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Title: High quantum yield of the Egyptian blue family of infrared phosphors (MCuSi4O 10, M = Ca, Sr, Ba)

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5019808· OSTI ID:1461151
ORCiD logo [1];  [2];  [1];  [1];  [1];  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Shepherd Color Company, Cincinnati, OH (United States)
  3. PPG, Coatings Innovation Center, Allison Park, PA (United States)

The alkaline earth copper tetra-silicates, blue pigments, are interesting infrared phosphors. The Ca, Sr, and Ba variants fluoresce in the near-infrared (NIR) at 909, 914, and 948 nm, respectively, with spectral widths on the order of 120 nm. The highest quantum yield Φ reported thus far is ca. 10%. We use temperature measurements in sunlight to determine this parameter. The yield depends on the pigment loading (mass per unit area) ω with values approaching 100% as ω → 0 for the Ca and Sr variants. Although maximum quantum yield occurs near ω = 0, maximum fluorescence occurs near ω = 70 g m-2, at which Φ = 0.7. The better samples show fluorescence decay times in the range of 130 to 160 μs. The absorbing impurity CuO is often present. Good phosphor performance requires long fluorescence decay times and very low levels of parasitic absorption. In conclusion, the strong fluorescence enhances prospects for energy applications such as cooling of sunlit surfaces (to reduce air conditioning requirements) and luminescent solar concentrators.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
Grant/Contract Number:
AC02-05CH11231; EE0006347
OSTI ID:
1461151
Alternate ID(s):
OSTI ID: 1437520
Journal Information:
Journal of Applied Physics, Vol. 123, Issue 19; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (2)

Practical application of visible-induced luminescence and use of parasitic IR reflectance as relative spatial reference in Egyptian artifacts journal May 2019
Late production of Egyptian blue: synthesis from brass and its characteristics journal June 2019

Figures / Tables (13)


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