Fluorescent cooling of objects exposed to sunlight – The ruby example

Berdahl, Paul; Chen, Sharon S.; Destaillats, Hugo; Kirchstetter, Thomas W.; Levinson, Ronnen M.; Zalich, Michael A.

doi:10.1016/j.solmat.2016.05.058

Fluorescent cooling of objects exposed to sunlight – The ruby example

Journal Article · Sat Jun 04 00:00:00 EDT 2016 · Solar Energy Materials and Solar Cells

DOI:https://doi.org/10.1016/j.solmat.2016.05.058· OSTI ID:1398444

Berdahl, Paul; Chen, Sharon S.; Destaillats, Hugo; Kirchstetter, Thomas W.; Levinson, Ronnen M.; Zalich, Michael A.

Various pigments are used to formulate desirable non-white colors that stay cooler in the sun than alternatives, which is particularly useful for hot climate areas. These cool pigments provide a high near-infrared (NIR) reflectance in the solar infrared range of 700-2500 nm, and also a color specified by a reflectance spectrum in the 400-700 nm visible range. Still cooler materials can be formulated by also utilizing the phenomenon of fluorescence (photoluminescence). Ruby, Al₂O₃ :Cr, is a prime example, with efficient emission in the deep red (~694 nm) and near infrared (700-800 nm). A layer of synthetic ruby crystals on a white surface having an attractive red color can remain cooler in the sun than conventional red materials. Ruby particles can also be used as a red/pink pigment. Increasing the Cr:Al ratio produces a stronger (darker) pigment but doping above ~3 wt% Cr₂O₃ causes concentration quenching of the fluorescence. The system quantum efficiency for lightly doped ruby-pigmented coatings over white is high, 0.83 ± 0.10.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1398444

Alternate ID(s):: OSTI ID: 1325267

Journal Information:: Solar Energy Materials and Solar Cells, Journal Name: Solar Energy Materials and Solar Cells Journal Issue: C Vol. 157; ISSN 0927-0248

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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