Ultrasonic spray coating as deposition technique for the light-emitting layer in polymer LEDs

Gilissen, Koen; Stryckers, Jeroen; Verstappen, Pieter; Drijkoningen, Jeroen; Heintges, Gaël H. L.; Lutsen, Laurence; Manca, Jean; Maes, Wouter; Deferme, Wim

doi:10.1016/j.orgel.2015.01.015

Cited by 40 publications

(27 citation statements)

References 22 publications

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“…The commercially-available polymer Merck Super Yellow, part of the PPV group of conjugated polymers and illustrated in Figure 1, has previously been shown to have a high PLQY [13]. The chemical properties of this material has been characterised in other work for applications as polymer LEDs (PLEDs) [14], and displays high sensitivity to nitroaromatic vapours with 2,4-DNT giving a significant quenching effect [12].…”

Section: Introductionmentioning

confidence: 99%

A low-cost, portable optical explosive-vapour sensor

Gillanders

Samuel

Turnbull

2017

Sensors and Actuators B: Chemical

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Highlights Arduino-based optical instrument for explosives detection designed and prototyped  Few-ppb detection of 2,4-DNT achieved under laboratory conditions with simple photodiode circuitry and off-the-shelf microprocessor  Simulated buried landmines successfully detected Abstract Humanitarian demining requires a broad range of methodologies and instrumentation for reliable identification of landmines, antipersonnel mines, and other explosive remnants of war (ERWs). Optical sensing methods are ideal for this purpose due to advantages in sensitivity, time-of-response and small form factor. In this work we present a portable photoluminescence-based sensor for nitroaromatic vapours based on the conjugated polymer Super Yellow integrated into an instrument 2 comprising an excitation LED, photodiode, Arduino microprocessor and pumping mechanics for vapour delivery. The instrument was shown to be sensitive to few-ppb concentrations of explosive vapours under laboratory conditions, and responds to simulated buried landmine vapour. The results indicate that a lightweight, easy-to-operate, low-cost and highly-sensitive optical sensor can be readily constructed for landmine and ERW detection in the field, with potential to aid worldwide efforts in landmine mitigation.

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Section: Introductionmentioning

confidence: 99%

A low-cost, portable optical explosive-vapour sensor

Gillanders

Samuel

Turnbull

2017

Sensors and Actuators B: Chemical

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“…However, the effect of thermal annealing Super Yellow thin films during OLED fabrication has not been systematically documented. As such, research reports in organic light emitting devices using polymer Super Yellow as emissive layer show a wide range of thermal treatment, from non-annealed films to annealing at temperatures up to 200 °C1821222324. A brief summary of different annealing temperatures is listed in Table S1 (Supplementary Information).…”

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confidence: 99%

Effect of thermal annealing Super Yellow emissive layer on efficiency of OLEDs

Burns

MacLeod

Trang

et al. 2017

Sci Rep

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Thermal annealing of the emissive layer of an organic light emitting diode (OLED) is a common practice for solution processable emissive layers and reported annealing temperatures varies across a wide range of temperatures. We have investigated the influence of thermal annealing of the emissive layer at different temperatures on the performance of OLEDs. Solution processed polymer Super Yellow emissive layers were annealed at different temperatures and their performances were compared against OLEDs with a non-annealed emissive layer. We found a significant difference in the efficiency of OLEDs with different annealing temperatures. The external quantum efficiency (EQE) reached a maximum of 4.09% with the emissive layer annealed at 50 °C. The EQE dropped by ~35% (to 2.72%) for OLEDs with the emissive layers annealed at 200 °C. The observed performances of OLEDs were found to be closely related to thermal properties of polymer Super Yellow. The results reported here provide an important guideline for processing emissive layers and are significant for OLED and other organic electronics research communities.

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“…It is possible to apply a variety of particle mixtures to a wide range of substrates and it allows to engineer the thin film depositions by manipulating the tuneable spray coating parameters. Spray coating is already established in many coating industries and currently researched for various emerging applications in nanotechnology including, organic and hybrid (perovskite) solar cells, OLEDs , electrodes (polymer ; metal nanoparticle ; carbon nanotubes ), etc.…”

Section: Introductionmentioning

confidence: 99%

Layer formation and morphology of ultrasonic spray coated polystyrene nanoparticle layers

Stryckers

D’Olieslaeger

Silvano

et al. 2016

Physica Status Solidi (a)

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Nanoparticles have been increasingly studied due to their unique properties. The deposition of uniform layers with these nanoparticles however is a crucial step in many of their applications. In this work, ultrasonic spray coating is the technique of choice as it is by design well-suited for the deposition of nano-suspension dispersions. The influence of different deposition parameters, ink composition and post-treatment are subject of study in this paper. It is shown in this work that (mass-) production of uniform nanoparticle layers is possible due to the narrow distribution of the droplet size and the deagglomeration of the particles during ultrasonic spray coating. It is also demonstrated that with ultrasonic spray coating it is possible to deposit an eco-friendly, water-based nanoparticle ink into layers with desired thickness and morphology.

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Ultrasonic spray coating as deposition technique for the light-emitting layer in polymer LEDs

Cited by 40 publications

References 22 publications

A low-cost, portable optical explosive-vapour sensor

A low-cost, portable optical explosive-vapour sensor

Effect of thermal annealing Super Yellow emissive layer on efficiency of OLEDs

Layer formation and morphology of ultrasonic spray coated polystyrene nanoparticle layers

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