Modeling and Characterization of Organic Light-Emitting Diodes Including Capacitance Effect

Bender, Vitor C.; Barth, Norton D.; Mendes, Fernanda B.; Pinto, Rafael A.; Alonso, J.M.; Marchesan, Tiago Bandeira

doi:10.1109/ted.2015.2467314

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…Other resistances not accounted for in the simulated pixels, will also be present in the measured OLED pixels. [31] Similar trends were also recorded in smaller pixels ( Figure S3c, Supporting Information).…”

Section: Oled Performance Enhancement With Metal Gridssupporting

confidence: 77%

Metal Grid Structures for Enhancing the Stability and Performance of Solution‐Processed Organic Light‐Emitting Diodes

Burwell

Burridge

Sandberg

et al. 2020

Adv Elect Materials

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Solution-processed and low-temperature evaporated OLEDs are amenable to highvolume production methods that are compatible with thin, conformal, and flexible substrates, such as roll-to-roll processing or printing. [4] As issues related to scaling pixel sizes are addressed, [5] OLEDs could become a technology choice for diffuse, low luminance, large area lighting panels that are thin and lightweight. [6] As increasingly efficient OLED materials are developed and their production is scaled using methods with low embodied energy, OLED lighting panels may help to reduce worldwide energy consumption for lighting using sustainable materials. [7] Despite the great success of OLEDs in the display technology market, for lighting applications OLEDs have not to date been widely adopted. Several factors have played a role in this regard, a central one being the requirement for relatively high electrical drive currents in large area OLEDs limited by the relatively high sheet resistance (≈10-20 Ω □ −1) of the transparent conductive electrodes (TCEs). Additionally, for large-area printed OLEDs intended for lighting applications, standard "lab-scale" deposition methods such as spin-coating are not appropriate, and one must turn instead to printing methodologies. Furthermore, since point defect densities scale exponentially with area in thin solution-processed layers (typically efficient OLEDs have emissive layer thicknesses of ≈100 nm), high production yields over large areas naturally require much thicker devices with non-optimal performance characteristics. [8] Minimizing defects also requires a low surface roughness (indeed flat) deposition substrate, and this is where the quality of the TCE also plays a role since in a conventional architecture it is the support electrode. The required electrical and optical properties of TCEs impose additional constraints on the choice of available materials. In practical terms average visible transmittances >80% (with flat spectral responses) and resistivities <10 −3 Ω • cm are required. [7,9,10] For state-of-the-art metal oxide TCEs such as indium tin oxide (ITO) this means a sheet resistance of order 10-20 Ω □ −1-very much on the borderline of Transparent conducting electrodes (TCEs) are key components of optoelectronic devices where input or output light coupling are central functions-for example, solar cells, light-emitting diodes, or displays. Indium tin oxide (ITO) has been the TCE of choice for over three decades, and there are few alternatives. The characteristic size of devices made with ITO is often limited to a few centimeters because of the intrinsic sheet resistance. This is an obstacle for scaling thin film photovoltaics and lighting platforms to technologicallyrelevant large areas. In this article, the use of metallic micro-grids is investigated to improve sheet resistance-visible transparency balance of TCEs, resulting in improved performance and stability of organic light-emitting diodes (OLEDs). Finite element models are used to simulate OLEDs pixels on ITO with metal gri...

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Section: Oled Performance Enhancement With Metal Gridssupporting

confidence: 77%

Metal Grid Structures for Enhancing the Stability and Performance of Solution‐Processed Organic Light‐Emitting Diodes

Burwell

Burridge

Sandberg

et al. 2020

Adv Elect Materials

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“…[220] Resistors and capacitances augment the diode element to capture non-ideal diode behavior [220,222] and to discriminate operating regimes. [213,221,223] The latter is illustrated with the network shown in Figure 17. A typical current voltage characteristic of an OLED is divided in three forward voltage regions, illustrated as colored regions in Figure 17a.…”

Section: Steady State Operation Of Oledsmentioning

confidence: 99%

“…Note that capacitances in general are not relevant in steady state, because the OLED equivalent capacitance will behave as an open circuit and has no effect on OLED voltage and current. [ 221 ]…”

Section: Approaches Inspired By Circuit‐modelingmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of Charge Carriers in Organic Electronic Devices: Methods with their Fundamentals and Applications

Zojer

2021

Advanced Optical Materials

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Device modeling is an established tool to design and optimize organic electronic devices, be them organic light emitting diodes, organic photovoltaic devices, or organic transistors and thin‐film transistors. Further, reliable device simulations form the basis for elaborate experimental characterizations of crucial mechanisms encountered in such devices. The present contribution collects and compares contemporary model approaches to describe charge transport in devices. These approaches comprise kinetic Monte Carlo, the master equation, drift‐diffusion, and equivalent circuit analysis. This overview particularly aims at highlighting the following three aspects for each method: i) The foundation of a method including inherent assumptions and capabilities, ii) how the nature of organic semiconductors enters the model, and iii) how major tuning handles required to control the device operation are accounted for, namely temperature, external field, and provision of mobile carriers. As these approaches form a hierarchy of models suitable for multiscale modeling, this contribution also points out less established or even missing links between the approaches.

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“…Some studies have investigated modelling of the carrier transport and the energy bands inside OLEDs [3,4]. Another approach is to develop equivalent circuit SPICE models [5][6][7][8]. The models are built with standard SPICE components.…”

Section: Introductionmentioning

confidence: 99%

52.1: Invited Paper: Novel dual‐branch SPICE model for tandem structure OLED

Mai

Underwood

2021

Symp Digest of Tech Papers

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Tandem‐structure OLED devices have been developed using charge generation layers to implement two or more OLED units in a single stack. They can achieve higher brightness at a given current density than the conventional OLEDs. In order to incorporate the novel tandem structure OLED within the computer aided design (CAD) flow of microdisplays, we have developed an equivalent circuit model that accurately describes the tandem OLED electrical characteristics.

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Modeling and Characterization of Organic Light-Emitting Diodes Including Capacitance Effect

Cited by 12 publications

References 25 publications

Metal Grid Structures for Enhancing the Stability and Performance of Solution‐Processed Organic Light‐Emitting Diodes

Metal Grid Structures for Enhancing the Stability and Performance of Solution‐Processed Organic Light‐Emitting Diodes

Simulation of Charge Carriers in Organic Electronic Devices: Methods with their Fundamentals and Applications

52.1: Invited Paper: Novel dual‐branch SPICE model for tandem structure OLED

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