Photochromic and photomechanical responses of an amorphous diarylethene-based polymer: a spectroscopic ellipsometry investigation of ultrathin films

Toccafondi, Chiara; Occhi, Luca; Cavalleri, Ornella; Penco, Amanda; Castagna, Rossella; Bianco, Andrea; Bertarelli, Chiara; Comoretto, Davide; Canepa, M.

doi:10.1039/c4tc00371c

Cited by 25 publications

(38 citation statements)

References 77 publications

(106 reference statements)

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“…Ellipsometry was employed to determine the film thickness and the refractive index modulation vs. photo-stimulation, similarly to a recent paper on a related system [17]. Measurements were performed in a darkened room at 60 • , 65 • , and 70 • angles of incidence, using a rotating compensator instrument (M-2000, J.A.…”

Section: Spectroscopic Ellipsometrymentioning

confidence: 99%

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

et al. 2017

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Photochromic polymers have been studied as rewritable systems for optical elements with tunable transparency in the visible and refractive index in the NIR. Six diarylethene monomers have been synthesized to give thin films of photochromic polyurethanes. The absorption properties of the monomers in solution and of the corresponding polymeric films have been evaluated showing that a transparency contrast in the visible spectrum of the order of 10 3 can be obtained by a suitable choice of the chemical structure and illumination wavelength. The change in the refractive index in the NIR have been determined by ellipsometry showing changes larger than 10 −2 . A trend of this variation with the absorption properties has been also highlighted. Fresnel lenses working on the basis of both a change of the transparency and the refractive index (amplitude and phase) have been demonstrated.

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Section: Spectroscopic Ellipsometrymentioning

confidence: 99%

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

et al. 2017

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“…In Ref. [18] it is reported a decrease of film thickness, due to film density change, of about 1.5 % from the transparent phase to the blue phase. The parameters related to the optical properties of FICO nanoparticles are taken from Kriegel et al [15].…”

Section: Methodsmentioning

confidence: 97%

“…We have extracted, from Toccafondi et al [18], the Sellmeier equation of p-DTE in the transparent phase:…”

Section: Methodsmentioning

confidence: 99%

“…The two materials act differently upon UV irradiation: FICO nanoparticles are photodoped by UV light, with a subsequent increase of carrier density that results in a blue shift of their near infrared plasmon resonance. The photochromic polymer, a diarylethene-based polyester (pDTE) in this case [18], shows an increase of the refractive index. Thus, a photonic crystal containing pDTE shows a red shift of the photonic band gap upon UV irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Light-induced switching in pDTE–FICO 1D photonic structures

Kriegel

Scotognella

2018

Optics Communications

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We propose the design of 1D photonic crystals and microcavities in which fluorine-indium codoped cadmium oxide (FICO) nanocrystal based layers and layers of diarylethene-based polyester (pDTE) are alternated or embedded in a microcavity. The irradiation with UV light results in two different behaviours: i) it dopes the FICO nanocrystals inducing a blue shift of their plasmonic resonances; ii) it changes the real part of the refractive index of the photochromic pDTE polymer. These two behaviours are combined in the proposed photonic structures and can be useful for switchable filters and cavities for light emission.

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“…62 With this in mind, thin films of PMMA containing different DAE derivatives were prepared by spin-casting CHCl 3 solutions of PMMA and the corresponding photochrmomic dyes onto quartz substrates. Photochromism in PMMA films is quite similar to that in ethyl acetate (Fig.…”

Section: Photochromism In the Polymer Matrixmentioning

confidence: 99%

Substitution effect on the photochromic properties of benzo[b]thiophene-1,1-dioxide based diarylethenes

Chen

et al. 2015

RSC Adv.

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Benzo[b]thiophene-1,1-dioxide based diarylethenes (DAEs), BTT-1 to BTT-4, containing methyl, phenyl, formyl and triphenylamine groups at the 5,5'-position of thiophene rings have been developed for insight into substituent effects on the absorption and photochromic properties. Electron-donating substituents, such as phenyl and triphenylamine groups, are found to be effective to shift the absorption band to a longer wavelength and to decrease the cyclization quantum yield.Electron-withdrawing formyl group can increase the cyclization quantum yield, but reduce the thermal stability of the ringclosed isomer to some extent. BTT-4 bearing a triphenylamine group shows the poorest fatigue resistance among these four compounds, which is possibly due to the larger extended π-conjugation length in the ring-closed isomer. BTT-2 bearing a phenyl unit undergoes typical photochromic reaction not only in solution, but also in the PMMA thin film and in the bulky crystals with excellent fatigue resistance and thermal stability.

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Photochromic and photomechanical responses of an amorphous diarylethene-based polymer: a spectroscopic ellipsometry investigation of ultrathin films

Cited by 25 publications

References 77 publications

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

Light-induced switching in pDTE–FICO 1D photonic structures

Substitution effect on the photochromic properties of benzo[b]thiophene-1,1-dioxide based diarylethenes

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