Fluorescence-enabled colored bilayer sub-ambient radiative cooling coatings
AssigneeCity University of Hong Kong
InventorsDangyuan LEI, Xue MA, Ying LIU
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Abstract
A colored bilayer sub-ambient radiative cooling coating designed to enhance solar reflectance and aesthetic coloration is introduced. The coating includes a white bottom layer containing TiO2 or ZrO2 nanoparticles, and hollow glass spheres dispersed in a polymer matrix, and a colored top layer containing SiO2 microspheres and fluorescent pigments selected from Sr2Si5N8:Eu2+, Y3A15O12:Ce3+, (Ba,Sr)SiO4:Eu2+, or SrO·Al2O3:Eu phosphors dispersed in a polymer matrix. This bilayer structure achieves an effective solar reflectance of at least 90% and reduces surface temperature by at least 3° C. compared to ambient air, providing energy-efficient cooling with aesthetic appeal.
Claims12
A colored bilayer sub-ambient radiative cooling coating for improving solar reflectance and coloration, comprising:
- a white bottom layer, comprising TiO2 or ZrO2 nanoparticles and hollow glass spheres;
- and
- a colored top layer positioned on the white bottom layer, comprising SiO2 microspheres and fluorescent pigment selected from Sr2Si5N8:Eu2+ phosphors, Y3Al5O12:Ce3+ phosphors, (Ba,Sr)SiO4:Eu2+ phosphors, or SrO·Al2O3:Eu phosphors;
- wherein the colored bilayer sub-ambient radiative cooling coating achieve an effective solar reflectance of at least 90% and a sub-ambient temperature reduction of at least 3° C. compared to ambient air.
The colored bilayer sub-ambient radiative cooling coating, wherein the white bottom layer achieves a solar reflectance of at least 95% independently of the colored top layer.
Dependencies are inferred from the claim text.