1 Ocak 2019 Dergi makalesi Açık Erişim

Usta, Hakan; Alimli, Dilek; Ozdemir, Resul; Dabak, Salih; Zorlu, Yunus; Alkan, Fahri; Tekin, Emine; Can, Ayse

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/90747</identifier>
  <creators>
    <creator>
      <creatorName>Usta, Hakan</creatorName>
      <givenName>Hakan</givenName>
      <familyName>Usta</familyName>
      <affiliation>Abdullah Gul Univ, Dept Mat Sci &amp; Nanotechnol Engn, TR-38080 Kayseri, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Alimli, Dilek</creatorName>
      <givenName>Dilek</givenName>
      <familyName>Alimli</familyName>
      <affiliation>Gebze Tech Univ, Dept Chem, TR-41400 Kocaeli, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Ozdemir, Resul</creatorName>
      <givenName>Resul</givenName>
      <familyName>Ozdemir</familyName>
      <affiliation>Abdullah Gul Univ, Dept Mat Sci &amp; Nanotechnol Engn, TR-38080 Kayseri, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Dabak, Salih</creatorName>
      <givenName>Salih</givenName>
      <familyName>Dabak</familyName>
      <affiliation>Sci &amp; Technol Res Council Turkey TUBITAK, Marmara Res Ctr MAM, TR-41470 Kocaeli, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Zorlu, Yunus</creatorName>
      <givenName>Yunus</givenName>
      <familyName>Zorlu</familyName>
      <affiliation>Gebze Tech Univ, Dept Chem, TR-41400 Kocaeli, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Alkan, Fahri</creatorName>
      <givenName>Fahri</givenName>
      <familyName>Alkan</familyName>
      <affiliation>Abdullah Gul Univ, Dept Mat Sci &amp; Nanotechnol Engn, TR-38080 Kayseri, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Tekin, Emine</creatorName>
      <givenName>Emine</givenName>
      <familyName>Tekin</familyName>
      <affiliation>Sci &amp; Technol Res Council Turkey TUBITAK, Marmara Res Ctr MAM, TR-41470 Kocaeli, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Can, Ayse</creatorName>
      <givenName>Ayse</givenName>
      <familyName>Can</familyName>
      <affiliation>Abdullah Gul Univ, Dept Mat Sci &amp; Nanotechnol Engn, TR-38080 Kayseri, Turkey</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Highly Efficient Deep-Blue Electroluminescence Based On A Solution-Processable A-Pi-D-Pi-A Oligo(P-Phenyleneethynylene) Small Molecule</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2019</publicationYear>
  <dates>
    <date dateType="Issued">2019-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/90747</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1021/acsami.9b12971</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">The development of solution-processable fluorescent small molecules with highly efficient deep-blue electroluminescence is of growing interest for organic light-emitting diode (OLED) applications. However, high-performance deep-blue fluorescent emitters with external quantum efficiencies (EQEs) over 5% are still scarce in OLEDs. Herein, a novel highly soluble oligo(p-phenyleneethynylene)-based small molecule, 1,4-bis((2-cyanophenyl)ethynyl)-2,5-bis(2-ethylhexyloxy)benzene (2EHO-CNPE), is designed, synthesized, and fully characterized as a wide band gap (2.98 eV) and highly fluorescent (Phi(PL) = 0.90 (solution) and 0.51 (solid-state)) deep-blue emitter. The new molecule is functionalized with cyano (-CN)/2-ethylhexyloxy (-OCH2CH(C2H5)C4H9) electron-withdrawing/-donating substituents, and ethynylene is used as a pi-spacer to form an acceptor (A)-pi-donor (D)-pi-acceptor (A) molecular architecture with hybridized local and charge transfer (HLCT) excited states. Physicochemical and optoelectronic characterizations of the new emitter were performed in detail, and the single-crystal structure was determined. The new molecule adopts a nearly coplanar pi-conjugated framework packed via intermolecular "C-H center dot center dot center dot pi" and "C-H center dot center dot center dot N" hydrogen bonding interactions without any pi-pi stacking. The OLED device based on 2EHO-CNPE shows an EQE(max) of 7.06% (EQE = 6.30% at 200 cd/m(2)) and a maximum current efficiency (CEmax) of 5.91 cd/A (CE = 5.34 cd/A at 200 cd/m(2)) with a deep-blue emission at CIE of (0.15, 0.09). The electroluminescence performances achieved here are among the highest reported to date for a solution-processed deep-blue fluorescent small molecule, and, to the best of our knowledge, it is the first time that a deep-blue OLED is reported based on the oligo(p-phenyleneethynylene) pi-framework. TDDFT calculations point to facile reverse intersystem crossing (RISC) processes in 2EHO-CNPE from high-lying triplet states to the first singlet excited state (T-2/T-3 -&amp;gt; S-1) (hot-exciton channels) that enable a high radiative exciton yield (eta(r) similar to 69%) breaking the theoretical limit of 25% in conventional fluorescent OLEDs. These results demonstrate that properly designed fluorescent oligo(p-phenyleneethynylenes) can be a key player in high-performance deep-blue OLEDs.</description>
  </descriptions>
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