Electroluminescence: From White to Red: Electric‐Field Dependent Chromaticity of Light‐Emitting Electrochemical Cells based on Archetypal Porphyrins (Adv. Funct. Mater. 37/2016)

Weber, Michael; Wittmann, Judith E.; Burger, Alexandra; Malcıoğlu, Osman Barış; Segarra‐Martí, Javier; Hirsch, Andreas; Coto, Pedro B.; Bockstedte, Michel; Costa, Rubén D.

doi:10.1002/adfm.201670243

Cited by 5 publications

(3 citation statements)

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“…EDLs generate strong electrical fields, and the potential drop then compensates the initial mismatch in energy between the Fermi level of the cathode (anode) and the lowest unoccupied molecular orbital (LUMO)/highest occupied molecular orbital (HOMO) level of the organic semiconductor over the EDLs. This peculiar operational mechanism enables the use of air‐stable electrodes, low driving voltages close to the band gap potential of the light‐emitting species used, and the implementation of novel emitting species like perovskites, cyanine dyes, and small‐molecules …”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement by ZnO Nanoparticle Layer in Hybrid Ionic Transition Metal Complex‐Light‐Emitting Electrochemical Cells (iTMC‐LECs)

Marcantonio

Gellner

Namanga

et al. 2016

Adv Materials Technologies

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Light‐emitting electrochemical cells (LECs) are solution processable solid‐state light sources comprising in their simplest architecture an ionic emissive layer in between of two electrodes. Although LECs possess several advantages that make them promising candidates for future large‐area low‐cost lighting technologies, their device wall‐plug efficacies remain so far moderate on the order of a few lumens per watt. One of the reasons therefore is considered to be the charge imbalance within the device. Here, a hybrid LEC device concept is introduced, whereby an additional layer of zinc oxide (ZnO) nanoparticles at the cathode side supports electron injection into the active light‐emitting layer and boosts the performance of the Ir‐based ionic transition metal complex LEC (iTMC‐LEC). The brightness and efficacy of the devices can be increased in average by more than 70% by the implementation of the additional inorganic layer. The time to reach the maximum brightness can be reduced in average by a factor of 7, which is attributed to an improved electron/hole balance in the device due to enhanced electron injection into the active iTMC layer.

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Section: Introductionmentioning

confidence: 99%

Performance Enhancement by ZnO Nanoparticle Layer in Hybrid Ionic Transition Metal Complex‐Light‐Emitting Electrochemical Cells (iTMC‐LECs)

Marcantonio

Gellner

Namanga

et al. 2016

Adv Materials Technologies

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“…Additionally, the minimum average voltage of the devices remains close to the steady-state value along the device operation time, depicting that there are no signs of charge transport issues or chemical degradation in the all LECs (Fig. 5b-d) 75 . Interestingly, the initial voltage for the LECs based on Ir1 and Ir2 decreases to 3 V after about 60 min, while for Ir3 + this occurs after 10 min which might be related to the enhancement of ionic mobility of the emissive layer that is induced by tethered methyl pyridinium moiety (PyCH 3 + ) on the Ir3 + complex 37,45 .…”

Section: Electroluminescent Properties Of Lecsmentioning

confidence: 72%

Phenanthroimidazole as molecularly engineered switch for efficient and highly long-lived light-emitting electrochemical cell

Bideh

Sousaraei

Arani

2023

Sci Rep

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Light-emitting electrochemical cells (LECs) based on Ir(III) complexes owing to the superior advantages exhibit high potential for display and lighting applications. Herein, a series of Ir(III) complexes based on phenanthroimidazole (PI) as an ancillary ligand were synthesized to achieve efficient and highly stable yellow-to-orange LEC devices with fast response. These complexes exhibit appropriate electrochemical stability and significant suppression of concentration quenching in the thin films compared to the archetype complex. The fabricated LECs showed remarkably long device lifetimes over 1400 and 2100 h and external quantum efficiency of 2 and 3% for yellow and orange-LECs, respectively. The obtained t1/2 for yellow LEC is much higher than archetype [Ir(ppy)2(phen)]+ and their phenanthroline-based analogues reported so far. The incorporation of an ionic tethered functional group on PI, improved the mobility of the emissive layer and reduced the device turn-on time by 75–88%. This study shows a facile functionalization and characterization of the PI ligand as well as its potential application in optoelectronic devices (OLED).

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“…5a-c). 43 Interestingly, the initial voltage for LECs based on Ir1 and Ir2 decreases to 3 volts after about 60 minutes, while for Ir3 + this occurs after 10 minutes which might be related to the enhancement of ionic mobility of emissive layer that is induced by tethered methyl pyridinium moiety (PyCH 3 + ) on the Ir3 + complex. 19,23 Under the constant current, the LECs based on Ir1, Ir2 and Ir3 + give maximum luminance of 870, 563 and 45 cd.m -2 and external quantum e ciency (EQE) of 3.1, 2.5 and 0.24%, respectively.…”

Section: Photophysical Characterizationsmentioning

confidence: 97%

Phenanthroimidazole as Molecularly Engineered Switch for Efficient and Highly Long-lived Light-Emitting Electrochemical Cell.

Bideh

Sousaraei

Arani

2022

Preprint

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Although, light-emitting electrochemical cells (LECs) based on Ir(III) complexes owing to the superior advantages exhibit high potential for display and lighting applications, they still suffer from relatively low stability and sluggish response time. To mitigate this challenge, herein, a series of Ir(III) complexes based on phenanthroimidazole (PI) as ancillary ligand were functionalized to achieve efficient, highly stable yellow to orange LEC devices with fast response. These complexes exhibit appropriate electrochemical stability and significant suppression of concentration quenching in the thin films compare to archetype complex. Concerning, the fabricated LECs showed remarkable long device lifetime over 1400 and 2100 hours and EQE of 2 and 3% for yellow and orange-LECs, respectively, in which obtained t1/2 for yellow LEC is among the highest value for cationic iridium (III) complexes based yellow-LECs reported so far. Subsequently, incorporation of ionic tethered functional group on PI, improved the mobility of emissive layer, reducing the device turn-on time around 75–88%. This study represents facile functionalization and characterization of PI ligand and its potential application in optoelectronic devices (OLED).

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Electroluminescence: From White to Red: Electric‐Field Dependent Chromaticity of Light‐Emitting Electrochemical Cells based on Archetypal Porphyrins (Adv. Funct. Mater. 37/2016)

Cited by 5 publications

References 0 publications

Performance Enhancement by ZnO Nanoparticle Layer in Hybrid Ionic Transition Metal Complex‐Light‐Emitting Electrochemical Cells (iTMC‐LECs)

Performance Enhancement by ZnO Nanoparticle Layer in Hybrid Ionic Transition Metal Complex‐Light‐Emitting Electrochemical Cells (iTMC‐LECs)

Phenanthroimidazole as molecularly engineered switch for efficient and highly long-lived light-emitting electrochemical cell

Phenanthroimidazole as Molecularly Engineered Switch for Efficient and Highly Long-lived Light-Emitting Electrochemical Cell.

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