Revealing the Impact of Heat Generation Using Nanographene-Based Light-Emitting Electrochemical Cells

Fresta, Elisa; Dosso, Jacopo; Cabanillas‐González, Juan; Bonifazi, Davide; Costa, Rubén D.

doi:10.1021/acsami.0c06783

Cited by 25 publications

(25 citation statements)

References 60 publications

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“…Thus, our conclusion is that both the OLED and LEC devices exhibit similar qualitative behavior with a steady‐state exciton distribution that is migrating from closer to the anode at room temperature toward the center of the interelectrode gap at elevated temperatures. At this point, we wish to mention that other temperature‐induced effects, such as a changing effective width of the exciton distribution or a shifting exciton environment, [ 12,26 ] also can influence the device performance, but that an investigation on these effects are outside the scope of this study.…”

Section: Resultsmentioning

confidence: 99%

“…[ 11 ] In this context, we mention that Gao and coworkers utilized a temperature‐activated electrolyte phase transition for the attainment of LEC devices with very fast turn‐on time, [ 11a,11b ] and that recent studies established the strong effects that self‐heating can have on the operation of free‐standing LEC devices. [ 11c,12 ] However, we also note that a systematic study aimed at establishing the influence of temperature on LEC operation is lacking. Moreover, a direct comparison between the effects of temperature on OLED and LEC devices based on the same OSC is, to the best of our understanding, nonexistent in the scientific literature.…”

Section: Introductionmentioning

confidence: 99%

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Elucidating Deviating Temperature Behavior of Organic Light‐Emitting Diodes and Light‐Emitting Electrochemical Cells

Ràfols‐Ribé

Gracia‐Espino

Jenatsch

et al. 2020

Advanced Optical Materials

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addition, deliver extremely fast on/off switching that has enabled its current commercial employment in high-end displays, [4] whereas the LEC promises a very low-cost fabrication [2d,5] that can pave the way for its ubiquitous introduction in emerging health care, advertising, and security applications. However, the characteristic soft nature of OSCs can also render their corresponding devices more sensitive to the operational temperature than technologies based on more robust inorganic semiconductors, such as the inorganic light-emitting diode. For OSC-based light-emission devices, it is, for instance, plausible that an increase in temperature due to Joule heating during operation or because of a warmer surrounding can result in a significantly increased rate of chemical and

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elucidating Deviating Temperature Behavior of Organic Light‐Emitting Diodes and Light‐Emitting Electrochemical Cells

Ràfols‐Ribé

Gracia‐Espino

Jenatsch

et al. 2020

Advanced Optical Materials

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“…The so-fabricated LECs were measured with the coupled Avantes spectrophotometers Avaspec-ULS2048L-USB2 and AvaSpec-ULS2048CL-EVO for high UV-Vis and NIR sensitivity, respectively, and a calibrated integrated sphere Avasphere 30-Irrad and a Botest OLT OLED Lifetime-Test System, as described in previous contributions. [13,53] EIS assays were conducted with a potentiostat/galvanostat PGSTAT204 (Metrohm μAutolabIII) with EIS frequency response analyser module (FRA2). The applied voltage ranged from 0 to 4 V. The obtained data were fitted with the Nova software 1.1 using the circuit model shown in Figure S63, Supporting Information, as described in previous contributions.…”

Section: Methodsmentioning

confidence: 99%

BODIPY‐Pt‐Porphyrins Polyads for Efficient Near‐Infrared Light‐Emitting Electrochemical Cells

Fresta

Charisiadis

Cavinato

et al. 2021

Advanced Photonics Research

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The search for deep-red and near-infrared (NIR) small molecule emitters for solid-state lighting devices is an ongoing quest. [1,2] Among the solid-state lighting approaches, light-emitting electrochemical cells (LECs) are of particular interest as they consist of a simple structure, that is, a layer of ionic and neutral electroluminescent materials with ionic additives, sandwiched between two electrodes. [3,4] The working mechanism involves the initial formation of electric double layers (EDLs) upon applying external bias, leading to an efficient charge injection from air stable electrodes and the subsequent formation of p-and n-doped regions flanking the emitting undoped (i) region, in which hole-electron recombination forms radiative excitons. This working mechanism is named p-i-n junction. Importantly, the device performance does not strictly depend on the electrode material, [5] allowing for low-cost and high-throughput solution-based fabrication under ambient air. [3,[6][7][8] While several red emitters have already been implemented in LECs, [1,3,[9][10][11][12][13][14][15][16][17][18][19][20] the best NIR-emitting LECs rely on ionic transition metal complexes. [9,[21][22][23][24][25][26][27] Here, porphyrins could stand out due to their easy synthesis and modification toward NIR emission. [28] Indeed, several groups have recently shown interesting advances in porphyrin-based LECs. In 2016, our group first reported on the effect of the metal core (Zn 2þ , Sn 2þ , Pt 2þ , and Pd 2þ ), of porphyrins on the LEC figures-of-merit, achieving red-emitting devices that were either stable and low efficient (Zn-porphyrin) or highly efficient but poorly stable (Pt-porphyrin). [17] In detail, Pt-porphyrin-based LECs exhibited good efficiencies caused by the heavy metal-induced phosphorescent emission, but also a pronounced electrochemical degradation, leading to low stabilities of a few minutes. This issue can be overcome using a host-guest system to decouple charge transport and exciton recombination. [11,17] In this context, the chemical binding of host-guest units in a dyad-type structure is desired over simple physical blending toward stable and efficient LECs. [11,15,29] For instance, we reported on intramolecular host-guest systems binding 1 BODIPY (BDP) unit to the periphery of a Zn-porphyrin that yielded deep-red LECs with one order of magnitude enhanced stabilities (>1000 h) keeping the low irradiance of the reference devices with the Zn-porphyrin reference. [11] Edman and coworkers reported on the design and synthesis of a host-guest star-shaped diketopyrrolopyrroleÀZn-porphyrin,

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“…The solution was clear and brownyellow and, after the release of the pressure inside the reactor vial, a yellow precipitate formed spontaneously. The needle-shaped crystallites were washed several times with a petroleum ether:ethyl ether 3:1 mixture (yield: 48%, 53 7.66 (tt, J = 6.9, 0.9 Hz, 2H), 7.62-7.57 (m, 1H), 7.42 (ddd, J = 9.2, 6.5, 1.0 Hz, 1H), 7.14 (ddd, J = 7.2, 6.5, 1.2 Hz, 1H), 5.26 (q, J = 7.2 Hz, 2H), 1.77 (t, J = 7.2 Hz, 3H); 13 [1,5-…”

Section: Synthesismentioning

confidence: 99%

“…One of the methods to disrupt aggregates in both the ground and excited states involves the employment of a polymeric matrix. We selected PMMA and PS as polymeric matrices, since they are the most widely used in literature for thin film preparation [52,53]. The results obtained demonstrated that the aggregation behavior was reduced with both matrices.…”

Section: Notes About the Photophysical Propertiesmentioning

confidence: 99%

Microwave-Assisted Synthesis, Optical and Theoretical Characterization of Novel 2-(imidazo[1,5-a]pyridine-1-yl)pyridinium Salts

et al. 2021

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In the last few years, imidazo[1,5-a]pyridine scaffolds and derivatives have attracted growing attention due to their unique chemical structure and optical behaviors. In this work, a series of pyridylimidazo[1,5-a]pyridine derivatives and their corresponding pyridinium salts were synthesized and their optical properties investigated to evaluate the effect of the quaternization on the optical features both in solution and polymeric matrix. A critical analysis based on the spectroscopic data, chemical structures along with density functional theory calculation is reported to address the best strategies to prevent aggregation and optimize the photophysical properties. The obtained results describe the relationship between chemical structure and optical behaviors, highlighting the role of pendant pyridine. Finally, the presence of a positive charge is fundamental to avoid any possible aggregation process in polymeric films.

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Revealing the Impact of Heat Generation Using Nanographene-Based Light-Emitting Electrochemical Cells

Cited by 25 publications

References 60 publications

Elucidating Deviating Temperature Behavior of Organic Light‐Emitting Diodes and Light‐Emitting Electrochemical Cells

Elucidating Deviating Temperature Behavior of Organic Light‐Emitting Diodes and Light‐Emitting Electrochemical Cells

BODIPY‐Pt‐Porphyrins Polyads for Efficient Near‐Infrared Light‐Emitting Electrochemical Cells

Microwave-Assisted Synthesis, Optical and Theoretical Characterization of Novel 2-(imidazo[1,5-a]pyridine-1-yl)pyridinium Salts

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