Enhanced outcoupling in down-conversion white organic light-emitting diodes using imprinted microlens array films with breath figure patterns

Han, Joo Won; Joo, Chul Woong; Lee, Jonghee; Lee, Dong Jin; Kang, Jisoo; Yu, Seunggun; Sung, Woo Jin; Cho, Nam Sung; Kim, Yong Hyun

doi:10.1080/14686996.2018.1551040

Cited by 23 publications

(9 citation statements)

References 35 publications

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“…1d ), n typically varies between 1.0 and 3.0, subject to upconversion saturation 26 , 32 – 34 . Thus, the excitation light intensity amplification through the joint action of the superlensing and plasmonic effects can potentially lead to UCL enhancement by four orders of magnitude for the utilized UCNCs 20 . Considering the finite size of the UCNCs (45 nm) and the localization of the plasmonic field generated by the Au NRs, only part of each nanocrystal was located within the hotspots.…”

Section: Resultsmentioning

confidence: 99%

“…In the past, a few approaches have been explored to boost UCL and decrease the pumping threshold of UCNCs, e.g., nanocrystal surface passivation, photonic crystal engineering, plasmon/organic antennas, and superlensing effects 19 , 20 . Among other techniques, utilizing the localized surface plasmon resonance (LSPR) of noble-metal nanostructures and the superlensing effect of dielectric optical microstructures can serve as two efficient strategies to take advantage of the highly nonlinear response of UCNCs to excitation intensity 21 – 26 .…”

Section: Introductionmentioning

confidence: 99%

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Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Ding

et al. 2020

Light Sci Appl

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Since selective detection of multiple narrow spectral bands in the near-infrared (NIR) region still poses a fundamental challenge, we have, in this work, developed NIR photodetectors (PDs) using photon upconversion nanocrystals (UCNCs) combined with perovskite films. To conquer the relatively high pumping threshold of UCNCs, we designed a novel cascade optical field modulation strategy to boost upconversion luminescence (UCL) by cascading the superlensing effect of dielectric microlens arrays and the plasmonic effect of gold nanorods, which readily leads to a UCL enhancement by more than four orders of magnitude under weak light irradiation. By accommodating multiple optically active lanthanide ions in a core-shell-shell hierarchical architecture, developed PDs on top of this structure can detect three well-separated narrow bands in the NIR region, i.e., those centered at 808, 980, and 1540 nm. Due to the large UCL enhancement, the obtained PDs demonstrate extremely high responsivities of 30.73, 23.15, and 12.20 A W−1 and detectivities of 5.36, 3.45, and 1.91 × 1011 Jones for 808, 980, and 1540 nm light detection, respectively, together with short response times in the range of 80–120 ms. Moreover, we demonstrate for the first time that the response to the excitation modulation frequency of a PD can be employed to discriminate the incident light wavelength. We believe that our work provides novel insight for developing NIR PDs and that it can spur the development of other applications using upconversion nanotechnology.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Ding

et al. 2020

Light Sci Appl

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“…These ordered arrays have application value in tissue engineering, biochip and surface enhanced Raman scattering substrate. [ 148‐151 ]…”

Section: Application Of Bf Membranementioning

confidence: 99%

Ordered Honeycomb‐Pattern Membrane^†

Yuan

Dai

et al. 2020

Chin. J. Chem.

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Ordered porous membranes have wide and important application prospects in the fields of filtration, separation, catalysis, biomedicine, etc., and have attracted growing interest in the field of material science. Among diverse membrane preparation approaches, breath pattern method has been widely concerned due to its simplicity in the preparation, ease in tuning the structure/property and functionality of formed membranes, and broad utility for various polymers. With the development of material design, the application spectrum of breath figure membrane has been greatly expanded. However, since the pore morphology of porous membrane is influenced by many factors, the controlling mechanism of normalization has not been clear yet. In this paper, the research progress of film-forming materials in recent years is reviewed, and the correlation between pore formation and pore morphology is discussed in details. This information will provide a systematic and in-depth perspective for research in this filed and an important guideline for the preparation of the ordered porous films with divergent applications. Hua Yuan (left) is an associate professor in College of Materials Science and Engineering, Qingdao University, China. She received her doctorate from Shandong University in China in 2013. She is mainly engaged in the research of carbon fiber, composites and microfiltration membrane. Guangzhen Li (middle) is a graduate student in the College of Materials Science and Engineering, Qingdao University, China. He graduated with a bachelor's degree in engineering from Qingdao University in 2019. His current research focuses on the structural design and functionalization of membrane materials. Enhao Dai (right) is a graduate student of the College of Materials Science and Engineering of Qingdao University. He received a bachelor's degree in engineering from Yantai University in 2018. Currently, he mainly studies carbon fiber modification.

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“…In recent years, polymeric honeycomb-like films via the BF process have received lots of scientific attention, especially in pursuit of practical applications [4,5,9,10,11,12,13,14,16,63]. These applications are classified in several fields, such as templating [64,65], surface-enhanced Raman scattering (SERS) [49,66,67,68,69,70], biomedical researches [43,71], electronic devices [72,73,74,75,76,77], etc. The ordered array films could serve as the templates to transfer certain patterns for polymers which are not easy to prepare directly by the BF method.…”

Section: Applicationsmentioning

confidence: 99%

“…On the other hand, the periodic microstructures were used in some optoelectronic devices, including microlens arrays (MLAs), and micropatterned light-emitting diodes (LEDs) [73,74,77,80]. MLA prepared by the BF method would act as the key component for the signal enhancement of optoelectronic devices such as optical telecommunication, displays, and solid-state lighting.…”

Section: Applicationsmentioning

confidence: 99%

In Search of a Green Process: Polymeric Films with Ordered Arrays via a Water Droplet Technique

Yeh

Huang

et al. 2019

Polymers

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As an efficient technique for the preparation of polymeric hexagonal orderly arrays, the breath figure (BF) process has opened a modern avenue for a bottom-up fabrication method for more than two decades. Through the use of the water vapor condensation on the solution surface, the water droplets will hexagonally pack into ordered arrays, acting as a template for controlling the regular micro patterns of polymeric films. Comparing to the top-down techniques, such as lithography or chemical etching, the use of water vapor as the template provides a simple fabrication process with sustainability. However, using highly hazardous solvents such as chloroform, carbon disulfide (CS2), benzene, dichloromethane, etc., to dissolve polymers might hinder the development toward green processes based on this technique. In this review, we will touch upon the contemporary techniques of the BF process, including its up-to-date applications first. More importantly, the search of greener processes along with less hazardous solvents for the possibility of a more sustainable BF process is the focal point of this review.

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Enhanced outcoupling in down-conversion white organic light-emitting diodes using imprinted microlens array films with breath figure patterns

Cited by 23 publications

References 35 publications

Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Ordered Honeycomb‐Pattern Membrane^†

In Search of a Green Process: Polymeric Films with Ordered Arrays via a Water Droplet Technique

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Enhanced outcoupling in down-conversion white organic light-emitting diodes using imprinted microlens array films with breath figure patterns

Cited by 23 publications

References 35 publications

Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Ordered Honeycomb‐Pattern Membrane†

In Search of a Green Process: Polymeric Films with Ordered Arrays via a Water Droplet Technique

Contact Info

Product

Resources

About

Ordered Honeycomb‐Pattern Membrane^†