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Kim, Hee Un,Kim, Ji-Hoon,Kang, Hyunbum,Grimsdale, Andrew C.,Kim, Bumjoon J.,Yoon, Sung Cheol,Hwang, Do-Hoon American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.23
<P>A series of aryl-substituted fullerene derivatives were prepared in which the aromatic moiety of [6,6]-phenyl C<SUB>61</SUB>-butyric acid methyl ester (PC<SUB>61</SUB>BM) was modified by replacing the monocyclic phenyl ring with bicyclic naphthalene (NC<SUB>61</SUB>BM), tricyclic anthracene (AC<SUB>61</SUB>BM), and tetracyclic pyrene (PyC<SUB>61</SUB>BM). The PC<SUB>61</SUB>BM derivatives were synthesized from C<SUB>60</SUB> using tosylhydrazone and were tested as electron acceptors in poly(3-hexylthiophene) (P3HT)-based organic photovoltaic cells (OPVs). The lowest unoccupied molecular orbital (LUMO) energy level of NC<SUB>61</SUB>BM (−3.68 eV) was found to be slightly higher than those of PC<SUB>61</SUB>BM (−3.70 eV), AC<SUB>61</SUB>BM (−3.75 eV), and PyC<SUB>61</SUB>BM (−3.72 eV). The electron mobility values obtained for the P3HT:PC<SUB>61</SUB>BM, P3HT:NC<SUB>61</SUB>BM, P3HT:AC<SUB>61</SUB>BM, and P3HT:PyC<SUB>61</SUB>BM blend films were 2.39 × 10<SUP>–4</SUP>, 2.27 × 10<SUP>–4</SUP>, 1.75 × 10<SUP>–4</SUP>, and 2.13 × 10<SUP>–4</SUP> cm<SUP>2</SUP> V<SUP>–1</SUP> s<SUP>–1</SUP>, respectively. P3HT-based bulk-heterojunction (BHJ) solar cells were fabricated using NC<SUB>61</SUB>BM, AC<SUB>61</SUB>BM, and PyC<SUB>61</SUB>BM as electron acceptors, and their performances were compared with that of the device fabricated using PC<SUB>61</SUB>BM. The highest power conversion efficiencies (PCEs) observed for devices fabricated with PC<SUB>61</SUB>BM, NC<SUB>61</SUB>BM, AC<SUB>61</SUB>BM, and PyC<SUB>61</SUB>BM were 3.80, 4.09, 1.14, and 1.95%, respectively, suggesting NC<SUB>61</SUB>BM as a promising electron acceptor for OPVs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-23/am504939c/production/images/medium/am-2014-04939c_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am504939c'>ACS Electronic Supporting Info</A></P>
Progress towards stable blue light-emitting polymers
Andrew C. Grimsdale,Jingying Zhang,Klaus M?len,Luke Oldridge,Martin Gaal,Emil J. W. List,Josemon Jacob 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
New routes have been developed for the synthesis of blue-emitting conjugated polymers designed to show stable blue-emission inLEDs. Fluorenes bearing polyphenylene dendrimer side-chains have been made by a new route in which the dendrimer substituentsare built up on a biphenyl which is then ring-closed to give the uorene. This route can be used to make uorenes with a range offunctionalised rst and second generation dendrimer substituents, as monomers for new blue-emitting polymers. Polyindenouo-renes bearing aryl substituents have been made and found to display much stabler blue-emission than previous polyindenouorenes.
Kim, Ji-Hoon,Park, Jong Baek,Jung, In Hwan,Grimsdale, Andrew C.,Yoon, Sung Cheol,Yang, Hoichang,Hwang, Do-Hoon The Royal Society of Chemistry 2015 ENERGY AND ENVIRONMENTAL SCIENCE Vol.8 No.8
<P>We have synthesized a series of conjugated D-pi-A copolymers, PT-ttTPD and PBT-ttTPD, based on a (5-hexyltridecyl)-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione (ttTPD) acceptor unit in order to develop better photovoltaic polymers based on the TPD moiety: an epsilon-branched alkyl side chain on the TPD unit was coupled with 6-alkyl-thieno[3,2-b]thiophene (tt) pi-bridge molecules. The Stille polymerization of the brominated ttTPD and stannylated simple thiophene (T) finally gave a promising PT-ttTPD polymer showing well-ordered inter-chain orientation in the BHJ active layer. PT-ttTPD-based OPVs exhibited a highest power conversion efficiency (PCE) of 9.21% (V-OC = 0.86 V, J(SC) = 15.30 mA cm(-2), FF = 70%).</P>
Kim, Hee Un,Kim, Ji-Hoon,Suh, Hongsuk,Kwak, Jeonghun,Kim, Dongwook,Grimsdale, Andrew C.,Yoon, Sung Cheol,Hwang, Do-Hoon The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.93
<P>We have found that 9,9′BF can be used as an electron acceptor for P3HT-based OPVs while similar devices using 4,4′BP do not show any photovoltaic effect. This can be related to the respective aromaticity and antiaromaticity of the reduced forms of 9,9′BF or 4,4′BP. The OPV device fabricated using P3HT and 9,9′BF exhibited a PCE of 2.28% with a <I>V</I><SUB>oc</SUB> of 1.07 V, a <I>J</I><SUB>sc</SUB> of 5.04 mA cm<SUP>−2</SUP>, and a FF of 0.42.</P> <P>Graphic Abstract</P><P>We have found that 9,9′BF can be used as an electron acceptor for P3HT-based OPVs while similar devices using 4,4′BP do not show any photovoltaic effect. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc46557h'> </P>
Synthesis of Host Polymers and Guests for Electrophosphorescence
Watkins Scott E.,Chan, Khai Leok,Cho, Sung-Yong,Evans Nicholas R.,Grimsdale Andrew C.,Holmes Andrew B.,Mak Chris S.K.,Sandee Albertus J.,Williams Charlotte K. The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.2
Significant progress has been realized in the design and synthesis of light emitting polymers that emit over the entire visible spectrum. However, up to seventy-five percent of charge recombination events can lead to triplet states that decay non-radiatively. Following the pioneering work in the field of small molecule organic light emitting devices, it has been found that solution processible iridium polymer complexes can be used to harness the wasted triplet energy. In this paper, new results with respect to the electrophosphorescence of solution processible tethered iridium polymer derivatives are presented. Furthermore, our approaches to the design of new high triplet energy conjugated polymer hosts are also reported.