Recent Advances in Solid‐State White Light‐Emitting Electrochemical Cells

Su, Hai‐Ching; Cheng, Chia Yu

doi:10.1002/ijch.201400043

Cited by 61 publications

(42 citation statements)

References 72 publications

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“…However, although the electrical tolerance of LECs to the active-layer thickness has been well established through, e.g., the successful operation of mm-wide planar devices at a few volts drive voltage 22 , 23 , the corresponding optical dependence is less studied and comparatively poorly understood 24 , 25 . It has been demonstrated that losses due to doping-induced self-absorption become increasingly prominent as the active-layer thickness increases 26 , 27 , while an enhanced emission color or efficiency has been attributed to scattering 28 , 29 , microcavity 30 , 31 , and waveguide-coupling effects 32 .…”

Section: Introductionmentioning

confidence: 99%

The Weak Microcavity as an Enabler for Bright and Fault-tolerant Light-emitting Electrochemical Cells

Lindh

Lundberg

Lanz

et al. 2018

Sci Rep

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The light-emitting electrochemical cell (LEC) is functional at substantial active-layer thickness, and is as such heralded for being fit for low-cost and fault-tolerant solution-based fabrication. We report here that this statement should be moderated, and that in order to obtain a strong luminous output, it is fundamentally important to fabricate LEC devices with a designed thickness of the active layer. By systematic experimentation and simulation, we demonstrate that weak optical microcavity effects are prominent in a common LEC system, and that the luminance and efficiency, as well as the emission color and the angular intensity, vary in a periodic manner with the active-layer thickness. Importantly, we demonstrate that high-performance light-emission can be attained from LEC devices with a significant active-layer thickness of 300 nm, which implies that low-cost solution-processed LECs are indeed a realistic option, provided that the device structure has been appropriately designed from an optical perspective.

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Section: Introductionmentioning

confidence: 99%

The Weak Microcavity as an Enabler for Bright and Fault-tolerant Light-emitting Electrochemical Cells

Lindh

Lundberg

Lanz

et al. 2018

Sci Rep

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“…Light emission from electronic devices can be achieved using a number of physical processes, resulting in a variety of device architectures, all of which have in common that they require a complex stack of various functional materials, some of which need to be deposited as a continuous homogeneous film, whereas others must be structured. The working principles of light emitting electrochemical cells (LECs), electroluminescent devices using alternating voltage (AC‐EL), and organic light emitting diodes (OLEDs), have been described in detail and therefore will not be explained here again. All these devices need some type of transparent electrode structure and highly conductive wiring, which has been discussed already in the two sections above.…”

Section: Light Emitting Devicesmentioning

confidence: 99%

Roll‐to‐Roll Fabrication of Solution Processed Electronics

Abbel¹,

2018

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The production of electronic devices using solution based ("wet") deposition technologies has some decisive technical and commercial advantages compared to competing approaches like vacuum based ("dry") manufacturing. Particularly, the potential to scale up production processes to large areas and high volumes by introducing continuous roll-to-roll (R2R) methods on flexible substrates has been the topic of intense studies from both applied research institutes and industry already for some years. Decisive steps forward have been achieved during that time, resulting in the dawn of commercial applications for a number of processes, while additional development work is still needed in some other fields. This review summarizes the work published during the last few years on the R2R printing and wet coating of electronic devices. An overview is presented of the basic operational principles for the most commonly used R2R printing and coating methods and techniques for proper web handling in R2R lines. Then, the most commonly used types of flexible substrate materials are introduced, followed by a review of the work published in the application areas of transparent conductor materials, printed electric connections, light emitting devices, photovoltaic energy generation, printed logic, and sensing.

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“…Before turning our attention to the more specific recent progress in the LEC field, we wish to acknowledge and direct the reader's attention to previous important summaries and reviews on LEC research, as provided by Refs. [22][23][24][25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Light-Emitting Electrochemical Cells: A Review on Recent Progress

2016

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The light-emitting electrochemical cell (LEC) is an area-emitting device, which features a complex turn-on process that ends with the formation of a p-n junction doping structure within the active material. This in-situ doping transformation is attractive in that it promises to pave the way for an unprecedented low-cost fabrication of thin and light-weight devices that present efficient light emission at low applied voltage. In this review, we present recent insights regarding the operational mechanism, breakthroughs in the development of scalable and adaptable solution-based methods for cost-efficient fabrication, and successful efforts toward the realization of LEC devices with improved efficiency and stability.

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Recent Advances in Solid‐State White Light‐Emitting Electrochemical Cells

Cited by 61 publications

References 72 publications

The Weak Microcavity as an Enabler for Bright and Fault-tolerant Light-emitting Electrochemical Cells

The Weak Microcavity as an Enabler for Bright and Fault-tolerant Light-emitting Electrochemical Cells

Roll‐to‐Roll Fabrication of Solution Processed Electronics

Light-Emitting Electrochemical Cells: A Review on Recent Progress

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