Transparent and Flexible Thin Film Electroluminescent Devices Using HiTUS Deposition and Laser Processing Fabrication

Tsakonas, C.; Wakeham, Steve; Cranton, Wayne; Thwaites, M.J.; Boutaud, G; Farrow, Carly; Koutsogeorgis, Demosthenes C.; Ranson, Robert

doi:10.1109/jeds.2015.2497086

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…Inorganic materials such as metals, functional metals, semiconductors, oxides and ceramics can be deposited via DC/RF plasma sputtering onto flexible substrates, but it is unclear how the flexible substrate affects their quality and properties relative to the same thin films coated onto traditional solid substrates like glass or Silicon wafers. This is a growing field of research and development and very interesting studies have already been published reporting the deposition of flexible structures for energy harvesting [5], flexile ferroelectric random access memories [6], flexible electroluminescent devices [7], flexible organic ferroelectrics [8], flexible synthetic anti-ferromagnets and nano-wires [9] and flexible solar cells [10]. In this paper we describe the deposition and experimental studies of flexible polycrystalline Ni80Fe20 permalloy thin films, together with a comparison study of their magnetic properties in rigid and flexible forms.…”

Section: Introductionmentioning

confidence: 99%

Development of flexible Ni 80 Fe 20 magnetic nano-thin films

Vopson

Naylor

Saengow

et al. 2017

Physica B: Condensed Matter

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Flexible magnetic Ni 80 Fe 20 thin films with excellent adhesion, mechanical and magnetic properties have been fabricated using magnetron plasma deposition. We demonstrate that flexible Ni 80 Fe 20 thin films maintain their non-flexible magnetic properties when the films are over 60 nm thick. However, when their thickness is reduced, the flexible thin films display significant increase in their magnetic coercive field compared to identical films coated on a solid Silicon substrate. For a 15 nm flexible Ni 80 Fe 20 film coated onto 110µm Polyvinylidene fluoride polymer substrate, we achieved a remarkable 355% increase in the magnetic coercive field relative to the same film deposited onto a Si substrate. Experimental evidence, backed by micro-magnetic modelling, indicates that the increase in the coercive fields is related to the larger roughness texture of the flexible substrates. This effect essentially transforms soft Ni 80 Fe 20 permalloy thin films into medium / hard magnetic films allowing not only mechanical flexibility of the structure, but also fine tuning of their magnetic properties.

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Section: Introductionmentioning

confidence: 99%

Development of flexible Ni 80 Fe 20 magnetic nano-thin films

Vopson

Naylor

Saengow

et al. 2017

Physica B: Condensed Matter

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“…The relatively high diffuse reflectance of the dielectric and EL film severely limits the specular transparency of the bifacial devices, which appear to be rather hazy translucent (Figure S3). Please note that there are numerous reports of semitransparent ACEL devices, where the dielectric and light-emitting layers have been prepared by sputtering 29 or atomic layer deposition 30 that afford smooth layers with a high specular transmittance.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Bifacial Color-Tunable Electroluminescent Devices

Gahlmann

Tschorn²,

Maschwitz

et al. 2021

ACS Appl. Mater. Interfaces

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Alternate current electroluminescent (ACEL) devices provide a range of interesting properties, such as facile large-area processability, mechanical flexibility, and outstanding resilience, when compared with other large-area light-emitting technologies. To widen the scope of possible applications for ACEL devices, color tunability and white light emission are desirable. Here, we introduce a novel three-terminal device architecture based on two monolithically stacked ACEL devices (e.g., orange and blue) that allows for color tunability via independent operation of the subdevices. The tandem devices comprise semitransparent bottom and top electrodes based on networks of silver nanowires, which endow the tandem ACEL device with bifacial Janus-type emission. We provide a detailed analysis of the sources of optical losses in single and tandem ACEL devices. Our novel device concept enables novel facets of applications for ACEL in signage and lighting.

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“…Laser processing was undertaken in air using a KrF Lambda Physik 305i excimer laser (248 nm) and a beam delivery system providing a homogenised 13 mm × 13 mm square beam at the sample plane (hence covering the full area of the 1 cm × 1 cm Hall samples). This configuration was also used previously for laser processing of thin phosphor films for foldable displays [11] and has been demonstrated to facilitate large area processing of display substrates via a sample step and repeat process. A range of processing parameters was used by varying the fluence (48-295 mJ cm −2 ) and the number of pulses (1-6000) at a pulse frequency of 10 Hz.…”

Section: Methodsmentioning

confidence: 99%

Low temperature sputter-deposited ZnO films with enhanced Hall mobility using excimer laser post-processing

Tsakonas¹,

Кузнецов²,

Cranton³

et al. 2017

J. Phys. D: Appl. Phys.

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We report the low temperature (T<70 ºC) fabrication of ZnO thin films (~140 nm) with Hall mobility of up to 17.3 cm 2 V-1 s-1 making them suitable for thin film transistor (TFT) applications. The films were deposited by rf magnetron sputtering at T<70 ºC and subsequently laser processed in ambient temperature in order to modify the Hall mobility and carrier concentration. Medium-to-low energy laser radiation densities and a high number of pulses were used to avoid damaging the films. Laser annealing of the films after aging in the lab under 25%-35% relative humidity and at an average illuminance of 120 lux resulted in an overall higher mobility and relatively low carrier concentration in comparison to the non-aged films that were laser processed immediately after deposition. A maximum overall measured Hall mobility of 17.3 cm 2 V-1 s-1 at a carrier density of 2.3×10 18 cm-3 was measured from a 1 GΩ as deposited and aged film after the laser treatment. We suggest that the aging of non-processed films reduces structural defects mainly at grain boundaries by air species chemisorption, with concomitant increase in thermal conductivity so that laser processing can have an enhancing effect. Such a processing combination can act synergistically and produce suitable active layers for TFT applications with low temperature processing requirements.

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Transparent and Flexible Thin Film Electroluminescent Devices Using HiTUS Deposition and Laser Processing Fabrication

Cited by 4 publications

References 27 publications

Development of flexible Ni 80 Fe 20 magnetic nano-thin films

Development of flexible Ni 80 Fe 20 magnetic nano-thin films

Bifacial Color-Tunable Electroluminescent Devices

Low temperature sputter-deposited ZnO films with enhanced Hall mobility using excimer laser post-processing

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