P‐127: Highly Efficient Light Extraction Technologies Applicable for Transparent OLED Lighting using a Corrugated Substrate

Masuyama, Satoshi; Seki, Takashi; Toriyama, Shigetaka; Nishimura, Suzushi

doi:10.1002/sdtp.10147

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…To realize high-heat-resistant optical elements with fine nano/micro structures for solid-state light sources, we need to develop fabrication methods for producing inorganic nano/micro structures, as opposed to organic nano/micro structures. Various fabrication methods for inorganic nano/micro structures have been proposed, including standard photolithography and etching processes [2], direct laser writing [3], glass substrate imprinting [4] and sol-gel based imprint lithography [5,6,7,8]. Photolithography and direct laser writing both suffer from low throughput in mass production.…”

Section: Introductionmentioning

confidence: 99%

56‐4: High‐Heat‐Resistant Nano/Micro‐Structured Optical Elements Fabricated by Sol‐Gel Imprinting

Takeshita

Goto

Toriyama

2019

Symp Digest of Tech Papers

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The authors present high-heat-resistant inorganic optical elements with nano/micro structures for high power applications such as high-lumen projectors. The nano/micro structures were fabricated by a high-productivity sol-gel based imprinting process. We sought to determine the optimal conditions for preparing the precursor sol for use in a sol-gel based imprinting process. As a proof of concept, we used the technology to create formbirefringent wave plates, micro lens arrays and holographic diffusers.

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Section: Introductionmentioning

confidence: 99%

56‐4: High‐Heat‐Resistant Nano/Micro‐Structured Optical Elements Fabricated by Sol‐Gel Imprinting

Takeshita

Goto

Toriyama

2019

Symp Digest of Tech Papers

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“…There has been so many application of nanomaterials, such as using Ag nanoparticles modified ITO, 12 silver nanowire (Ag NW) with organic polymer materials, nanocomposite film, 13,14 and so on. In addition, some nanoscale microstructures are also used to enhance the device's light extraction [15][16][17] efficiency.…”

Section: Introductionmentioning

confidence: 99%

The effect of transmittance and luminous efficiency with the application of cathode mesh mask in transparent organic light‐emitting devices

Liu

Zhang

2018

J Soc Info Display

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With the development of organic light‐emitting devices (OLEDs), the transparent OLED is also restricted by its efficiency and stability. Thus, in order to improve the transmittance and luminous efficiency of transparent OLED, the cathode mesh mask combined with Al:Ag alloy is adopted to prepare the cathode of transparent OLED, which would enhanced the luminance, efficiency, and transmittance of the device. With the same driving voltage, the device has the highest brightness, when the cathode thickness is 85 nm. At the voltage of 13 and 14 V, the luminance, for bottom‐emission and top‐emission, is 9501 cd/m2 and 1840 cd/m2, respectively. The entire transmittance of the device has achieved about 78% at a 480 nm wavelength.

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“…[30,32,37,38] For instance, we produced corrugated substrates for OLEDs using buckling patterns formed spontaneously on poly(dimethylsiloxane), on which was deposited a thin aluminum film. [30,32,37,38] For instance, we produced corrugated substrates for OLEDs using buckling patterns formed spontaneously on poly(dimethylsiloxane), on which was deposited a thin aluminum film.…”

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confidence: 99%

“…[37,38] Further, these corrugated substrates have been used to fabricate highly efficient PLECs for the first time. [37,38] Further, these corrugated substrates have been used to fabricate highly efficient PLECs for the first time.…”

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confidence: 99%

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Low‐Cost, Organic Light‐Emitting Electrochemical Cells with Mass‐Producible Nanoimprinted Substrates Made Using Roll‐to‐Roll Methods

Sato

Uchida

Toriyama

et al. 2017

Adv Materials Technologies

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is thus seen as having the potential to open up new markets for high efficiency lighting. However, reducing manufacturing costs is critical because most OLED lighting still costs too much for the average consumer. As Reineke points out, the only way that costs are likely to come down significantly is through the use of roll-to-roll fabrication methods. [5] Polymer LECs (PLECs) based on fluorescent conjugated poly mers (FCPs) and ion conductors are among the most promising candidates for future lighting systems. [7][8][9][10][11][12][13] PLECs have simple singlelayer structures, which can be fabricated using roll-to-roll methods, using solutions containing both FCPs and ion conductors. [14][15][16][17][18][19] When an external voltage (V a ) higher than the threshold voltage (V th = E g /e: E g is the bandgap of the FCP and e is the elementary charge) is applied between the electrodes, light is generated as a p-n or p-i-n junction is formed as a result of in situ electrochemical doping. [7][8][9][10]20] PLECs have many other advantages, e.g., they can be fabricated using air-stable electrodes and thicker active layers. [21] So in addition to having simple single-layer structures, their other advantages make PLECs particularly well suited to manufacturing by roll-to-roll methods. In addition, it has been reported that certain low-molecularweight compounds, such as pentacene, carbene, and metal complexes, can be used to enable color tuning and improve efficiency. [11,[22][23][24][25][26][27] Realizing high efficiency organic lighting will require more effective light outcoupling technologies. [28][29][30][31][32][33][34][35][36] This is because in conventional organic light-emitting devices, ≈80% of the emitted light is optically trapped between the ITO and organic layers (ITO/organic modes) and in the glass substrate (substrate modes) and lost, and only around 20% of the emitted light can typically be extracted from the devices. In OLEDs, various approaches to enhancing outcoupling have been studied. [28][29][30][31][32][33][34][35] However, there are issues of wavelength selectivity, non-Lambertian angular emission (i.e., the directional problem), and production cost with regard to application of these techniques. To address these issues, Forrest and co-workers developed highly efficient light extraction technologies using a sub anode grid. [35] We, too, have developed efficient Next-generation, power-efficient organic lighting systems, which ideally would be low-cost and mass-producible, are urgently needed because more than 20% of total electricity use goes to lighting. This study presents polymer light-emitting electrochemical cells (PLECs) made using mass-producible nanoimprinted corrugated substrates, which effectively improve light extraction efficiency. The corrugated substrates are fabricated using roll-to-roll methods, using self-assembled block copolymers on glass and film substrates (glass: 0.45 m × 0.55 m, film: 0.6 m wide). Using the glass-type corrugated substrates, two PLECs based on (poly[2-methoxy...

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P‐127: Highly Efficient Light Extraction Technologies Applicable for Transparent OLED Lighting using a Corrugated Substrate

Cited by 5 publications

References 11 publications

56‐4: High‐Heat‐Resistant Nano/Micro‐Structured Optical Elements Fabricated by Sol‐Gel Imprinting

56‐4: High‐Heat‐Resistant Nano/Micro‐Structured Optical Elements Fabricated by Sol‐Gel Imprinting

The effect of transmittance and luminous efficiency with the application of cathode mesh mask in transparent organic light‐emitting devices

Low‐Cost, Organic Light‐Emitting Electrochemical Cells with Mass‐Producible Nanoimprinted Substrates Made Using Roll‐to‐Roll Methods

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