Triangular-shaped zinc oxide nanoparticles enhance the device performances of inverted OLEDs

Mucur, Selin Pıravadılı; Tumay, Tülay Aslı; Birdoğan, S.; San, Sait Eren; Tekin, Emine

doi:10.1016/j.nanoso.2015.01.001

Cited by 20 publications

(11 citation statements)

References 65 publications

(66 reference statements)

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“…The origin of the improved electron injection by ZnO nanoparticles is yet not completely clear and is often attributed to a reduced energy mismatch (reduced energy barrier) between emitter and Al cathode due to low values of the ZnO work function and the CB . Other possibilities suggested in literature for organic emitters are the formation of surface dipoles at the ZnO/emitter interface due to the buildup of holes in the light‐emitting layer close to this interface or Auger‐assisted electron injection due to the small size of ZnO nanoparticles . However, further experiments are needed to clarify the origin of the improved electron injection in our system.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…Apparently, there is not enough time for the amorphous PLA chain to adjust well on increasing the heating rate. 36…”

Section: Resultsmentioning

confidence: 99%

“…The use of PLA as an organic support 34,32 in the construction of biodegradable LEDs has not been reported previously, to our knowledge, and is a development which we now wish to disclose in this paper. 35,36 Pyrene and perylene are highly emissive chromophores, their light emission being in the deep blue-UV (377-420 nm) and blue (450 nm) regions of the electromagnetic spectrum respectively. Both pyrene and perylene are planar, polycyclic aromatic hydrocarbons which demonstrate a tendency for self-aggregation in both the solid and solution state.…”

Section: Introductionmentioning

confidence: 99%

Polylactide‐perylene derivative for blue biodegradable organic light‐emitting diodes

Al-Attar

Alwattar

Haddad

et al. 2020

Polymer International

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In this work we demonstrate, for the first time, the use of polylactic acid (PLA) as a biodegradable host matrix for the construction of the active emissive layer of organic light-emitting diode (OLED) devices for potential use in bioelectronics. In this preliminary study, we report a robust synthesis of two fluorescent PLA derivatives, pyrene-PLA (AH10) and perylene-PLA (AH11). These materials were prepared by the ring opening polymerisation of L-lactide with hydroxyalkyl-pyrene and hydroxyalkyl-perylene derivatives using 1,8-diazabicyclo[5.4.0]undec-7-ene as catalyst. OLEDs were fabricated from these materials using a simple device architecture involving a solution-processed single-emitting layer in the configuration ITO/PEDOT:PSS/PVK:OXD-7 (35%):AH10 or AH11 (20%)/TPBi/LiF/Al (ITO, indium tin oxide; PEDOT:PSS, poly(3,4-ethylenedioxythiophene) doped with poly (styrenesulfonic acid); PVK, poly(vinylcarbazole); OXD-7, (1,3-phenylene)-bis-[5-(4-tert-butylphenyl)-1,3,4-oxadiazole]; TPBi, 2,2 0 ,2 00-(1,3,5-benzenetriyl)tris(1-phenyl-1H-benzimidazole)). The turn-on voltage for the perylene OLED at 10 cd m-2 was around 6 V with a maximum brightness of 1200 cd m-2 at 13 V. The corresponding external quantum efficiency and device current efficiency were 1.5% and 2.8 cd A-1 respectively. In summary, this study provides proof of principle that OLEDs can be constructed from PLA, a readily available and renewable bio-source.

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“…Recently, the application of nanoparticles (NPs) has been a prevailing research topic in order to enhance the performances of polymer OLEDs [5][6][7][8][9]. Due to their small dimensions (< 100 nm), nanostructures have high surface/volume ratio and high surface energy compared to bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Annealing effect of gold thin films on the light output performances of organic light emitting diodes

Mucur¹,

Tekin²

2018

Turk J Phys

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Gold thin films (GTFs) are transferred onto a nanostructured surface and their effects on the characteristics of organic light emitting diodes (OLED) are investigated. GTF deposition is realized by the physical vapor deposition technique under high vacuum. Globose gold nanostructures are successfully generated by annealing GTFs at different temperatures. Atomic force microscopy reveals morphological changes affected by film thicknesses and annealing temperatures. In the tailored device architecture, GTFs, [poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene are used as a hole injection layer, a hole transport layer, and an emissive layer, respectively. The performances of the fabricated OLEDs are enhanced in the presence of gold nanostructures obtained by thermal annealing GTFs coated onto the anode electrode of the devices. GTF thickness of 4.0 nm and an annealing temperature of 500 • C yield a nearly 2.6 times increase in the light output of the OLEDs.

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Triangular-shaped zinc oxide nanoparticles enhance the device performances of inverted OLEDs

Cited by 20 publications

References 65 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)

Polylactide‐perylene derivative for blue biodegradable organic light‐emitting diodes

Annealing effect of gold thin films on the light output performances of organic light emitting diodes

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