Exploitable results
The project aimed at performing foundational research in the field of organic optoelectronics and in particular aimed at exploring novel approaches based on field-effect technology to achieve an electrically pumped organic laser. The project strategy envisioned the use of an innovative approach based on the engineering of organic heterojunctions in field-effect devices by integration of all the needed scientific and technological competences. All activities were synergistically integrated in the project: photonic and optoelectronic device modelling, photonic nanofabrication technologies, ultrabroad- band characterisation of photonic nanostructures, field-effect device technology, OLED technology, organic materials and heterojunctions engineering, advanced growth methods for highly ordered organic heterojunctions, laser scanning confocal microscopy and spectroscopy for heterojunctions imaging and characterisation, ultrafast spectroscopy, optoelectronic device characterization and testing.
The consortium was formed by five partners from four European nations, including one SME, one prominent industrial enterprise, a national research lab, an independent research organisation and an academic research institution. These groups, international leaders in their respective field, complemented their expertise and facilities to reach the ambitious objectives of the project.
The consortium developed specific and unique know-how on photonic field-effect organic heterojunctions that represents a key competitive advantage over international competitors in USA and Japan in the field. It is worth highlighting that the results of the OLAS consortium partners are an international benchmark for the photonic field-effect organic heterojunction approach.
In order to strengthen the European leadership, the OLAS consortium took the initiative to organise topical discussions with other European groups and consortia in order to spread within the European scientific community its results and to promote the exchange of ideas on the most critical technological and scientific issues.The major results achieved during the project included:
??The modelling of the photonic and optoelectronic characteristics of the newly proposed device structure that were then used in the course of the project as a guide for the fabrication of the integrated photonic heterojunction device.
??The design and fabrication of an innovative planar photonic feedback structure that enables ultrasmall footprint surface emitting lasers. This allows in principle high integration density in the final device without increase of the optical losses at the edges of the structure.
??The development of a complete technology set for the fabrication of photonic field-effect organic heterojunction devices, both planar and hybrid.
??state-of-the-art ambipolar and balanced mobility in light-emitting field-effect transistors, which employ a double layer organic heterojunction.
??The realization of light-emitting field-effect transistors with state of the art n-type and p type?current densities (up to 1KA/cm2). The active layer of the device is based on a three layer?vertical heterojunction.
??The fabrication for the first time of an integrated photonic field-effect device.
??The determination of the ASE properties of the three layer vertical heterojunction device under optical pumping.
??The determination of the lasing properties of field-effect organic heterojunctions on photonic feedback structure under optical pumping.
??The evaluation of the charge-induced losses in the tri-layer vertical heterojunction device under electrical bias condition.
??The design and realization of a novel hybrid approach with organics and silicon-on-insulator technology for photonic feedback structures.
??The filing of three patents to ensure future possible exploitation of the project results.
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