A near infrared light emitting electrochemical cell with a 2.3 V turn-on voltage

Bideh, Babak Nemati; Shahroosvand, Hashem; Sousaraei, Ahmad; Cabanillas‐González, Juan

doi:10.1038/s41598-018-36420-1

Cited by 16 publications

(7 citation statements)

References 51 publications

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“…Bideh et al. reported efficient NIR LECs based on a binuclear ruthenium phenanthroimidazole complex (complex 34 , Figure 3) in 2017 [54] . In comparison to the complex reported in an earlier study, [45] dinuclear ruthenium complex 34 showed a red‐shift of ca.…”

Section: Materials For Long‐wavelength Lecsmentioning

confidence: 83%

“…In 2019, Bideh et al proposed novel ruthenium complexes with πextended phenanthroimidazoles which differ on their N^N ligands. [47] The use of dimethyl electron donating groups along with the π-extended phenanthroimidazole moiety promotes ambipolar transport. The LECs employing complexes 21 and 22 (Figure 2) showed deep-red EL emission peaks at 664 and 695 nm, respectively.…”

Section: Chemistry-a European Journalmentioning

confidence: 99%

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Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Lin

2022

Chemistry A European J

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Long‐wavelength light‐emitting electrochemical cells (LECs) are potential deep‐red and near infrared light sources with solution‐processable simple device architecture, low‐voltage operation, and compatibility with inert metal electrodes. Many scientific efforts have been made to material design and device engineering of the long‐wavelength LECs over the past two decades. The materials designed the for long‐wavelength LECs cover ionic transition metal complexes, small molecules, conjugated polymers, and perovskites. On the other hand, device engineering techniques, including spectral modification by adjusting microcavity effect, light outcoupling enhancement, energy down‐conversion from color conversion layers, and adjusting intermolecular interactions, are also helpful in improving the device performance of long‐wavelength LECs. In this review, recent advances in the long‐wavelength LECs are reviewed from the viewpoints of materials and device engineering. Finally, discussions on conclusion and outlook indicate possible directions for future developments of the long‐wavelength LECs. This review would like to pave the way for the researchers to design materials and device engineering techniques for the long‐wavelength LECs in the applications of displays, bio‐imaging, telecommunication, and night‐vision displays.

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Section: Materials For Long‐wavelength Lecsmentioning

confidence: 83%

Section: Chemistry-a European Journalmentioning

confidence: 99%

Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Lin

2022

Chemistry A European J

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“…Performance of LECs can also be improved by providing more balanced charge transportation within the emissive layer. This parameter was examined with a series of three complexes Ru-16-Ru-18 where an ambipolar charge transportation ability was provided by attaching a phenanthroimidazole ligand [108]. As an interesting point and in addition to the improvement of the charge transportation, use of an ancillary ligand with extended aromaticity both contribute to reducing the HOMO-LUMO gap and red-shift the PL emission.…”

Section: Metal Complexes Using Nir Emittersmentioning

confidence: 99%

Recent Advances on Metal-Based Near-Infrared and Infrared Emitting OLEDs

2019

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During the past decades, the development of emissive materials for organic light-emitting diodes (OLEDs) in infrared region has focused the interest of numerous research groups as these devices can find interest in applications ranging from optical communication to defense. To date, metal complexes have been most widely studied to elaborate near-infrared (NIR) emitters due to their low energy emissive triplet states and their facile access. In this review, an overview of the different metal complexes used in OLEDs and enabling to get an infrared emission is provided.

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“…The first iTMC-based LEC, fabricated in 1996 by Lee et al, showed that Ru(II) polypyridine complexes exhibit favorable electroluminescence (EL) and thermal stability properties . Much research on Ru(II) complexes has been done in the past decade to increase the efficiency of LECs. − To date, [Ru(bpy) 3 ] +2 and its similar complexes have been used in most studies due to their high metal-to-ligand charge transfer (MLCT), long half-time of the excited state, and high EQE in solution and at room temperature …”

Section: Introductionmentioning

confidence: 99%

Full Solution Process of a Near-Infrared Light-Emitting Electrochemical Cell Based on Novel Emissive Ruthenium Complexes of 1,10-Phenanthroline-Derived Ligands and a Eutectic Alloy as the Top Electrode

et al. 2023

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Near-infrared luminescent materials have recently received considerable attention for a large number of applications, including in solid-state lighting, as bioimaging agents, as photovoltaic cells, and in the telecommunication industry. By adding diverse electron-donating or withdrawing groups on ancillary ligands based on benzenethiol-phenanthroline, we synthesized and optoelectronically characterized a series of novel ionic ruthenium complexes, namely RuS, RuSCl, RuSMe, and RuSNH2, for using in a light-emitting electrochemical cell. The synthesized complexes are intense red emitters in the range of 584–605 nm in solution, which depends on the substitutions of electron donor/acceptor moieties on the ancillary ligands. To find a suitable quantum mechanical approach, benchmark calculations based on time-dependent density functional theory were carried out on these complexes. Our benchmark revealed that the M06-L method has results close to those of the experiment. Furthermore, to gain a deeper insight into electronic transitions, several excitation processes were investigated at the TD-DFT-SMD-MN12-L/gen level. The results showed that in the designed complexes, the dominant transition is between the 4d Z 2 electron of Ru (particle) and the π* orbitals of the ancillary ligand (hole). The single-layer devices, including these complexes along with a Ga/In cathode by a facile deposition method without the addition of any electron or hole transport layers, were fabricated and displayed red (678 nm) to near-infrared (701 nm) emission as well as a decrease of turn-on voltage from 3.85 to 3.10 V. In particular, adding a methyl group to the ancillary ligand in the complex RuSNH2 increases the external quantum efficiency to 0.55%, one of the highest observed values in the ruthenium phenanthroline family. This simple structure of the device lets us develop the practical applications of light-emitting electrochemical cells based on injection and screen-printing methods, which are very promising for the vacuum-free deposition of top electrodes.

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A near infrared light emitting electrochemical cell with a 2.3 V turn-on voltage

Cited by 16 publications

References 51 publications

Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Recent Advances on Metal-Based Near-Infrared and Infrared Emitting OLEDs

Full Solution Process of a Near-Infrared Light-Emitting Electrochemical Cell Based on Novel Emissive Ruthenium Complexes of 1,10-Phenanthroline-Derived Ligands and a Eutectic Alloy as the Top Electrode

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