Electroswitchable optical device enabling both luminescence and coloration control consisted of fluoran dye and 1,4-benzoquinone

Kanazawa, Kenji; Nakamura, Kazuki; Kobayashi, Norihisa

doi:10.1016/j.solmat.2015.06.061

Cited by 37 publications

(18 citation statements)

References 81 publications

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“…First one is the redox reaction by Lewis acid base (electron transfer with anode) and other is the redox reaction by Brønsted–Lowry acid base (proton transfer with proton donor). All the reported papers for ECDs based on fluoran dye used the first method for electrochromic reaction . The second method is utilized in thermochromic system.…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

Kim

et al. 2018

Advanced Optical Materials

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In this paper, a high‐performance electrochromic optical shutter (ECOS) based on fluoran dye and an augmented reality (AR) display system comprising of ECOS are proposed. The electrochromic reactions of the fluoran dye that transmit or absorb visible light depending on its redox state are activated by the protons generated from hydroquinone derivatives, thereby significantly improved visible light absorption and decreased driving voltage. The visible light‐absorbing function of ECOS is a sole solution for overcoming the main issue of low visibility of displayed images under strong ambient light conditions in optical see‐through head‐mounted displays (OST‐HMDs) implementing augmented reality. The proposed AR display effectively solves the problem by significantly increasing the ambient contrast ratio and color gamut of the displayed image on OST‐HMD even in the strong ambient light condition due to the excellent visible light‐absorbing function of ECOS.

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Section: Resultsmentioning

confidence: 99%

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

Kim

et al. 2018

Advanced Optical Materials

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“…The reaction was carried out at 100°C under stirring (700 rpm) for 24 h. The sample was then placed in a 50°C oven for 48 h to evaporate the solvent. 1 Polyketone Modification. The functionalization of PK50 with ABA (see Figure 2) was carried out at different 1,4dicarbonyl/primary amine molar ratios (see Table 1).…”

Section: Methodsmentioning

confidence: 99%

Totally Organic Redox-Active pH-Sensitive Nanoparticles Stabilized by Amphiphilic Aromatic Polyketones

et al. 2018

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Amphiphilic aromatic polymers have been synthesized by grafting aliphatic polyketones with 4-(aminomethyl)benzoic acid at different molar ratios via the Paal-Knorr reaction. The resulting polymers, showing diketone conversion degree of 16%, 37%, 53%, and 69%, have been complexed with the redox-active 2,3,5-triphenyl-2H-tetrazolium chloride, a precursor molecule with which aromatic-aromatic interactions are held. Upon addition of ascorbic acid to the complexes, in situ reduction of the tetrazolium salt produced 1,3,5-triphenylformazan nanoparticles stabilized by the amphiphilic polymers. The stabilized nanoparticles display highly negative zeta potential [-(35-70) mV] and hydrodynamic diameters in the submicron range (100-400 nm). Nonaromatic polyelectrolytes or hydrophilic aromatic copolymers showing low linear aromatic density and high linear charge density such as acrylate/maleate and sulfonate/maleate-containing polymers were unable to stabilize formazan nanoparticles synthesized by the same method. The copolymers studied here bear uncharged nonaromatic comonomers (unreacted diketone units) as well as charged aromatic comonomers, which furnish amphiphilia. Thus, the linear aromatic density and the maximum linear charge density have the same value for each copolymer, and the hydrophilic/hydrophobic balance varies with the diketone conversion degree. The amphiphilia of the copolymers allows the stabilization of the nanoparticles, even with the copolymers showing a low linear aromatic density. The method of nanoparticle synthesis constitutes a simple, cheap, and green method for the production of switchable totally organic, redox-active, pH-sensitive nanoparticles that can be reversibly turned into macroprecipitates upon pH changing.

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“…In this case, therefore, the electroswitching from a nonfluorescent to a fluorescent species occurs because there is a change in the molecular structure of the fluoran molecule. [ 60,61 ] The other example of fluorescence enhancing has been reported by our group who proposed the use of liquid crystalline thienoviologens as ISF. [ 30,62 ] In such a case, the thienoviologen dication is a highly emissive species but, on reduction to the radical cation species, an increase of the fluorescence occurs, accompanied by a shift of the emission maximum, due to a change in the supramolecular organization of the thienoviologens in the liquid crystalline phase.…”

Section: Fundamentals Of Electrofluorochromismmentioning

confidence: 99%

Overview on the Recent Progress on Electrofluorochromic Materials and Devices: A Critical Synopsis

Corrente

Beneduci

2020

Advanced Optical Materials

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case of electroluminochromism (ELC), which includes tuning of the phosphorescence. This is mainly observed in metal organic complexes based on metals with d 6 , d 8 , and d 10 configuration such as Ir III , Ru II , and Eu III that, in contrast to entirely organic systems, exhibit emission lifetimes of several seconds. [19,20] Metal complexes generally have also rich excited state properties, good redox reversibility, high emission quantum yields, thereby showing electroluminochromic response with multicolor tunable emission in a wide wavelength range. [19,20] This interesting class of ELC materials has been extensively discussed in a some very recent reviews [19,20,21] to which the reader is reminded. EFC technology is highly desirable in electro-optic applications [8-10] as well as in fluorescent imaging. [22-24] For most of the above applications, EFC materials and devices should possess ideal properties such as high contrast of optical response, rapid switching time, long-term stability,

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Electroswitchable optical device enabling both luminescence and coloration control consisted of fluoran dye and 1,4-benzoquinone

Cited by 37 publications

References 81 publications

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

Totally Organic Redox-Active pH-Sensitive Nanoparticles Stabilized by Amphiphilic Aromatic Polyketones

Overview on the Recent Progress on Electrofluorochromic Materials and Devices: A Critical Synopsis

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