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  • 1.
    Amruth, C.
    et al.
    Lodz Univ Technol, Dept Mol Phys, PL-90924 Lodz, Poland..
    Luszczynska, Beata
    Lodz Univ Technol, Dept Mol Phys, PL-90924 Lodz, Poland..
    Szymanski, Marek Zdzislaw
    Karlstad Univ, Dept Engn & Chem Sci, SE-65188 Karlstad, Sweden.;Orebro Univ, Sch Sci & Technol, SE-70182 Orebro, Sweden..
    Ulanski, Jacek
    Lodz Univ Technol, Dept Mol Phys, PL-90924 Lodz, Poland..
    Albrecht, Ken
    Tokyo Inst Technol, Lab Chem & Life Sci, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan.;Tokyo Inst Technol, JST ERATO Yamamoto Atom Hybrid Project, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan.;Kyushu Univ, Inst Mat Chem & Engn, 6-1 Kasuga Koen, Kasuga, Fukuoka 8168580, Japan..
    Yamamoto, Kimihisa
    Tokyo Inst Technol, Lab Chem & Life Sci, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan.;Tokyo Inst Technol, JST ERATO Yamamoto Atom Hybrid Project, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan..
    Inkjet printing of thermally activated delayed fluorescence (TADF) dendrimer for OLEDs applications2019In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 74, p. 218-227Article in journal (Refereed)
    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. Chavhan, Sudam D.
    et al.
    Hansson, Rickard
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Ericsson, Leif
    Karlstad University, Faculty of Technology and Science, Materials Science. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Beyer, Paul
    Hofmann, Alexander
    Brütting, Wolfgang
    Opitz, Andreas
    Moons, Ellen
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Low temperature processed NiOx hole transport layers for efficient polymer solar cells2017In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 44, p. 59-66Article in journal (Refereed)
  • 3.
    Farinhas, Joana
    et al.
    Inst Super Tecn, Inst Telecomunicacoes, Av Rovisco Pais, P-1049001 Lisbon, Portugal..
    Oliveira, Ricardo
    Inst Super Tecn, Inst Telecomunicacoes, Av Rovisco Pais, P-1049001 Lisbon, Portugal..
    Hansson, Rickard
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Ericsson, Leif
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Moons, Ellen
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Morgado, Jorge
    Inst Super Tecn, Inst Telecomunicacoes, Av Rovisco Pais, P-1049001 Lisbon, Portugal.;Univ Lisbon, Inst Super Tecn, Dept Bioengn, Av Rovisco Pais, P-1049001 Lisbon, Portugal..
    Charas, Ana
    Inst Super Tecn, Inst Telecomunicacoes, Av Rovisco Pais, P-1049001 Lisbon, Portugal..
    Efficient ternary organic solar cells based on immiscible blends2017In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 41, p. 130-136Article in journal (Refereed)
    Abstract [en]

    Organic photovoltaic cells based on ternary blends of materials with complementary properties represent an approach to improve the photon-absorption and/or charge transport within the devices. However, the more complex nature of the ternary system, i.e. in diversity of materials' properties and morphological features, complicates the understanding of the processes behind such optimizations. Here, organic photovoltaic cells with wider absorption spectrum composed of two electron-donor polymers, F8T2, poly(9,9-dioctylfluorene-alt-bithiophene), and PTB7, poly([4,8-bis[(2'-ethylhexyl) oxy] benzo[1,2-b: 4,5-b'] dithiophene-2,6-diyl][3-fluoro-2-[(2'-ethylhexyl) carbonyl] thieno[3,4-b] thiophenediyl]), mixed with [6,6]-phenyl-C-61-butyric acid methyl ester (PC61BM) are investigated. We demonstrate an improvement of 25% in power conversion efficiency in comparison with the most efficient binary blend control devices. The active layers of these ternary cells exhibit gross phase separation, as determined by Atomic Force Microscopy (AFM) and Synchrotron-based Scanning Transmission X-ray Microscopy (STXM).

  • 4.
    Pavlopoulou, E.
    et al.
    University Bordeaux, France.
    Fleury, G.
    University Bordeaux, France.
    Deribew, Dargie
    University Bordeaux, France.
    Cousin, F.
    CEA Saclay, France.
    Geoghegan, M.
    University Sheffield, England.
    Hadziioannou, G.
    University Bordeaux, France.
    Phase separation-driven stratification in conventional and inverted P3HT:PCBM organic solar cells2013In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 14, no 5, p. 1249-1254Article in journal (Refereed)
    Abstract [en]

    We have used neutron reflectivity to investigate the stratification of poly(3-hexylthiophene) (P3HT) and phenyl-C-61-butyric acid methyl ester (PCBM) blend films. Films were spun-cast on poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) and titanium oxide (TiOx) layers to mimic the procedures followed for the fabrication of conventional and inverted organic photovoltaics respectively. The resultant scattering length density profiles reveal a PCBM-rich layer is formed in the vicinity of PEDOT: PSS or TiOx, while PCBM is depleted at the free surface of the film. PCBM segregation close to the substrate is further enhanced by annealing. This stratification is considered to be favorable only for inverted devices. (C) 2013 Elsevier B. V. All rights reserved.

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