Fluorescent cooling of objects exposed to sunlight – The ruby example
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
- OSTI Identifier:
- 1398444
- Alternate Identifier(s):
- OSTI ID: 1325267
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Solar Energy Materials and Solar Cells
- Additional Journal Information:
- Journal Volume: 157; Journal Issue: C; Journal ID: ISSN 0927-0248
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 14 SOLAR ENERGY
Citation Formats
Berdahl, Paul, Chen, Sharon S., Destaillats, Hugo, Kirchstetter, Thomas W., Levinson, Ronnen M., and Zalich, Michael A. Fluorescent cooling of objects exposed to sunlight – The ruby example. United States: N. p., 2016.
Web. doi:10.1016/j.solmat.2016.05.058.
Berdahl, Paul, Chen, Sharon S., Destaillats, Hugo, Kirchstetter, Thomas W., Levinson, Ronnen M., & Zalich, Michael A. Fluorescent cooling of objects exposed to sunlight – The ruby example. United States. https://doi.org/10.1016/j.solmat.2016.05.058
Berdahl, Paul, Chen, Sharon S., Destaillats, Hugo, Kirchstetter, Thomas W., Levinson, Ronnen M., and Zalich, Michael A. Sat .
"Fluorescent cooling of objects exposed to sunlight – The ruby example". United States. https://doi.org/10.1016/j.solmat.2016.05.058. https://www.osti.gov/servlets/purl/1398444.
@article{osti_1398444,
title = {Fluorescent cooling of objects exposed to sunlight – The ruby example},
author = {Berdahl, Paul and Chen, Sharon S. and Destaillats, Hugo and Kirchstetter, Thomas W. and Levinson, Ronnen M. and Zalich, Michael A.},
abstractNote = {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.},
doi = {10.1016/j.solmat.2016.05.058},
journal = {Solar Energy Materials and Solar Cells},
number = C,
volume = 157,
place = {United States},
year = {Sat Jun 04 00:00:00 EDT 2016},
month = {Sat Jun 04 00:00:00 EDT 2016}
}
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