Organic light emitting diodes (OLEDs) with slot-die coated functional layers

Amruth, C; Pahlevani, Majid; Welch, Gregory C.

doi:10.1039/d0ma00903b

Cited by 18 publications

(2 citation statements)

References 105 publications

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“…The virtues of plastic electronics also include their processability. They can be cast from inks using various deposition methods such as spray and sheet coating along with roll-to-roll printing [6,7]. The advantages of these processing methods is their upscaling with the potential of production-scale device fabrication.…”

Section: Introductionmentioning

confidence: 99%

Combining Electrospinning and Electrode Printing for the Fabrication of Stretchable Organic Electrochemical Transistors

Lerond

Subramanian

Skene³

et al. 2021

Front. Phys.

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Stretchable conductors and organic electrochemical transistors (OECT) were fabricated from PEDOT:Tos (poly (3,4-ethylenedioxythiophene):iron tosylate) nanofibers. The devices were prepared by a combination of electrospinning and electrode printing followed by vapor phase polymerization (VPP). The impact of both the processing time and the composition of three electrospinning mixtures on the electrospun fiber mats was evaluated by scanning electron microscopy and cyclic voltammetry. Fibrillar mats prepared from the different mixtures maintained their electrical properties and could be stretched up to 140% of their original length. Stretchable OECTs were fabricated by printing silver drain and source electrodes directly on the conductive spun fibers. The fabricated devices showed transistor behavior up to ∼50% strain.

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Section: Introductionmentioning

confidence: 99%

Combining Electrospinning and Electrode Printing for the Fabrication of Stretchable Organic Electrochemical Transistors

Lerond

Subramanian

Skene³

et al. 2021

Front. Phys.

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“…Organic light-emitting diodes (OLEDs) have been established as energy-efficient lighting and display technologies mainly because of their high brightness, wide viewing angle, lightweight properties, and high response speed. − In general, the fabrication of the sandwiched functional layers of the OLED devices can be classified into two categories, viz., solution and vacuum-processed techniques. , The vacuum-deposited fabrication of OLEDs has been established as a highly effective technique to obtain high-performing devices . However, low material utilization, high manufacturing costs, and limited deposited space often limit the advancement of vacuum-deposited techniques and increase the cost of the final products. , Therefore, the development of solution-processed OLEDs has been greatly enhanced over the past few years .…”

Section: Introductionmentioning

confidence: 99%

Pyridine-Annulated Functional Fused Indole as a Hole Transport Material for Solution-Processed OLEDs

Kumar,

Kesavan,

Kumar

et al. 2023

ACS Appl. Opt. Mater.

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The utilization of a suitable hole transport material (HTM) is considered to be an effective strategy to advance the efficiency of OLEDs. High triplet energy (E T ) HTMs reduce the exciton quenching at the hole injection layer (HIL)/emissive layer (EML) interface and lead to better device performance. In this study, a high triplet energy (∼2.92 eV) molecular material based on the pyridine-annulated fused-indole scaffold (TW-01) was synthesized and used as a hole transport material for solutionprocessed OLED fabrication. Moreover, TW-01 possesses wellmatched frontier molecular orbital energy levels (HOMO/ LUMO) with the emissive layer, which might enhance the hole transportability in the EML. Thermal studies revealed that TW-01 has very good heat tolerance properties with a high melting point. The theoretical simulations were utilized to find a relationship between the geometrical, electrochemical, and photophysical properties of the molecule. The crystal structure analysis confirmed the twisting geometry of the molecule in which the two peripheral phenyl rings have ineffective p-orbital overlapping with the central pyridine-annulated fused-indole unit. The corresponding solution-processed green phosphorescent OLED (PhOLED) achieved good device performance with an external quantum efficiency (EQE) of 15%, and a current efficiency (CE)/power efficiency (PE) of 55 cd/A/48 lm/W, respectively, at a brightness of 100 cd/m 2 . Also, TW-01 showed a maximum luminescence of ∼24 000 cd/m 2 at a low turn-on voltage of 2.5 V. The present study indicates that rationally functionalized pyridine-annulated fused indoles could be potential HTMs for solution-processed OLEDs.

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Highly Efficient and Stable Organic Light‐Emitting Diodes with Inner Passivating Hole‐Transfer Interlayers of Poly(amic acid)‐Polyimide Copolymer

et al. 2022

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Ensuring the long‐term stability of high‐performance organic light‐emitting diodes (OLEDs) has remained a great challenge due to their limited lifetime and durability. Herein, a novel functional interlayer consisting of a poly(amic acid)‐polyimide copolymer is introduced for use in OLEDs. It is shown that an OLED sample with a polyimide‐copolymer interlayer exhibits high peak brightness of nearly 96 000 cd m−2 and efficiency of ≈92 cd A−1, much higher than those (≈73 000 cd m−2 and ≈83 cd A−1) of a well‐organized reference OLED. Moreover, the growth of dark spots is strongly suppressed in the sample OLED and the device lifetime is extended considerably. Further, highly stable and uniform large‐area OLEDs are successfully produced when using the interlayer. These improvements are ascribed not only to the excellent film‐forming and hole‐transferring properties but also to the inner passivating capability of the polyimide‐copolymer interlayer. The results here suggest that the introduction of an inner passivating/encapsulating hole‐transferable polyimide‐copolymer interlayer together with conventional external encapsulation technology represents a promising breakthrough that enhances the longevity of high‐performance next‐generation OLEDs.

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Organic light emitting diodes (OLEDs) with slot-die coated functional layers

Abstract: In this review article we cover the progress towards slot-die coated organic light emitting diodes (OLEDs). We showcase how emitting layers, charge transport layers, and electrodes can be slot-die coated to deliver practical OLED devices.

Cited by 18 publications

References 105 publications

Combining Electrospinning and Electrode Printing for the Fabrication of Stretchable Organic Electrochemical Transistors

Combining Electrospinning and Electrode Printing for the Fabrication of Stretchable Organic Electrochemical Transistors

Pyridine-Annulated Functional Fused Indole as a Hole Transport Material for Solution-Processed OLEDs

Highly Efficient and Stable Organic Light‐Emitting Diodes with Inner Passivating Hole‐Transfer Interlayers of Poly(amic acid)‐Polyimide Copolymer

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