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Efficient and Long Lived Green Light-Emitting Electrochemical Cells

机译：高效和长期的绿色发光电化学电池

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摘要

The combination of high efficiencies and long lifetime in a single light-emitting electrochemical cell (LEC) device remain a major problem in LEC technology, preventing its application in commercial lighting devices. Three green light-emitting cationic iridium-based complexes of the general composition [Ir((CN)-N-^)(2)((NN)-N-^)][PF6] with 4-Fppy (2-(4-fluorophenyl)pyridinato) as the cyclometalating (CN)-N-^ ligand and 1,10-phenanthroline (1), 4,7-diphenyl-1,10-phenanthroline (bathophenanthroline, bphen, 2), and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuprione, dmbphen, 3) as ancillary (NN)-N-^ ligands are synthesized and characterized. Computational studies are carried out in order to compare the electronic structure of the three ionic transition metal complexes (iTMCs) and provide insights into their potential as LEC emitter materials. LECs are then fabricated with complexes 1-3. Driven under a pulsed current, they display a high luminance and current and power efficiencies. As the LEC based on complex 2 displays the overall best device performance, including the longest lifetime of 474 h, it is selected for subsequent driving conditions optimization. An extraordinary power efficiency of 25 lm W-1 and current efficiency of 30 cd A(-1) are achieved under optimized operation conditions with reduced current density, resulting in a long device lifetime of 720 h. Altogether, ligand design in iTMCs and optimization of the device driving conditions leads to a significant improvement in LEC performance.
机译：在单个发光电化学电池（LEC）装置中的高效率和长寿命长的组合仍然是LEC技术的主要问题，防止其在商业照明装置中的应用。三种绿色发光阳离子铱的一般组合物的复合物[Ir（（（CN）-N - <^>）（（（NN）-N - <^>）] [PF6]，4-FPPY（ 2-（4-氟苯基）吡啶氨酸）作为环荷（CN）-N - -N - <^>配体和1,10-菲啉（1），4,7-二苯基-1,10-菲啉（Bankophyhalline，Bphen，2）合成和表征2,9-二甲基-4,7-二苯基-1,10-菲咯啉（BakoCupriouge，Dmbphen，3）作为辅助（NN）-N - <^>配体。进行计算研究，以比较三种离子过渡金属配合物（ITMC）的电子结构，并为其潜在的潜力提供洞察力。然后用复合物1-3制造LEC。在脉冲电流下驱动，它们显示出高亮度和电流和电源效率。由于基于复杂2的LEC显示了整体最佳设备性能，包括474小时的最长寿命，选择用于随后的驾驶条件优化。在优化的操作条件下，在电流密度降低的优化操作条件下实现了25 LM W-1的特殊功率效率，并且30cd A（-1）的电流效率，导致720小时的长器件寿命长。完全，ITMC中的配体设计和设备驾驶条件的优化导致LEC性能的显着提高。

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  • 来源
    《Advanced Functional Materials》 |2020年第33期|1909809.1-1909809.12|共12页
  • 作者

    Namanga Jude E.; Pei Hanwen; Bousrez Guillaume; Mallick Bert; Smetana Volodymyr; Gerlitzki Niels; Mudring Anja-Verena;

  • 作者单位

    Coppin State Univ Dept Nat Sci 2500 West North Ave Baltimore MD 21216 USA|OSRAM GmbH Corp Innovat ANM EU Berliner Allee 65 D-86153 Augsburg Germany|Ruhr Univ Bochum Anorgan Chem Mat Engn & Characterizat 3 Fak Chem & Biochem D-44780 Bochum Germany;

    Stockholm Univ Dept Mat & Environm Chem Svante Arrhenius Vag 16c S-10691 Stockholm Sweden;

    Stockholm Univ Dept Mat & Environm Chem Svante Arrhenius Vag 16c S-10691 Stockholm Sweden;

    Ruhr Univ Bochum Anorgan Chem Mat Engn & Characterizat 3 Fak Chem & Biochem D-44780 Bochum Germany;

    Stockholm Univ Dept Mat & Environm Chem Svante Arrhenius Vag 16c S-10691 Stockholm Sweden;

    OSRAM GmbH Corp Innovat ANM EU Berliner Allee 65 D-86153 Augsburg Germany|OSRAM OLED GmbH Wernerwerkstr 2 D-93049 Regensburg Germany;

    Ruhr Univ Bochum Anorgan Chem Mat Engn & Characterizat 3 Fak Chem & Biochem D-44780 Bochum Germany|Stockholm Univ Dept Mat & Environm Chem Svante Arrhenius Vag 16c S-10691 Stockholm Sweden;

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  • 正文语种 eng
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  • 关键词

    electroluminescence; iridium; light-emitting electrochemical cells; photoluminescence; transition metal complexes;

    机译：电致发光;铱;发光电化学电池;光致发光;过渡金属配合物;

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