Charge transporting block copolymer for morphological control in light emitting device based on polymer blends

Polyfluorene-Polytriarylamine Block Copolymer as an Additive for Electroluminescent Devices Based on Polymer Blends

“…In fact, the maximum current efficiency and luminescence at 30 mA/cm 2 increased with the increase of the content of PF-b-PTAA2. The similar effect of a block copolymer as an additive was observed for electro-phosphorescent devices based on the blend systems consisting of two types of vinyl homopolymers (hole and electron transporting), and bipolar block copolymer with both segments [16]. Figure 4 represents the AFM images of blend films with the thickness of ca.…”

“…We also investigated the correlation between device performance and morphology in polymer layer by evaluation of the devices based on the polymer blend (hole and electron transporting polymers), to which various contents of block copolymer are added to control phaseseparated structure, and found that the current efficiency significantly increased with the addition of the block copolymer accompanied with the decrease of surface roughness [16]. In this paper, EL devices were fabricated based on the blend systems consisting of PTAA, PF, and a block copolymer with both segments (PF-b-PTAA), and the relationship between chemical nature and morphology of the active layer, and EL performance was elucidated.…”

Metal Free Reversible-Deactivation Radical Polymerizations: Advances, Challenges, and Opportunities

“…Hawker elegantly showed with labelling experiments that the nitroxide moiety does not necessarily stay on one particular polymer chain end but migrates from one chain to another during the polymerization reaction [ 25 ]. During the last decades, development of new initiating systems [ 26 , 27 ], improvement of nitroxides [ 20 , 28 , 29 , 30 , 31 ], accelerating the polymerization rates by using additives [ 32 , 33 , 34 , 35 , 36 , 37 ] or additionally added initiators [ 38 , 39 , 40 ] and the possibility to synthesize complex polymer structures [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ] in combination with the easiness of the method, which does not need high purity chemicals or water free systems further subsidized the success of NMRP. While first experiments which were carried out with 2,2,6,6,-tetramethylpiperidin-1-oxyl (TEMPO) ( N2 in Chart 1 ) as the nitroxide and styrene (St) as the monomer were successful, it became soon evident that tuning the electronic structure and the steric demand of the nitroxide is a crucial point in further developing NMRP [ 28 , 58 , 59 , 60 , 61 , 62 ].…”

Fluorescent monomers as building blocks for dye labeled polymers: synthesis and application in energy conversion, biolabeling and sensors

“…246 Oxa14 to Oxa16 were copolymerized with polymerizable triphenylamines or carbazoles, respectively, using the NMP technique (also block copolymers were synthesized). 247,248 Oxa17 and Oxa18 were used for the construction of random copolymer architectures with carbazole or triphenylamine moieties by NMP 249,250 and Oxa19 to Oxa26 were polymerized by FRP and ROMP, respectively. 251 Others A wide range of other dyes which are capable to be polymerized are listed in this section (see Scheme 14 for exact structures).…”