Simultaneously enhanced device efficiency, stabilized chromaticity of organic light emitting diodes with lambertian emission characteristic by random convex lenses

Lee, Keunsoo; Lee, Jonghee; Kim, Eunhye; Lee, Jeong Ik; Cho, Doo Hee; Lim, Jong Tae; Joo, Chul Woong; Kim, Joo Yeon; Yoo, Seunghyup; Ju, Byeong Kwon; Moon, Jaehyun

doi:10.1088/0957-4484/27/7/075202

Cited by 13 publications

(3 citation statements)

References 34 publications

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“…Lastly, we note that the numerical framework developed in this study can be extended to other optical applications. For example, disordered microlens arrays based on self-assemblies have been recently proposed for light extraction in organic light-emitting diodes [39][40][41]. Herein, our methodology could be used to determine the influence of structural disorder on their light outcoupling efficiency as well as on their emission pattern.…”

Section: Discussionmentioning

confidence: 99%

Assessing the influence of structural disorder on the plant epidermal cells’ optical properties: a numerical analysis

et al. 2017

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Many plant surfaces, such as rose petals, display lens-like epidermal cells that are known to assist the collection and focusing of the sunlight. Those cells form an array with a high degree of structural irregularities including disorder in the height and orientation of the cells, and in their arrangement. In this study, we numerically analyze the influence of structural disorder on the optical properties of a 3D modeled epidermal cell array using ray tracing simulations. We conclude that the anti-reflection properties of such structures are almost unperturbed by disorder effects, although the latter can notably broaden the propagation angle distribution of the collected light. Those results also have a direct implication on the design of plant-inspired light management structures. This aspect is illustrated by introducing the example of a thin-film solar cell covered by a light harvesting epidermal cells replica and simulated for each of the three disorder types considered.

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Section: Discussionmentioning

confidence: 99%

Assessing the influence of structural disorder on the plant epidermal cells’ optical properties: a numerical analysis

et al. 2017

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“…Optical diffusers are key elements in various applications as diverse as illumination, [1][2][3] imaging, [4][5][6][7] screens, [8] microscopy, [9][10][11][12][13] colorants, [14][15][16] spectroscopy, [17][18][19] photovoltaics, [20][21][22] or wavefront shaping. [23][24][25] Their main use is to spread light across a large solid angle, thereby minimizing or ideally removing glares or high-intensity bright spots.…”

Section: Introductionmentioning

confidence: 99%

Toward Perfect Optical Diffusers: Dielectric Huygens’ Metasurfaces with Critical Positional Disorder

et al. 2021

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Conventional optical diffusers, such as thick volume scatterers (Rayleigh scattering) or microstructured surface scatterers (geometric scattering), lack the potential for on‐chip integration and are thus incompatible with next‐generation photonic devices. Dielectric Huygens’ metasurfaces, on the other hand, consist of 2D arrangements of resonant dielectric nanoparticles and therefore constitute a promising material platform for ultrathin and highly efficient photonic devices. When the nanoparticles are arranged in a random but statistically specific fashion, diffusers with exceptional properties are expected to come within reach. This work explores how dielectric Huygens’ metasurfaces can implement wavelength‐selective diffusers with negligible absorption losses and nearly Lambertian scattering profiles that are largely independent of the angle and polarization of incident waves. The combination of tailored positional disorder with a carefully balanced electric and magnetic response of the nanoparticles is shown to be an integral requirement for the operation as a diffuser. The proposed metasurfaces’ directional scattering performance is characterized both experimentally and numerically, and their usability in wavefront‐shaping applications is highlighted. Since the metasurfaces operate on the principles of Mie scattering and are embedded in a glassy environment, they may easily be incorporated in integrated photonic devices, fiber optics, or mechanically robust augmented reality displays.

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“…31 In addition to the periodical array of identical microlenses, disordered configurations (in both the position and size distribution of the lenses) have been recently proposed. For example, such ensembles were obtained spontaneously using a phase separation technique, 32 or almost autonomously via the so-called "microbial approach." 33 Their integrated η ext enhancement could not overcome that obtained with regular MLA, but adding disorder enabled improving the uniformity of the luminance angular distribution while suppressing spectral distortion.…”

Section: Improvement Of the External Outcoupling Through The Introducmentioning

confidence: 99%

Photon management in solution-processed organic light-emitting diodes: a review of light outcoupling micro- and nanostructures

et al. 2016

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To allow a greater acceptance in the display and lighting markets, organic lightemitting diode (OLED) technology is currently the subject of intensive research efforts aimed at manufacturing cost-effective devices with higher efficiencies. In this regard, strategies matured in the field of photonics and nanophotonics can be applied for photon management purposes to improve the outcoupling of the generated light and to control the emission pattern. In this review, we report on the recent experimental and numerical advances to pursue those goals by highlighting the example of bottom-emitting devices. The cases of periodical microand nanostructures, as well as of stochastic ensembles that can be easily implemented using printing techniques, are covered herein. It is shown that beyond the sole optical properties, such additional elements can simultaneously improve the electrical characteristics of solutionprocessed OLEDs, and thus enable an optimization of the devices at different levels. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Simultaneously enhanced device efficiency, stabilized chromaticity of organic light emitting diodes with lambertian emission characteristic by random convex lenses

Cited by 13 publications

References 34 publications

Assessing the influence of structural disorder on the plant epidermal cells’ optical properties: a numerical analysis

Assessing the influence of structural disorder on the plant epidermal cells’ optical properties: a numerical analysis

Toward Perfect Optical Diffusers: Dielectric Huygens’ Metasurfaces with Critical Positional Disorder

Photon management in solution-processed organic light-emitting diodes: a review of light outcoupling micro- and nanostructures

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