In-plane anisotropic photoresponse in all-polymer planar microcavities

Knarr, R.; Manfredi, Giovanni; Martinelli, Elisa; Pannocchia, Matteo; Repetto, Diego; Mennucci, Carlo; Solano, Ilaria; Canepa, M.; Mongeot, F. Buatier de; Galli, Giancarlo; Comoretto, Davide

doi:10.1016/j.polymer.2016.01.009

Cited by 17 publications

(25 citation statements)

References 52 publications

(73 reference statements)

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“…From the fabrication point of view, polymer DBRs are interesting thanks to the variety of techniques available both at the laboratory and at the industrial scale. At the lab scale they are fabricated via spin‐coating (Figure a),[7b,33e,68a,84] dip‐coating (Figure d),[28e] layer‐by‐layer deposition, and by the self‐assembling of block copolymers (BCPs, Figure ) . The latter is arising interest thanks to the possibility to couple polymers pairs otherwise not processable together .…”

Section: Materials and Fabrication Techniquesmentioning

confidence: 99%

“…Notwithstanding the Q ‐factor of polymer MCs is not enormous, macromolecular materials show superior mechanical properties, easy processing and economic advantages. These characteristics secure the integration in polymer DBRs of several novel photoactive materials including organic molecules,[7b,25,26,68a,84a,114] inorganic quantum dots,[33f] J‐aggregates,[33g] hybrid perovskites,[7c] as well as photochromic and nonlinear organic materials. [28e,84a,115] All such materials are hardly compatible with the processing of inorganic DBRs, and in particular with their processing temperature.…”

Section: Applicationsmentioning

confidence: 99%

“…These characteristics secure the integration in polymer DBRs of several novel photoactive materials including organic molecules,[7b,25,26,68a,84a,114] inorganic quantum dots,[33f] J‐aggregates,[33g] hybrid perovskites,[7c] as well as photochromic and nonlinear organic materials. [28e,84a,115] All such materials are hardly compatible with the processing of inorganic DBRs, and in particular with their processing temperature. [7a,33f,g,68a,84a,116] Similarly, mesoporous inorganic systems need high‐temperature sintering processes, which would affect organic and polymer emitters, ligands, surface capping layers, unless postgrowth infiltration processes are used.…”

Section: Applicationsmentioning

confidence: 99%

See 2 more Smart Citations

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

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170

226

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photonic states (PDOS), [2][3][4] which helps explaining the photoluminescence (PL) changes of materials when embedded in the PhC structure.Traditionally, PhCs have been made carving bulky inorganic dielectrics or sem iconductors. These structures are still a hot topic in photonics for optical fibers, light emitting diodes (LEDs), sensors, photo voltaic devices, lasers, discrete and integrated optical components, lightening, and quantum computing. [6] However, new solution processable photoactive materials (e.g., organic semiconductors, quantum dots, hybrid perovskites, and selfassem bling supramolecular systems) stimulated the development of PhCs grown with organic and colloidal materials by solution and melt processes. [7] Among PhCs, distributed Bragg reflectors (DBRs) are cur rently the most interesting owing to their planar structure which generates a simple optical response that represents a playground to understand deep physical concepts, as described in Sections 2.4 and 4. DBRs are indeed made of alternated thin films of different dielectric materials. This simplicity makes them the only PhCs that can take advantage of large area growths (see Section 3.1). [8] Such fabrication methods are unconceivable with bulky inorganic DBRs and might reduce processing costs and enhance customizability, also on industrial scale, thus adding unprecedented market opportunities. Figure 1 illustrates the evolution and fabrications of solution and melt processed DBRs. The top of the Figure displays three wellknown natural DBRs belonging to animal and plant reigns: the mother of pearl, [9] the Panamanian Tortoise beetle exoskel eton, [10] and the Pollia Condensata skin, [11] whose growth is driven by the thermodynamics of spinodal phase separation. [12] The interest in these natural structures leads to their emulation until the development of solutionbased fabrication methods for flexible synthetic DBRs made of polymers and inorganic nanoparticles (Figure 1). At the base of Figure 1, we also show some applications arose only in the last decades. From left to right: the use of DBRs in functional architecture, in enhance ment of photon absorption for photovoltaic cells and modules, emission control, lasing, and sensing. [7c,13] In this paper we will first briefly review the properties of DBRs and then focus on the reasons that guided the research toward new solutionbased and largearea fabrications, describing current processes used both at the laboratory and largearea scales. We will then review the main applications of these structures comparing the performances of mesoporous inorganic and polymer devices. An overview on the properties and applications of polymer and inorganic planar 1D photonic crystals fabricated from solution is provided here. In the last decades, photonic crystals became technologically relevant for light management, photovoltaics, sensing, and lasing. Such structures are traditionally produced by lithographic and vacuum techniques, but the need to reduce costs and to scale-up the fabrication have lea...

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Section: Materials and Fabrication Techniquesmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

Self Cite

170

226

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“…Polymer photonic crystals (PhCs) are viable media to achieve plastic devices based on PBI J‐aggregates. These materials have been already demonstrated very efficient for photoluminescence enhancement and directional control, lasing action, switching, and sensing . Among them, monodimensional multilayered structures represent the simplest system from the fabrication point of view.…”

Section: Introductionmentioning

confidence: 99%

All‐Polymer Photonic Microcavities Doped with Perylene Bisimide J‐Aggregates

Lova

Grande

Manfredi

et al. 2017

Advanced Optical Materials

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Thanks to exciting chemical and optical features, perylene bisimide (PBI) J-aggregates\ud are ideal candidates to be employed for high-performance plastic photonic devices.\ud However, they generally tend to form - stacked H-aggregates that are unsuitable for\ud implementation in polymer resonant cavities. In this work, we demonstrate the efficient\ud compatibilization of a tailored perylene bisimide forming robust J-aggregated\ud supramolecular polymers into amorphous polypropylene. The new nanocomposite was\ud then implemented into an all-polymer planar microcavity which provides strong and\ud directional spectral redistribution of the J-aggregate photoluminescence, owing to a\ud strong modification of the photonic states. A systematic analysis of the photoemitting\ud processes, including photoluminescence decay and quantum yields, shows that the\ud optical confinement in the polymeric microcavity does not introduce any additional nonradiative\ud de-excitation pathways to those already found in the J-aggregate\ud nanocomposite film and pave the way to PBI-based high-performance plastic photonic\ud devices

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“…Despite significant progress in the research of azobenzene‐containing LC‐systems, great potential for applications in photonics, data storage, photoactuation, there are still many open issues regarding the influence of the chemical structure of LC polymers and their mesophase behavior on photoisomerization and photo‐orientation processes.…”

Section: Introductionmentioning

confidence: 99%

Photo-Orientation Phenomena in Photochromic Liquid Crystalline Azobenzene-Containing Polymethacrylates with Different Spacer Length

Bobrovsky

Shibaev

Piryazev

et al. 2017

Macromol. Chem. Phys.

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Synthesis and investigation of the phase behavior and photo‐optical properties of two chiral liquid‐crystalline polymers with azobenzene‐containing side groups having different spacer lengths, 6 and 10 methylene groups (PMAzo‐6 and PMAzo‐10, respectively) are described. Formation of different smectic phases and high‐temperature cholesteric phase is studied by polarizing optical microscope, differential scanning calorimetry, and X‐ray investigations. It is shown that UV‐irradiation induces effective reversible E–Z photoisomerization in polymer solutions and films. Atomic force microscopy (AFM) study reveals substantial changes in the surface topography of the polymer PMAzo‐6 film after UV‐irradiation, whereas PMAzo‐10 surface remains the same. Irradiation by polarized light (457 nm) results in photo‐orientation process in polymer films consequential in significant alignment of the chromophores in direction perpendicular to the polarization plane of the incident light. A significant difference is found in thermal stability of the photoinduced alignment; an annealing of PMAzo‐10 irradiated samples results in a slight decrease of dichroism values (down to 0.57); whereas the dichroism increases up to very high values (0.91) for PMAzo‐6.

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In-plane anisotropic photoresponse in all-polymer planar microcavities

Cited by 17 publications

References 52 publications

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Advances in Functional Solution Processed Planar 1D Photonic Crystals

All‐Polymer Photonic Microcavities Doped with Perylene Bisimide J‐Aggregates

Photo-Orientation Phenomena in Photochromic Liquid Crystalline Azobenzene-Containing Polymethacrylates with Different Spacer Length

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