Poly(

p

-phenylene vinylene)(PPV) and its derivatives have been investigated in electronics and photonics because of their excellent electronic and optical properties.It has been demonstrated that nanostructured PPVs are endowed with specialties for applications in new fields

such as wave-guiding and all-optical switching.(Using) porous anodic alumina with an ordered nanopore array as a template

the luminescent polymer MEH-PPV has been embedded into the nanopores as the template was immersed in MEH-PPV solution for 48 hours

then the template was taken out and washed with THF to drive out MEH-PPV chains on the surface of the(anodic) alumina template and then nano-MEH-PPV array was formed after the solvent volatilizes.It was demonstrated by analyzing of photoluminescence(PL) spectra that the optical properties of the nano-MEH-PPV array are obviously different from that of MEH-PPV film.It is also represented experimentally that the conformation of MEH-PPV in the nanopores of the anodic alumina is chain bunch.The number of MEH-PPV chains in the bunch depends on the concentration of the polymer solution for preparing the nano-MEH-PPV array.As the anodic alumina template is immersed in MEH-PPV solution with higher concentration

more MEH-PPV chains move into the nanopores to form the bunch.Due to interchain interaction

the energy bands of the MEH-PPV bunch are widened to decrease its energy gap

and then the PL peak of the nano-MEH-PPV is red-shifted.The more the polymer chains of the bunch

the wider the energy bands of the bunch and the larger the red-shift of the PLpeak of the polymer in the nanopores.So the optical properties of the nano-MEH-PPV array can be controlled by adjusting the concentration of the polymer solution for preparing the nano-MEH-PPV array.It is demonstrated by the PLspectra of the nano-MEH-PPV array annealed at different temperatures that the(relaxation) of MEH-PPV in the nanopores is limited and the nano-MEH-PPV shows highly thermal stabilities.