Rare Earth Complexes with 5d–4f Transition: New Emitters in Organic Light-Emitting Diodes

Wang, Liding; Fang, Peiyu; Zhao, Zifeng; Huang, Yanyi; Liu, Zhiwei; Bian, Zuqiang

doi:10.1021/acs.jpclett.2c00400

Cited by 24 publications

(10 citation statements)

References 50 publications

(91 reference statements)

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“…Consequently, injected holes would be captured by Eu 2 (L3) 2 I 4 instead of PCzAc while electrons transferred from the host material to Eu 2 (L3) 2 I 4 , then hole-electron recombination may dominate on the Eu(II) complexes without energy transfer from host molecule, which is similar with the mechanism observed in d-f transition Ce(III) complex based OLEDs. [18] Therefore, the high V on might be attributed to the carrier recombination dominantly occurs on the doping materials instead of the host materials in this spincoated OLEDs, which is consistent with our previous Eu(II) complexes based OLEDs fabricated by VTE.…”

Section: Wwwadvopticalmatdesupporting

confidence: 91%

Europium(II) Complexes with Substituted Tris(2‐aminoethyl)amine/Triethanolamine Ligand and their Application in Blue Spin‐Coated Organic Light‐Emitting Diodes

Huo

et al. 2022

Advanced Optical Materials

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Luminescent Eu(II) complexes with characteristic d–f transitions have potential applications in many fields, especially organic light‐emitting diodes (OLEDs), due to their satisfactory advantages including short excited‐state lifetimes, 100% theoretical exciton utilization efficiency and tunable emission colors. Up to now, most light‐emitting layers in OLEDs are typically fabricated through high‐vacuum thermal evaporation process, which is uneconomical for large‐area and multi‐dopant devices. In this work, eight Eu(II) complexes with substituted tris(2‐aminoethyl)amine or triethanolamine ligands are designed and synthesized, and their structural and photophysical properties are studied. These complexes exhibit tunable maximum emission wavelengths in the range of 437–553 nm and high photoluminescence quantum yields up to 75%. Furthermore, this work demonstrates the application of Eu(II) complex in solution‐processed OLEDs with high efficiency and luminance for the first time. The optimized device show a maximum external quantum efficiency of 9.2% and a maximum luminance of 1780 cd m−2 with an emission peak at 485 nm.

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Section: Wwwadvopticalmatdesupporting

confidence: 91%

Europium(II) Complexes with Substituted Tris(2‐aminoethyl)amine/Triethanolamine Ligand and their Application in Blue Spin‐Coated Organic Light‐Emitting Diodes

Huo

et al. 2022

Advanced Optical Materials

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“…Rare earth complexes with parity-allowed d–f transition exhibit high photoluminescence quantum yield (PLQY) up to 100%, short excited-state lifetime to tens of nanoseconds, tunable emission covering three primary colors, and exceptional thermal stability with high decomposition temperature. − Therefore, d–f transition rare earth complexes have been regarded as a promising candidate material for display applications.…”

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confidence: 99%

Electrohydrodynamically Printed d–f Transition Cerium(III) Complex

Du,

Fang,

Luo

et al. 2024

J. Phys. Chem. Lett.

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The d−f transition rare earth complexes have recently emerged as a promising candidate for display applications due to the parity-allowed transition, high photoluminescence quantum yield (PLQY), short excited lifetime, and tunable emissions. Besides, inkjet printing has been regarded as an important technique for realizing full-color display. However, inkjet-printed d−f transition rare earth complexes have not been investigated. Herein, for the first time, we explored d−f transition cerium(III) complex 2-Me as the luminescent material by inkjet printing. With 1,2-dichlorobenzene as solvent and polystyrene as an additive, 2-Me film exhibits a similar emission peak and excited-state lifetime with 2-Me powder and a high PLQY of 45%, demonstrating the excellent stability of 2-Me ink. Finally, we suppressed the coffee ring effect and prepared the first inkjet-printed pattern ''HUST'' composed of d−f transition rare earth complex ink with uniform blue fluorescence. Our pioneering work provides a promising alternative for inkjet printing inks.

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“…Since then, with continuous and important progress arising from research on rare earth luminescent materials, applications have consistently been expanded. Today, rare earth luminescent materials are used in almost every aspect of photonics and optoelectronics, for example, in lighting 6 , 7 , displays 8 , 9 , sensing 10 , optical information storage 11 , energy conservation 12 , and biomedicine 13 , 14 . This booming momentum prompted us to edit this album and summarize the latest progress in a timely manner and provide a reference for further developments with rare earth luminescent materials.…”

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confidence: 99%