【摘要】 研究了由噻吩乙烯发色团单元和惰性寡甲撑单元组成的交替嵌段聚合物与小分子量染料[2 methyl 6 [(2,3,6,7 tetrahydro 1H,5H benxo[ij]quinolixin q yl)ethenyl] 4H pylidene] 丙烷二腈(MPD)共混物薄膜的光致发光。这种共混物在645nm处产生增强的红光发射。发射增强的部分原因是来源于晶化共聚合物与染料之间有效的能量传递。更多还原

【Abstract】 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 quinolizin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.更多还原