Three novel iridium (III) complexes containing double chiral atoms for organic light-emitting diodes

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Micro & Nano Letters Pub Date : 2023-06-12 DOI:10.1049/mna2.12169

Gan Cheng, Jun-jian Lu, Li-Ya Zhu, Guangzhao Lu

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Abstract

Chiral iridium (III) complexes are very important for the preparation of circularly polarized organic diodes light-emitting diodes (CP-OLEDs). Three novel iridium (III) complexes, Ir(dnfppy)₂(Cl/pyrrole), Ir(dfppy)₂(dpp), and Ir(tfmqz)₂(sdpp), have been synthesized and characterized, respectively. These iridium (III) complexes emitted deep-blue, blue, and red photoluminescence with high quantum yields (Ir(dnfppy)₂(Cl/Pyrrole): λ_max = 447 nm, F = 62.4%; Ir(dfppy)₂(dpp): λ_max = 467 nm, F = 25%; Ir(tfmqz)₂(sdpp): λ_max = 609 nm, F = 73.7%). Compared with Ir(dnfppy)₂(Cl/pyrrole), the HOMO energy levels of Ir(dfppy)₂(dpp) and Ir(tfmqz)₂(sdpp) were calculated to be −5.71/−5.73 eV, and the LUMO energy levels were increased to be −2.75/−3.36 eV, respectively. The circular dichroism spectra of two pairs of the enantiomers for Ir(dfppy)₂(dpp) or Ir(tfmqz)₂(sdpp) displayed symmetry with opposite polarization between 300 and 600 nm. The maximum external quantum efficiency (EQE_max) of OLEDs based on Ir(tfmpqz)₂(sddp) was 13.8%, showing a relatively low efficiency roll-off with the EQE of 10.7% at 5000 cd/m².

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三种用于有机发光二极管的新型双手性铱（III）配合物

手性铱（III）配合物在制备圆偏振有机二极管发光二极管（CP OLED）方面非常重要。合成并表征了三种新型铱（III）配合物，即Ir（dnfppy）2（Cl/吡咯）、Ir（dfppy）2（dpp）和Ir（tfmqz）2（sdpp）。这些铱（III）配合物以高量子产率发射深蓝色、蓝色和红色光致发光（Ir（dnfppy）2（Cl/Pyrrole）：λmax=447nm，F=62.4%；Ir（dfppy）2（dpp）：λmax=467 nm，F=25%；与Ir（dnfppy）2（Cl/吡咯）相比，Ir（dfppy）2（dpp）和Ir（tfmqz）2（sdpp）的HOMO能级分别为−5.71/−5.73eV，LUMO能级分别增加至−2.75/−3.36eV。Ir（dfppy）2（dpp）或Ir（tfmqz）2（sdpp）的两对对对映体的圆二色性光谱显示对称性，在300和600nm之间具有相反的偏振。基于Ir（tfmpqz）2（sddp）的OLED的最大外量子效率（EQEmax）为13.8%，在5000cd/m2时表现出相对较低的效率衰减，EQE为10.7%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Micro & Nano Letters 工程技术-材料科学：综合

CiteScore

3.30

自引率

0.00%

发文量

审稿时长

2.8 months

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