Yh. Kim et al., Ultrafast energy-transfer dynamics between block copolymer and pi-conjugated polymer chains in blended polymeric systems, CHEM MATER, 13(8), 2001, pp. 2666-2674
The blending of polymers has been conventionally employed to increase the q
uantum efficiencies of polymeric electroluminescence (EL) devices via the e
nergy transfer process, which was interpreted in terms of the Forster-type
energy transfer based on dipole-dipole interactions. The detailed analysis
of various time-resolved spectroscopic data in the blended polymer between
MEH-PPV (poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]) and DS
iPV (poly[1,3-propanedioxy-1,4-phenylene-1,2-ethylene(2,5-bis(trimethylsily
l)-1,4-phenylene)1,2-ethylene-1,4-phenylene]) provides some evidence that t
he ultrafast energy-transfer channel via the shortest interchain distance b
etween the adjacent constituent polymer chains should be considered to acco
unt for the dynamics of stimulated emission (SE) and photoinduced absorptio
n (PA) in the blended polymeric systems. These interchain interactions are
also responsible for the diminishment of SE of the blended polymer in the t
ransient absorption spectra, because PA is enhanced due to the formation of
interchain excitons. These results provide new insight into the role of in
terchain interactions in the improvement of heteropolymeric EL devices.