Reflective–emissive photoluminescent cholesteric liquid crystal display

Kim, Jang-Kyum; Joo, Suk-Hwan; Song, Jang‐Kun

doi:10.1364/ao.52.008280

Cited by 20 publications

(5 citation statements)

References 23 publications

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“…If the refl ective wavelength λ is in the visible light range, colored light will be selectively refl ected. The applications of the unique optical properties of the N*LC helical structure have been explored in diverse techniques, [ 6 ] such as polarizerfree refl ective displays, [ 7,8 ] polarizers, [ 9 ] refl ectors, [ 10 ] and optical sensors. [ 11 ] Conventional refl ective LCDs fabricated with N*LCs usually employ an external light source to provide outdoor images with vivid colors.…”

Section: Circularly Polarized Luminescence and A Refl Ective Photolummentioning

confidence: 99%

Circularly Polarized Luminescence and a Reflective Photoluminescent Chiral Nematic Liquid Crystal Display Based on an Aggregation‐Induced Emission Luminogen

Zhao

et al. 2016

Advanced Optical Materials

145

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Section: Circularly Polarized Luminescence and A Refl Ective Photolummentioning

confidence: 99%

Circularly Polarized Luminescence and a Reflective Photoluminescent Chiral Nematic Liquid Crystal Display Based on an Aggregation‐Induced Emission Luminogen

Zhao

et al. 2016

Advanced Optical Materials

145

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“…On the other hand, reflective cholesteric LC display devices do not emit light and therefore the images are insufficiently bright at night (dark condition), indoors, or in shade. To overcome this inherent limitation, luminescent cholesteric LC displays have been developed employing different approaches including incorporating fluorescent moiety into chiral dopants and dissolving fluorescence dye or luminescent nanoparticles into cholesteric LCs . However, the luminescent cholesteric LC displays reported to date operate in electrically addressed mode.…”

mentioning

confidence: 99%

Optically Rewritable Transparent Liquid Crystal Displays Enabled by Light‐Driven Chiral Fluorescent Molecular Switches

et al. 2019

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achiral nematic host materials. [4] Recently, light-driven chiral molecular switches have been the materials of choice in the fabrication of cholesteric materials due to the fact that such systems provide unique opportunity to take advantage of the special characteristics of light, i.e., remote wireless controllability with high spatial and temporal resolution. [5,6] Accordingly, a variety of light-driven chiral molecular switches have been designed and synthesized that have enabled the development of cholesteric LCs in many applications including wavelength and chirality tunable color reflectors, [7,8] sensors, [9] photodisplays, [10,11] and beam steering. [12] To broaden the scope of the light-driven chiral molecular switches and to develop multifunctional cholesteric LCs for sophisticated and unconventional device applications, we have now turned towards the design and synthesis of photodynamic luminescent chiral molecular switches with photoluminescence capability. In this endeavor, we have chosen α-cyanostilbene scaffold as the functional photoresponsive moiety in the chiral molecular switches since it is well known to exhibit tunable photoluminescence upon lightdriven isomerization. Here we report on the design, synthesis, and the use of new ɑ-cyanostilbene based chiral fluorescent molecular switches capable of exhibiting reversible photoisomerization without thermal relaxation in the development of multifunctional cholesteric LCs and fabrication of monoand dual-mode transparent display devices. It should be noted that the recently reported cyanostilbene based chiral molecular switches were not able to show reversible photoisomerization behavior [9,11] and hence cannot be employed in the fabrication of highly desirable optically rewritable transparent display devices based on cholesteric LCs. Since the cyanostilbene unit provides necessary handles to tune both the helical twisting power (HTP) and fluorescence intensity, we have harnessed this unique combination of promising characteristics to demonstrate high performance optically rewritable transparent cholesteric devices operating in different modes and capable of displaying information in bright and dark ambient conditions. Furthermore, the feasibility of a "remote-writing board" is disclosed in this study.It is well known that images in cholesteric LC displays are vivid even in full bright sunlight without the aid of a polarizer or color filter. [13] Especially, cholesteric LCs can be employed Functional soft materials exhibiting distinct functionalities in response to a specific stimulus are highly desirable towards the fabrication of advanced devices with superior dynamic performances. Herein, two novel light-driven chiral fluorescent molecular switches have been designed and synthesized that are able to exhibit unprecedented reversible Z/E photoisomerization behavior along with tunable fluorescence intensity in both isotropic and anisotropic media. Cholesteric liquid crystals fabricated using these new fluorescent molecular switches as chiral dopan...

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“…The data in Fig. 2(b) are obtained by scaling the absorption coefficients in the literature 11 , 12 based on the transmittances of these layers measured at 450 nm 8 . We purchased an IRpf and measured its spectral transmittance.…”

Section: One-dimensional Modelmentioning

confidence: 99%

Front lighting for an energy-harvesting luminous-reflective display and its design considerations

2022

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The color gamut of a luminous-reflective display (LRD) shrinks when the incident light lacks blue photons. A frontlight unit (FLU) emitting in blue can prevent this and ensure readability in the dark. A one-dimensional model was developed to express spectral fluxes emerging from the subpixels in an energy-harvesting LRD (EH-LRD) in terms of its design parameters and the ambient lighting condition. In the experiment, a luminescent layer stacked on an infrared pass filter was excited by monochromatic light from an edge-lit FLU at 405 nm in the dark. The model roughly reproduced the relative peak intensities measured with the three materials (BBOT, Coumarin 6, and Lumogen F Red 305). It quantifies the trade-off between the two objectives of an EH-LRD: displaying images and harvesting energy. Hence, the model might be used to set goals for future developments of materials and components. © The Authors.Published by SPIE under a Creative Commons Attribution 4.0 International 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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Reflective–emissive photoluminescent cholesteric liquid crystal display

Cited by 20 publications

References 23 publications

Circularly Polarized Luminescence and a Reflective Photoluminescent Chiral Nematic Liquid Crystal Display Based on an Aggregation‐Induced Emission Luminogen

Circularly Polarized Luminescence and a Reflective Photoluminescent Chiral Nematic Liquid Crystal Display Based on an Aggregation‐Induced Emission Luminogen

Optically Rewritable Transparent Liquid Crystal Displays Enabled by Light‐Driven Chiral Fluorescent Molecular Switches

Front lighting for an energy-harvesting luminous-reflective display and its design considerations

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