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  • 1.
    Amruth, C.
    et al.
    Lodz University of Technology, Poland.
    Luszczynska, Beata
    Lodz University of Technology, Poland.
    Szymanski, Marek Zdzislaw
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013). Örebro University, Sweden.
    Ulanski, Jacek
    Lodz University of Technology, Poland.
    Albrecht, Ken
    Tokyo Institute of Technology, Japan; Kyushu University, Japan.
    Yamamoto, Kimihisa
    Tokyo Institute of Technology, Japan.
    Inkjet printing of thermally activated delayed fluorescence (TADF) dendrimer for OLEDs applications2019Ingår i: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 74, s. 218-227Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study presents the inkjet printing of a novel OLED device with fully solution-processed organic layers that employ TADF material as an emitting layer. The ink was formulated using new TADF material, triazine core carbazole dendrimers with tert-butyl group at the periphery (tBuG2TAZ), dissolved in a mixture of two non-chlorinated solvents. The influence of the print resolution and the substrate temperature on morphology of the printed films was studied and optimized in ambient conditions. The optimized TADF dendrimer layer was then incorporated in the OLEDs as the emitting layer. The best-printed OLEDs exhibited a maximum current efficiency of 18 cd/A and maximum luminance of 6900 cd/m(2). Such values are comparable to the values obtained in spin coated devices made of the same TADF dendrimer. Further, the mobility of charge carriers extracted from transient electroluminescence measurements of printed OLEDs, when compared to reference OLEDs made by spin coating technique, showed similar values. Finally, we have demonstrated the possibility of patterning of emission the area of complex shapes merely by selectively printing the emission layer. These results demonstrate the potential application of the new dendrimer TADF emitters for the fabrication of efficient OLEDs by an inkjet printing technique.

  • 2.
    Amruth, C.
    et al.
    Lodz University of Technology, Poland.
    Szymanski, Marek Zdzislaw
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013). Örebro University.
    Luszczynska, Beata
    Lodz University of Technology, Poland.
    Ulanski, Jacek
    Lodz University of Technology, Poland.
    Inkjet printing of super yellow: Ink formulation, film optimization, OLEDs fabrication, and transient electroluminescence2019Ingår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, s. 1-10, artikel-id 8493Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Inkjet printing technique allows manufacturing low cost organic light emitting diodes (OLEDs) in ambient conditions. The above approach enables upscaling of the OLEDs fabrication process which, as a result, would become faster than conventionally used vacuum based processing techniques. In this work, we use the inkjet printing technique to investigate the formation of thin active layers of well-known light emitting polymer material: Super Yellow (poly(para-phenylene vinylene) copolymer). We develop the formulation of Super Yellow ink, containing non-chlorinated solvents and allowing stable jetting. Optimization of ink composition and printing resolution were performed, until good quality films suitable for OLEDs were obtained. Fabricated OLEDs have shown a remarkable characteristics of performance, similar to the OLEDs fabricated by means of spin coating technique. We checked that, the values of mobility of the charge carriers in the printed films, measured by transient electroluminescence, are similar to the values of mobility measured in spin coated films. Our contribution provides a complete framework for inkjet printing of high quality Super Yellow films for OLEDs. The description of this method can be used to obtain efficient printed OLEDs both in academic and in industrial settings.

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