Broadband Antireflective Structures on PMMA by Plasma Treatment

Leitel, Robert; Kaless, Antje; Schulz, Ulrike; Kaiser, Norbert

doi:10.1002/ppap.200732103

Cited by 20 publications

(21 citation statements)

References 12 publications

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“…To realize the FHS ( Figure ), a micropatterned flexible substrate were fabricated by oxygen plasma treatment of pre‐cleaned PET. Polymer films are composed of semi‐crystalline and amorphous regimes, which etch at different rates under plasma treatment . Due to the different etching rate, micropatterns are formed on the polymer surface spontaneously .…”

Section: Resultsmentioning

confidence: 99%

Spontaneously Embedded Scattering Structures in a Flexible Substrate for Light Extraction

Gim

Lee

Park

et al. 2017

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A flexible hazy substrate (FHS) with embedded air bubbles to increase light extraction efficiency of organic light-emitting diodes (OLEDs) is reported. In order to embed the air bubbles in the flexible substrate, micropatterned substrates are fabricated by plasma treatment, and then coated with a planarization layer. During the planarization layer coating, air bubbles are trapped between the substrate and the planarization layer. The haze of the FHS can be controlled from 1.7% to 68.4% by changing the size of micropatterns by adjusting the plasma treatment time. The FHS shows average haze of 68.4%, average total transmittance of 90.3%, and extremely flat surface with average roughness (R ) of 1.2 nm. Rigorous coupled-wave analysis and finite-difference time-domain simulations are conducted to demonstrate that the air bubbles in the substrate can effectively extract photons that are trapped in the substrate. The FHS increases the power efficiency of OLEDs by 22% and further increases by 91% combined with an external extraction layer. Moreover, the FHS has excellent mechanical flexibility. No defect has been observed after 10 000 bending cycles at bending radius of 4 mm.

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Section: Resultsmentioning

confidence: 99%

Spontaneously Embedded Scattering Structures in a Flexible Substrate for Light Extraction

Gim

Lee

Park

et al. 2017

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“…g., [51][52][53][54][55][56][57][58]) that depending on the substrate material and treatment conditions (pressure, ion During the etching process, not only the morphology, but also surface chemical structure is altered. Therefore, in order to produce surfaces with the desired chemical composition, roughened surfaces are coated by thin films of plasma polymers with required properties.…”

Section: Deposition Of Plasma Polymers On Stochastically-roughened Sumentioning

confidence: 99%

Nanostructured plasma polymers

2013

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“…Early reports on motheye structures deal with periodic profiles 24 . More recent investigations have shown, that stochastic motheye structures on polymer surfaces can be prepared by a plasma etching process in high vacuum 25 .…”

Section: Motheye-structures As Low Effective-index Films For Antireflmentioning

confidence: 99%

Nanostructure effects and the performance of optical interference coatings

Stenzel

Schulz

Kaiser

2011

Nanostructured Thin Films IV

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The theory of "classical" optical interference coatings is based on assumptions like ideal homogeneity and isotropy of the materials, as well as absolutely smooth and infinitesimally thin interfaces between the individual coating materials. Within the framework of these assumptions, there exists an elaborated theoretical apparatus for solving design and characterization tasks for optical coatings. At the same time, coating deposition techniques have been perfected in order to match with the requirements of homogeneity and smoothness of these coatings in practice. Remaining discrepancies between the theoretically predicted and practically achieved coating performance can - at least partially - be attributed to the violation of the above-mentioned ideal assumptions. But a closer look on this matter reveals a more differentiated picture: Nanostructure effects can be tackled as additional degrees of freedom for coating design, and can lead to useful property combinations that are inaccessible to "classical" coatings prepared on the basis of the traditionally available coating materials. This presentation deals with practical examples, where explicit violations of the usually assumed perfect homogeneity and smoothness of the coatings have resulted in novel and innovative coating material properties or coating designs. Examples include: - Effects of noble metal islands embedded in semiconductor films: applications in photovoltaics - Antireflection effects of nanostructured surfaces: motheye-structures - Effects of nanoporosity in oxide films on refractive index, thermal shift and mechanical stress: balanced coating properties The examples demonstrate the possible benefits of the exploitation of nanostructure-caused effects in interference coating science and technology

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Broadband Antireflective Structures on PMMA by Plasma Treatment

Cited by 20 publications

References 12 publications

Spontaneously Embedded Scattering Structures in a Flexible Substrate for Light Extraction

Spontaneously Embedded Scattering Structures in a Flexible Substrate for Light Extraction

Nanostructured plasma polymers

Nanostructure effects and the performance of optical interference coatings

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