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VISible to far-IR optical tuning: passive DAYtime cooling by hierarchical structures and hybrid materials

Total Cost €


EC-Contrib. €






 VISIRday project word cloud

Explore the words cloud of the VISIRday project. It provides you a very rough idea of what is the project "VISIRday" about.

polymers    lithography    paints    nanostructures    device    externally    experimental    spectral    convinced    radiatively    examples    reflection    building    300    colloidal    mesoparticles    technologies    removed    heat    off    class    load    finite    ant    efficient    transparent    nature    minimized    inspired    cold    radically    thermal    mid    self    insights    consumption    simulations    silver    adjusted    solar    lower    micro    influx    engine    ir    supporting    space    hierarchically    provides    hybrid    visirday    structures    polariton    understand    beetles    radiance    finely    scattering    materials    mix    metallic    surface    write    phonon    assembly    breaking    radiative    urgently    emit    ground    conceive    direct    material    offers    stringent    energy    nano    add    wavelengths    outer    entire    complement    combine    counteract    13    structured    combination    adjustable    optical    team    mesostructured    saharan    optimum    fundamental    green    atmosphere    absorption    nm    holistic    push    am    window    white    tuneable    chance    reflective    intricate    cooling    fibres    sky    block    daytime    concomitantly    rules    emissive   

Project "VISIRday" data sheet

The following table provides information about the project.


Organization address
postcode: 95447

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Project website
 Total cost 1˙487˙636 €
 EC max contribution 1˙487˙636 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-STG
 Funding Scheme ERC-STG
 Starting year 2017
 Duration (year-month-day) from 2017-03-01   to  2022-02-28


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERSITAT BAYREUTH DE (BAYREUTH) coordinator 1˙487˙636.00


 Project objective

Efficient daytime cooling without the need for a heat engine is an essential technology to lower our overall energy consumption. Nature offers a chance to off-load heat directly into the cold outer space via the so-called “sky window”: a spectral range from 8 – 13 µm, where our atmosphere is transparent. Concomitantly, solar radiance influx needs to be minimized by scattering and reflection, which would counteract the radiatively removed energy. VISIRday aims to provide ground-breaking new materials and concepts to emit thermal energy directly into this transparent sky window. A radically holistic approach is necessary to understand and design the optical properties of nano- and mesostructured materials over the entire spectral range (300 nm – 20 µm), with the mid-IR sky window being fully emissive, and all other spectral wavelengths being fully reflective. I will therefore combine top-down direct write lithography with intricate bottom-up colloidal self-assembly to device hierarchically structured systems fully addressing these stringent optical properties. A new material class – surface phonon polariton supporting nano- and mesoparticles – with adjustable absorption properties in the mid-IR range, will take a leading role as novel colloidal building block. In combination with polymers and metallic nanostructures my team will demonstrate hybrid structures with finely adjusted and even externally tuneable optical properties. Simulations based on finite element modelling to conceive optimum design rules will complement the experimental work. Inspired by examples from nature, namely white beetles and the Saharan silver ant, I will push the fundamental insights towards novel technologies such as radiative daytime cooling paints and fibres. I am convinced that this project provides the urgently needed materials and concepts to add radiative daytime cooling to the existing mix of green energy technologies.


year authors and title journal last update
List of publications.
2019 Philipp, A., Pech-May, N. W., Kopera, B. A. F., Lechner, A. M., Rosenfeldt, S., Retsch, M.
Direct Measurement of the In-Plane Thermal Diffusivity of Semitransparent Thin Films by Lock-In Thermography: An Extension of the Slopes Method
published pages: 8476-8483, ISSN: 0003-2700, DOI: 10.1021/acs.analchem.9b01583
Analytical Chemistry 91, 13 2020-02-27

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The information about "VISIRDAY" are provided by the European Opendata Portal: CORDIS opendata.

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