Electron transport and electroluminescent efficiency of conjugated polymers

Tseng, Shin Rong; Chen, Y. S.; Meng, Hsin‐Fei; Lai, Hang–Chin; Yeh, Chen-Pin; Horng, Sheng Fu; Liao, Hua; Hsu, Chain‐Shu

doi:10.1016/j.synthmet.2008.08.017

Cited by 34 publications

(11 citation statements)

References 28 publications

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“…In each case, the effective mobility reported in Table 1 is in the order of 10 − 5 cm 2 V − 1 s − 1 . This may be seem in disagreement with previous measurements of Tseng et al ., where reported electron and hole mobilities in Super Yellow are 4.1 × 10 − 7 cm 2 V − 1 s − 1 and 4.1 × 10 − 7 cm 2 V − 1 s − 1 respectively 21 . However, these low values are derived from current- voltage characteristics of single carrier devices.…”

Section: Resultsmentioning

confidence: 88%

“…Interestingly, Super Yellow has similar mobility properties for both holes and electrons. Such a balanced ambipolar transport is a crucial property required for obtaining efficient OLEDs 21 , while in most conjugated polymers the hole mobility is usually higher than the electron mobility. Nonetheless, it should be noted, that most of literature reports focus on Super Yellow thin films prepared by spin coating technique.…”

Section: Introductionmentioning

confidence: 99%

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Inkjet Printing of Super Yellow: Ink Formulation, Film Optimization, OLEDs Fabrication, and Transient Electroluminescence

Amruth¹,

Szymański²,

Luszczynska³

et al. 2019

Sci Rep

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Inkjet printing technique allows manufacturing low cost organic light emitting diodes (OLEDs) in ambient conditions. The above approach enables upscaling of the OLEDs fabrication process which, as a result, would become faster than conventionally used vacuum based processing techniques. In this work, we use the inkjet printing technique to investigate the formation of thin active layers of well-known light emitting polymer material: Super Yellow (poly(para-phenylene vinylene) copolymer). We develop the formulation of Super Yellow ink, containing non-chlorinated solvents and allowing stable jetting. Optimization of ink composition and printing resolution were performed, until good quality films suitable for OLEDs were obtained. Fabricated OLEDs have shown a remarkable characteristics of performance, similar to the OLEDs fabricated by means of spin coating technique. We checked that, the values of mobility of the charge carriers in the printed films, measured by transient electroluminescence, are similar to the values of mobility measured in spin coated films. Our contribution provides a complete framework for inkjet printing of high quality Super Yellow films for OLEDs. The description of this method can be used to obtain efficient printed OLEDs both in academic and in industrial settings.

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Inkjet Printing of Super Yellow: Ink Formulation, Film Optimization, OLEDs Fabrication, and Transient Electroluminescence

Amruth¹,

Szymański²,

Luszczynska³

et al. 2019

Sci Rep

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“…Their voltage dependencies are shown in Figure 4a,b. It is known from the literature that the mobilities of the holes and electrons are almost equal in the SY [9], and there is a barrier ΔE equal to about 0.3 V at the PEDOT:PSS/SY interface (Figure 1). Thus, the density of the injected holes should be noticeably smaller than that of electrons, and the recombination interface should be localized in the vicinity (at the coordinate L0, Figure 5) to the PEDOT:PSS/SY interface.…”

Section: The Fully Protected Pledsmentioning

confidence: 99%

“…Poly-(para-phenylene vinylene) copolymer, known as Super Yellow (SY) [ 7 ], is one of the most widely used conjugated polymers for solution-processable PLEDs [ 8 ]. An important and desirable feature of the Super Yellow is its high quantum efficiency, and similar charge mobility for both the holes and electrons [ 9 ]. Such a balanced ambipolar transport is crucial for an efficient PLED, although in most conjugated polymers the hole mobility is usually higher than the electron mobility.…”

Section: Introductionmentioning

confidence: 99%

Three Destinies of Solution-Processable Polymer Light-Emitting Diodes under Long-Time Operation

et al. 2021

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The article describes three different ways of polymer light-emitting diode (PLED) degradation, caused by damage of the protective layer. The electroluminescence and charge-transport properties of a completely encapsulated diode, the diodes with a leaky protective layer and diodes without encapsulation were compared under long-time exploitation. The studied devices incorporated Super Yellow light-emitting poly-(1,4-phenylenevinylene) PPV copolymer as an electroluminescence component, and (poly-(3,4-ethylenedioxythiophene)–poly-(styrene sulfonate) (PEDOT:PSS) as a charge-transport layer between the indium tin oxide (ITO) anode and aluminum–calcium cathode. To analyze the PLED degradation mechanism regarding charge transport, impedance spectroscopy was used. The values of resistance and capacitance of the internal layers revealed an effect of applied voltage on charge carrier injection and recombination. The factors responsible for the device degradation were analyzed on a macromolecular level by comparing the plots of voltage dependence of resistance and capacitance at different operation times elapsed.

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“…Thus, it is a crucial task during OLED device design, to optimize the charge carrier balance, which is mainly determined by two physical parameters: injection barrier height and charge carrier mobility [3].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the electron injection in polymer light-emitting diodes using a sodium stearate/aluminum bilayer cathode

Siemund

Bröcker

Göbel

2013

Organic Electronics

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Electron transport and electroluminescent efficiency of conjugated polymers

Cited by 34 publications

References 28 publications

Inkjet Printing of Super Yellow: Ink Formulation, Film Optimization, OLEDs Fabrication, and Transient Electroluminescence

Inkjet Printing of Super Yellow: Ink Formulation, Film Optimization, OLEDs Fabrication, and Transient Electroluminescence

Three Destinies of Solution-Processable Polymer Light-Emitting Diodes under Long-Time Operation

Enhancing the electron injection in polymer light-emitting diodes using a sodium stearate/aluminum bilayer cathode

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