Exciton quenching at PEDOT:PSS anode in polymer blue-light-emitting diodes

Abbaszadeh, Davood; Wetzelaer, Gert‐Jan A. H.; Nicolai, Herman T.; Blom, Paul W. M.

doi:10.1063/1.4903952

Cited by 20 publications

(13 citation statements)

References 23 publications

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“…To avoid the near-field quenching caused by electrode, in most LHP-LEDs a conductive poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) film is selected as a spacer, which also can enhance hole injection from ITO anode (Figure b and Figure a,b). ,,, In principle, the metallic PEDOT:PSS film is also regarded as an exciton quencher because of its highly electrical conductivity and interfacial defects. , Therefore, an organic semiconductor film, e.g ., poly(4-butylphenyldiphenylamine) (poly-TPD), with low density of charge carriers is adopted as a buffer layer to eliminate the exciton quenching caused by PEDOT:PSS. , Moreover, this organic hole transport film is supposed to enhance hole injection into the recombination zone because there is a large mismatch between the deep valence band of LHPs and the Fermi level of PEDOT:PSS. ,,, …”

Section: Applicationsmentioning

confidence: 99%

“…404,1078,1082,1187 In principle, the metallic PEDOT:PSS film is also regarded as an exciton quencher because of its highly electrical conductivity and interfacial defects. 1078,1193 Therefore, an organic semiconductor film, e.g., poly(4butylphenyldiphenylamine) (poly-TPD), with low density of charge carriers is adopted as a buffer layer to eliminate the exciton quenching caused by PEDOT:PSS. 396,1078 Moreover, this organic hole transport film is supposed to enhance hole injection into the recombination zone because there is a large mismatch between the deep valence band of LHPs and the Fermi level of PEDOT:PSS.…”

Section: Applicationsmentioning

confidence: 99%

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State of the Art and Prospects for Halide Perovskite Nanocrystals

et al. 2021

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Metal-halide perovskites have rapidly emerged as one of the most promising materials of the 21st century, with many exciting properties and great potential for a broad range of applications, from photovoltaics to optoelectronics and photocatalysis. The ease with which metal-halide perovskites can be synthesized in the form of brightly luminescent colloidal nanocrystals, as well as their tunable and intriguing optical and electronic properties, has attracted researchers from different disciplines of science and technology. In the last few years, there has been a significant progress in the shape-controlled synthesis of perovskite nanocrystals and understanding of their properties and applications. In this comprehensive review, researchers having expertise in different fields (chemistry, physics, and device engineering) of metal-halide perovskite nanocrystals have joined together to provide a state of the art overview and future prospects of metal-halide perovskite nanocrystal research.

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Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

State of the Art and Prospects for Halide Perovskite Nanocrystals

et al. 2021

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“…For the blend device, due to the reduced trap density, as well as a transition from hole‐dominated to electron‐dominated transport, the recombination zone quickly moves to the anode with increasing voltage and anode quenching becomes important. Contrary to the pristine PLED, for the blend PLED, the current efficiency therefore increases sharply at low voltage and has a roll‐off around 8 V. We have shown that, in a system with a lower trap density, the efficiency roll‐off at higher bias is due to quenching of excitons at the PEDOT:PSS anode, which quenches excitons equally efficient as the metallic cathode . To illustrate the position and spatial distribution of the recombination zone, the recombination profile is calculated for both pristine and blend PLEDs with a thickness of 300 nm at 100 A m −2 , as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…[24] To illustrate the position and spatial distribution of the recombination zone, the recombination profile is calculated for both pristine and blend PLEDs with a thickness of 300 nm at 100 A m −2 , as shown in Figure 6. The profile shows that in the blend PLED, contrary to the pristine device, only anode quenching is important.…”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

Efficient Blue Polymer Light‐Emitting Diodes with Electron‐Dominated Transport Due to Trap Dilution

Abbaszadeh

Blom

2016

Adv Elect Materials

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As is common for many conjugated polymers used in light‐emitting diodes (PLEDs), the charge transport in blue‐emitting polyspirobifluorene (PSF) copolymerized with the hole transport unit – N,N,N′N′‐tetraaryldiamino (TAD) biphenyl – is dominated by holes. Although the free electron mobility is an order of magnitude higher than the hole mobility, the electron transport is strongly hindered by traps. By diluting PSF‐TAD with the wide band gap polymer poly(9,9‐di‐n‐octylfluorenyl‐2,7‐diyl) (PFO), the effect of electron trapping can be nearly eliminated. As a result, the transport in the PSF‐TAD:PFO blend becomes electron dominated. Due to the higher electron mobility, PLEDs made from these blends exhibit higher current and light‐output as compared to hole‐dominated PLEDs made from pristine PSF‐TAD. The reduced amount of electron traps enhances their efficiency from 2 cd A−1 for the hole‐dominated PLED to 5.3 cd A−1 for the electron‐dominated blend PLED.

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“…Such an efficiency roll-off for PLEDs is typically characteristic for quenching of excitons at the anode. 20 We speculate that the better electron injection for Ba/Al as observed in Fig. 4(b) might still lead to an excess of electrons at the MEH-PPV/F8BT interface, such that more electrons can escape the recombination region.…”

Section: -3mentioning

confidence: 88%

Efficient polymer light-emitting diode with air-stable aluminum cathode

Abbaszadeh

Wetzelaer

Doumon

et al. 2016

Journal of Applied Physics

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The fast degradation of polymer light-emitting diodes (PLEDs) in ambient conditions is primarily due to the oxidation of highly reactive metals, such as barium or calcium, which are used as cathode materials. Here, we report the fabrication of PLEDs using an air-stable partially oxidized aluminum (AlO x) cathode. Usually, the high work function of aluminum (4.2 eV) imposes a high barrier for injecting electrons into the lowest unoccupied molecular orbital (LUMO) of the emissive polymer (2.9 eV below the vacuum level). By partially oxidizing aluminum, its work function is decreased, but not sufficiently low for efficient electron injection. Efficient injection is obtained by inserting an electron transport layer of poly[(9,9-din -octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT), which has its LUMO at 3.3 eV below vacuum, between the AlO x cathode and the emissive polymer. The intermediate F8BT layer not only serves as a hole-blocking layer but also provides an energetic staircase for electron injection from AlO x into the emissive layer. PLEDs with an AlO x cathode and F8BT interlayer exhibit a doubling of the efficiency as compared to conventional Ba/Al PLEDs, and still operate even after being kept in ambient atmosphere for one month without encapsulation.

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Exciton quenching at PEDOT:PSS anode in polymer blue-light-emitting diodes

Cited by 20 publications

References 23 publications

State of the Art and Prospects for Halide Perovskite Nanocrystals

State of the Art and Prospects for Halide Perovskite Nanocrystals

Efficient Blue Polymer Light‐Emitting Diodes with Electron‐Dominated Transport Due to Trap Dilution

Efficient polymer light-emitting diode with air-stable aluminum cathode

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