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Host-Free Yellow-Green Organic Light-Emitting Diodes with External Quantum Efficiency over 20% Based on a Compound Exhibiting Thermally Activated Delayed Fluorescence

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    Host-Free Yellow-Green Organic Light-Emitting Diodes with External Quantum Efficiency over 20% Based on a Compound Exhibiting Thermally Activated Delayed Fluorescence
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    • Xiaoqing Zhang
      Xiaoqing Zhang
      Center for Organic Photonics and Electronics (COPE), School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
      More by Xiaoqing Zhang
      Orcidhttp://orcid.org/0000-0003-1930-623X
    • Matthew W. Cooper
      Matthew W. Cooper
      Center for Organic Photonics and Electronics (COPE), School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
      More by Matthew W. Cooper
      Orcidhttp://orcid.org/0000-0002-3589-8688
    • Yadong Zhang
      Yadong Zhang
      Center for Organic Photonics and Electronics (COPE), School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
      More by Yadong Zhang
    • Canek Fuentes-Hernandez
      Canek Fuentes-Hernandez
      Center for Organic Photonics and Electronics (COPE), School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
      More by Canek Fuentes-Hernandez
      Orcidhttp://orcid.org/0000-0001-7958-3699
    • Stephen Barlow
      Stephen Barlow
      Center for Organic Photonics and Electronics (COPE), School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
      More by Stephen Barlow
      Orcidhttp://orcid.org/0000-0001-9059-9974
    • Seth R. Marder
      Seth R. Marder
      Center for Organic Photonics and Electronics (COPE), School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
      More by Seth R. Marder
      Orcidhttp://orcid.org/0000-0001-6921-2536
    • Bernard Kippelen*
      Bernard Kippelen
      Center for Organic Photonics and Electronics (COPE), School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
      *E-mail: [email protected]
      More by Bernard Kippelen
      Orcidhttp://orcid.org/0000-0002-8417-7051
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2019, 11, 13, 12693–12698
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    https://doi.org/10.1021/acsami.8b18798
    Published March 5, 2019
    Copyright © 2019 American Chemical Society
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    Abstract

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    Thermally activated delayed fluorescent (TADF) materials are advantageous as emitters in organic light-emitting diodes (OLEDs) due to their ability to utilize all excited states formed by charge recombination for light emission, potentially leading to 100% internal quantum efficiency. As in conventional fluorescent or phosphorescent OLEDs, TADF emitters are commonly doped at a relatively low concentration in a host matrix. However, increasing evidence suggests that balanced ambipolar transport properties and small aggregation-induced fluorescence quenching allow TADF emitters to be used alone in so-called host-free OLEDs. Here, we report host-free OLEDs in which the emissive layers (EMLs) consist solely of a yellow-green-emitting TADF compound, 5,5′-(2,3,5,6-tetra(carbazol-9-yl)-1,4-phenylene)bis(2-(4-(tert-butyl)phenyl)-1,3,4-oxadiazole), TCZPBOX. Devices with this host-free EML yield a maximum external quantum efficiency (EQE) of 21%, current efficacy (CE) of 73 cd/A, and power efficacy (PE) of 79 lm/W at a luminance of 10 cd/m2. At a high luminance of 10,000 cd/m2, a high EQE of 13% is maintained. A maximum luminance of 120,000 cd/m2 is reached at an applied voltage of 9.8 V. When TCZPBOX was doped in the host 2,6-di(carbazol-9-yl)-pyridine (PYD2) at 40 wt %, the device yielded a maximum EQE of 28%, CE of 94 cd/A, and PE of 100 lm/W at 10 cd/m2.

    Copyright © 2019 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.8b18798.

    • Synthesis of TCZPBOX, thermogravimetric analysis (TGA), cyclic voltammetry (CV), transient photoluminescence, solvatochromic data, and details of OLED fabrication and measurements (PDF)

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    This article is cited by 27 publications.

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2019, 11, 13, 12693–12698
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.8b18798
    Published March 5, 2019
    Copyright © 2019 American Chemical Society
    Request reuse permissions

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