Luminescence in low molecular weight chromophores is usually investigated in devices in which the small molecules are deposited onto a suitable electrode

or other substrate

from the gas phase. Gaining in high-quality thin films by using this technique is often difficult: an alternative is to employ a common polymer fabrication technique in which a film is obtained by spin casting from solution. This methodology

however

requires a matrix polymer whose function

in principle

can be either that of a purely inert carrier or that of an electro-optically active material involved in the carrier transport and emission from the device. In the present investigation

we extended this concept by employing a specifically designed alternating block copolymer which in the pure state emitted in the yellow-orange part of the spectrum but

in combination with the dispersed small molecular weight dye [2-methyl-6-[2-(2

3

6

7-tetrahydro-1

H

5

H

-benzo[

i

j

]quinolizin-q-yl)ethenyl]

-4

H

-pyran-4-ylidene]-propane dinitrile (MPD). The overlap of the emission and absorption spectra of the copolymer and of the dye blend to facilitate F rster energy transfer were necessary elements of this design. In our results

it is seen that the photoluminescent spectra from MPD in the PMMA matrix nearly coincide with the corresponding photoluminescent spectra with matrix at 595 and 660nm

respectively. Energy transfer in new blend from new polymer to the dye was suggested by spectral measurements of the single-layer film in which MPD was dispersed in new polymer with ω(MPD)=10% concentration

a value which optimized exciting confinement and minimized concentration quenching at 645nm. MPD dispersed in an alternating block copolymer containing thiophene vinylene chromophore units and inert oligomethylene spacer units provided bright red luminescent emission centered at 645nm. The strength of the emission was based

in part

on efficient energy transfer between the copolymer and the dye.