The role of the polymer solid electrolyte molecular weight in light-emitting electrochemical cells

Hernandez‐Sosa, Gerardo; Eckstein, Ralph; Tekoglu, Serpil; Becker, T.; Mathies, Florian; Lemmer, Uli; Mechau, Norman

doi:10.1016/j.orgel.2013.05.040

Cited by 25 publications

(16 citation statements)

References 23 publications

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“…The film morphology and, in particular, the intermixing of the SPE and the emitter material have been reported to be crucial to LEC device performance373839. Different parameters such as crystallization, molecular weight, hydrophobicity or hydrophilicity can affect the miscibility of the SPE and the emitter.…”

Section: Resultsmentioning

confidence: 99%

Biodegradable Polycaprolactone as Ion Solvating Polymer for Solution-Processed Light-Emitting Electrochemical Cells

Jürgensen

Zimmermann

Morfa

et al. 2016

Sci Rep

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In this work, we demonstrate the use of the biodegradable polymer polycaprolactone (PCL) as the ion solvating polymer in solution-processed light-emitting electrochemical cells (LEC). We show that the inclusion of PCL in the active layer yields higher ionic conductivities and thus contributes to a rapid formation of the dynamic p-i-n junction and reduction of operating voltages. PCL shows no phase separation with the emitter polymer and reduces film roughness. The devices show light-emission at voltages as low as 3.2 V and lifetimes on the order of 30 h operating above 150 cd m−2 with turn-on times <20 s and current and luminous efficacies of 3.2 Cd A−1 and 1.5 lm W−1 respectively.

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Section: Resultsmentioning

confidence: 99%

Biodegradable Polycaprolactone as Ion Solvating Polymer for Solution-Processed Light-Emitting Electrochemical Cells

Jürgensen

Zimmermann

Morfa

et al. 2016

Sci Rep

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“…The planar LEC was fabricated on a 15 mm × 15 mm × 1 mm sapphire substrate inside a nitrogen‐filled glove‐box/evaporator system. A cyclohexanone solution of poly‐(′‐ethylhexyloxy)‐‐methoxy‐‐phenylenevinylene (MEH‐PPV), polyethylene oxide (PEO) and potassium triflate (KTf) was prepared to have a composition of 10 mg (MEH‐PPV): 5 mg (PEO): 1.2 mg (KTf). The LEC film was spin cast from the solution and subsequently dried for five hours at 50 °C.…”

Section: Methodsmentioning

confidence: 99%

“…The polymer light‐emitting electrochemical cell (LEC) is a mixed ionic/electronic device and the subject of numerous recent studies . The interest in LECs is spurred by their application potential as well as a desire to understand the interesting underlying science of their operation.…”

Section: Introductionmentioning

confidence: 99%

Scanning photocurrent and PL imaging of a frozen polymer p-i-n junction

AlTal

Gao

2014

Phys. Status Solidi RRL

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Polymer light‐emitting electrochemical cells (LECs) are two‐terminal, solid state devices with a mixed ionic/electronic conductor as the active layer. Once activated by a DC voltage or current, a doping‐induced homojunction dictates the electrical and optical response of the LEC, making it highly unique and attractive among organic devices. However, the depletion width, a fundamental parameter of any semiconductor homojunction, has never been determined experimentally for a static LEC junction. In this study, we apply spatially resolved photocurrent and photoluminescence (PL) scanning to an extremely large planar LEC that had been turned on to emit strongly then subsequently frozen. These concerted scanning and imaging studies depict a p–i–n junction structure in which the peak built‐in electric field lies at the interface between the intrinsic region and the p‐doped region. The corresponding 18 μm depletion width is very small compared to the 700 μm interelectrode spacing. A 700 μm planar polymer light‐emitting electrochemical cell has been turned on, frozen and probed optically. Scanning PL and photocurrent imaging reveals a p–i–n doping profile. Photocurrent is only detected over a region of 18 μm centered at the i/p junction. Peak PL occurs near the center of the intrinsic region. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

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“…15 V for the highest and lowest amounts of PSE respectively. This effect is related to the effective ionic conductivity of the blend and relative amount of PSE . A larger ratio of PSE facilitates ionic transport and as a consequence the more rapid formation of the p and n doping fronts .…”

Section: Performance Characteristics Of the Lecs Prepared With Differmentioning

confidence: 99%

“…It has been reported that the M w of the polymer contained in the PSE affects its ionic mobility, the film morphology, and consequently the performance of the LECs . Moreover, the viscosity of a polymer is proportional to its M w and therefore changing the M w would be a viable route to modify the rheology, the printing outcome, and the performance of the devices.…”

Section: Performance Characteristics Of the Lecs Prepared With Differmentioning

confidence: 99%

The Compromises of Printing Organic Electronics: A Case Study of Gravure‐Printed Light‐Emitting Electrochemical Cells

et al. 2014

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The role of the polymer solid electrolyte molecular weight in light-emitting electrochemical cells

Cited by 25 publications

References 23 publications

Biodegradable Polycaprolactone as Ion Solvating Polymer for Solution-Processed Light-Emitting Electrochemical Cells

Biodegradable Polycaprolactone as Ion Solvating Polymer for Solution-Processed Light-Emitting Electrochemical Cells

Scanning photocurrent and PL imaging of a frozen polymer p-i-n junction

The Compromises of Printing Organic Electronics: A Case Study of Gravure‐Printed Light‐Emitting Electrochemical Cells

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