Investigation of Polymeric Composite Films Using Modified TiO2 Nanoparticles for Organic Light Emitting Diodes
Nanocomposite films for hole transport and emitting layer were prepared
from poly(3,4-ethylenedioxythiophene),
poly(styrenesulfonate), and
poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] - as MEH-PPV
- incorporated with anatase
(TiO2) nanoparticles dispersed in oleic acid. The precursor for the sol
was a solution of tetraiso-propyl orthotitanate [Ti(iso-OC3H7)4].
The research showed that both the electrical and spectral properties of
the conjugated polymers were enhanced due to the incorporation of
anatase. The best volume ratio between the oleic acid precursor and
tetraiso-propyl orthotitanate was found to be of 10. Current-voltage
characteristics of organic light emitting diodes made from these
nanocomposite films were considerably enhanced in comparison with
those made from pure polymers. The luminous efficiency is reported.
Mechanical properties of the nanocomposite materials, (in particu-lar
for MEH-PPV-TiO2) were found to be dependent on constituent organic and
inorganic materials and on the geometric position of con-stituents. It
was concluded that such composite organic light emitting diodes can
exhibit larger performance efficiency and longer life-times than
classical light emitting diodes.
Nhận xét
Đăng nhận xét