The invention relates to novel conjugated polymers containing one or more diindeno-thieno[3,2-b]thiophene based polycyclic repeating units, to methods for their preparation and educts or intermediates used therein, to polymer blends, mixtures and formulations containing them, to the use of the polymers, polymer blends, mixtures and formulations as organic semiconductors in organic electronic (OE) devices, especially in organic photovoltaic (OPV) devices and organic photodetectors (OPD), and to OE, OPV and OPD devices comprising these polymers, polymer blends, mixtures or formulations.

The invention relates to new conjugated semiconducting polymers containing thermally cleavable side groups. The thermally cleavable side groups are selected from among carbonate groups and carbamate groups, By thermally cleaving side groups, the solubility or the polymers can he reduced in a targeted manner. The polymers are used as semiconductors in organic electronic (OE) devices, especially in organic photovoltaic (OPV) devices, organic photodetectors (OPDs), organic light emitling diodes (OLEDs), and organic field effect transistors (OFETs).

The invention relates to polymers having at least one asymmetrical structural unit of the following formula (I): wherein A, B, Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.4, n, m, o and p can have the meaning as defined in claim 1, to methods for the production thereof and to the use thereof in electronic or optoelectronic devices, in particular in organic electroluminescent devices, so-called OLEDs (OLED=Organic Light Emitting Diodes). The present invention also relates to organic electroluminescent devices which contain said polymers.

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The temperature tuned conjugated polymer laser uses a thiophene-based conjugated polymer as the laser medium to produce an output laser beam having a wavelength tunable between approximately 552 nm and approximately 612 nm over a temperature range of the thiophene-based conjugated polymer between approximately 60 C. and approximately 10 C., with an overall tunability of about 1.2 nm/ C. The thiophene-based conjugated polymer laser medium is a solution of poly[3-(2-ethyl-isocyanato-octadecanyl)-thiophene] dissolved in tetrahydrofuran (THF). A temperature controller selectively and controllably adjusts the temperature of the thiophene-based conjugated polymer to selectively and controllably tune the wavelength of the output laser beam.