the	O
best	O
crystallinity	O
.	O
</s>
<s>
Within	O
the	O
crystal	O
structure	O
of	O
polymer	B-Language
196	O
octyl	O
side	O
chains	O
are	O
inserted	O
between	O
the	O
layer	O
of	O
the	O
polymer	B-Language
to	O
provide	O
more	O
space	O
for	O
efficiency	O
in	O
structuring	O
the	O
material	O
.	O
</s>
<s>
In	O
studies	O
,	O
the	O
structure	O
of	O
polydioctylfluorene	B-Library
was	O
observed	O
by	O
using	O
grazing-incidence	O
X-ray	O
diffraction	O
after	O
applying	O
friction	O
to	O
the	O
structure	O
.	O
</s>
<s>
Polydioctylfluorene	B-Library
,	O
can	O
also	O
be	O
known	O
as	O
polymer	B-Language
196	O
to	O
polyfluorene	O
.	O
</s>
<s>
There	O
have	O
also	O
been	O
reports	O
that	O
some	O
of	O
the	O
solid	O
states	O
of	O
polydioctylfluorene	B-Library
are	O
composted	O
in	O
sheet-like	O
layers	O
which	O
are	O
about	O
50	O
–	O
100nm	O
thick	O
.	O
</s>
<s>
Polydioctylfluorene	B-Library
is	O
a	O
polymer	B-Language
light-emitting	O
device	O
known	O
as	O
PLED	O
,	O
which	O
covalently	O
bonds	O
to	O
the	O
carbon	O
hydrogen	O
chains	O
.	O
</s>
<s>
The	O
cross-linking	O
in	O
polydioctylfluorene	B-Library
structure	O
provides	O
an	O
efficient	O
technique	O
for	O
hole-transport	O
layers	O
to	O
emit	O
light	O
.	O
</s>
<s>
Also	O
,	O
when	O
a	O
solvent-polymer	O
compound	O
is	O
added	O
the	O
β-phase	O
crystalline	O
structure	O
to	O
be	O
maintained	O
.	O
</s>
<s>
The	O
hole-transport	O
layers	O
(	O
HTLs	O
)	O
improve	O
the	O
polymer	B-Language
's	O
anode	O
hole	O
injection	O
and	O
greatly	O
increase	O
electron	O
blocking	O
.	O
</s>
<s>
When	O
needs	O
for	O
optoelectronic	O
emittance	O
are	O
reached	O
in	O
polydioctylfluorene	B-Library
,	O
the	O
electroluminescence	O
given	O
off	O
in	O
dependent	O
on	O
the	O
active	O
layer	O
in	O
the	O
conjugate	O
polymer	B-Language
.	O
</s>
