Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Wu, Mengchun; Shi, Yusuf; Li, Renyuan; Wang, Peng

doi:10.1021/acsami.8b15574

Cited by 158 publications

(117 citation statements)

References 49 publications

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“…Light is a clean, noninvasive, and tunable stimulus that allows the properties of molecules and materials to be remotely controlled in a reversible manner with remarkable time and spatial resolution. [1][2][3][4][5][6][7][8] Of particular interest are luminescent materials that undergo emission modulation upon irradiation, [9][10][11][12] interconversion and b) the photothermal effects generated by selective (nano)structures under NIR irradiation, which have already been employed to light-trigger PCM melting for drug delivery [48] and energy saving [49] and storage [50] purposes. In this work we aim to merge these two concepts to develop a novel, straightforward, and universal methodology toward NIR-responsive thermofluorochromic materials, with which a variety of different NIR-induced fluorescence modulation schemes could be obtained by simply combining three essential components: fluorescent dyes, PCMs capable of altering the properties of the emitters upon interconversion between their solid and liquid states, and NIR-absorbing noble metal nanoparticles [51] (NMNPs) that photothermally induce the phase transition of the PCMs under irradiation (Figure 1a).…”

Section: Introductionmentioning

confidence: 99%

Solid Materials with Near‐Infrared‐Induced Fluorescence Modulation

Otaegui

Rubirola

Ruiz‐Molina

et al. 2020

Advanced Optical Materials

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which are exploited in high-density data storage [13,14] and information processing, [15] white light generation, [16] (bio) sensing and imaging, [17-20] anticounterfeiting technologies, [21,22] and photowritable/erasable fluorescent inks, [23] among other areas. For many of these applications, the use of near-infrared (NIR) radiation to achieve luminescence modulation would be highly beneficial, e.g., to reach higher penetration depths with lower photodamage for (bio)imaging probes [18,24] or to develop advanced security inks for anticounterfeiting. [25] Currently, most common methodologies applied to achieve fluorescence modulation are based on the reversible interconversion of photochromic dyes. [9,10,11-18,19-21] However, these systems suffer from important drawbacks that are limiting their application in commercial products. On one hand, the interconversion of photochromic dyes are generally based on isomerization processes that involve large polarity and geometrical changes, which are often detrimentally affected by the surrounding matrix when these compounds are transferred from solution to the solid state. This is especially the case for photoswitchable luminescent materials based on T-type photochromes, [26] for which novel strategies are being developed to favor dye (photo) isomerization in solid matrices (e.g., by covalently attaching bulky moieties to increase the surrounding free volume [22,27] or by using photoisomersable compounds with minimal conformational changes [26,28]). On the other hand, photochromic dyes typically operate under highly energetic UV or visible radiation (e.g., spiropyrans) which contributes significantly to fast dye degradation. [29] Actually, making photochromic compounds sensitive to NIR radiation still remains a challenge that requires intricate synthetic procedures [30-33] and/or multiphoton excitation under high irradiation powers. [34-40] As such, their incorporation into more complex systems to attain NIR-induced luminescence modulation has been largely hampered to date. As an alternative to photochromic-based systems, we report herein a conceptually different strategy to obtain NIR-driven fluorescence modulation in the solid state, which takes advantage of a) the recent discovery by us [41-43] and others [44-47] that the emission of selective dyes dispersed in phase change materials (PCMs) can be thermally varied upon solid-to-liquid Solid molecular materials modulating their luminescent properties upon irradiation are typically based on photochromic dyes. Despite these are potentially interesting for applications such as anticounterfeiting, bioimaging, optical data storage, and writable/erasable devices, key features are preventing their use in marketable products: the lack of straightforward strategies to obtain near infrared (NIR) radiation-responding photochromic dyes and the dramatic response modification these molecules suffer in solids. Herein a photochrome-free approach is reported to achieve solid materials whose luminescence modulation is induced by NIR radi...

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Section: Introductionmentioning

confidence: 99%

Solid Materials with Near‐Infrared‐Induced Fluorescence Modulation

Otaegui

Rubirola

Ruiz‐Molina

et al. 2020

Advanced Optical Materials

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“…[3,4] To decrease the impact of indoor heating and cooling on the environment, environmentally friendly and energy-saving alternatives are urgently needed. To date, several alternative technologies combining adaptive heating and cooling in one system have been developed, including smart windows, [5][6][7][8][9][10][11][12][13][14] Janus membranes, [15,16] and solar chimneys commercially available poly(dimethylsiloxane) (PDMS) precursor followed by curing in air ( Figure S1, Supporting Information). Similar to normal PDMS precursors, the emulsion needs about 6 days at room temperature to get fully cured, but could solidify within the first 20 min, accompanied by the fixation of the embedded water droplets.…”

Section: Doi: 101002/adma202000870mentioning

confidence: 99%

Switchable Cavitation in Silicone Coatings for Energy‐Saving Cooling and Heating

et al. 2020

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Space cooling and heating currently result in huge amounts of energy consumption and various environmental problems. Herein, a switching strategy is described for efficient energy‐saving cooling and heating based on the dynamic cavitation of silicone coatings that can be reversibly and continuously tuned from a highly porous state to a transparent solid. In the porous state, the coatings can achieve efficient solar reflection (93%) and long‐wave infrared emission (94%) to induce a subambient temperature drop of about 5 °C in hot weather (≈35 °C). In the transparent solid state, the coatings allow active sunlight permeation (95%) to induce solar heating to raise the ambient temperature from 10 to 28 °C in cold weather. The coatings are made from commercially available, cheap materials via a facile, environmentally friendly method, and are durable, reversible, and patternable. They can be applied immediately to various existed objects including rigid substrates.

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“…[ 30 ] Particularly, selective absorption (emission) is attractive in a lot of fields, such as solar energy conversion, [ 30,54 ] thermal management, [ 55,56 ] radiative cooling, [ 46 ] and smart windows. [ 57,58 ] Figure summarizes seven classes of SAs (SEs) targeting at different wavelength regions and their applications. The first class of selective absorber for the visible light (0.4–0.7 µm) has been widely used in photodetectors and solar cells.…”

Section: Selective Absorbers (Sas) and Selective Emitters (Ses)mentioning

confidence: 99%

Spectrally Selective Absorbers/Emitters for Solar Steam Generation and Radiative Cooling‐Enabled Atmospheric Water Harvesting

Lin

Huang

et al. 2020

Global Challenges

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Renewable energy harvesting from the sun and outer space have aroused significant interest over the past decades due to their great potential in addressing the energy crisis. Furthermore, the harvested renewable energy has benefited another global challenge, water scarcity. Both solar steam generation and passive radiative cooling‐enabled atmospheric water harvesting are promising technologies that produce freshwater in green and sustainable ways. Spectral control is extremely important to achieve high efficiency in the two complementary systems based on absorbing/emitting light in a specific wavelength range. For this reason, a broad variety of solar absorbers and IR emitters with great spectral selectivity have been developed. Although operating in different spectral regions, solar selective absorbers and IR selective emitters share similar design strategies. At this stage, it is urgent and necessary to review their progress and figure out their common optical characteristics. Herein, the fundamental mechanisms and recent progress in solar selective absorbers and IR selective emitters are summarized, and their applications in water production are reported. This review aims to identify the importance of selective absorbers/emitters and inspire more research works on selective absorbers/emitters through the summary of advances and the establishment of the connection between solar absorbers and IR emitters.

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Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Cited by 158 publications

References 49 publications

Solid Materials with Near‐Infrared‐Induced Fluorescence Modulation

Solid Materials with Near‐Infrared‐Induced Fluorescence Modulation

Switchable Cavitation in Silicone Coatings for Energy‐Saving Cooling and Heating

Spectrally Selective Absorbers/Emitters for Solar Steam Generation and Radiative Cooling‐Enabled Atmospheric Water Harvesting

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