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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 1 — Jan. 5, 2009
  • pp: 358–364

Measured luminance and visual appearance of multi-color persistent phosphors

Dirk Poelman, Nursen Avci, and Philippe F. Smet  »View Author Affiliations

Optics Express, Vol. 17, Issue 1, pp. 358-364 (2009)

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In the past decade, several persistent phosphors were intensively studied, such as CaAl2O4:Eu,Nd (blue) and SrAl2O4:Eu,Dy (green). Yellow-to-red emitting persistent phosphors have also been identified. All these phosphors are normally evaluated by measuring their afterglow as a function of time in photometric units. However, the eye sensitivity curve shifts from photopic vision to scotopic vision upon decreasing light intensity, with a corresponding decrease in red-sensitivity. Performance of red-emitting persistent phosphors thus cannot be described with usual photometry. An alternative description is presented, based on recent vision research in the intermediate (mesopic) region and using a unified system of photometry. It turns out that this effect seriously compromises the development of red-emitting persistent phosphors. This is illustrated on a number of commercially available persistent phosphors.

© 2009 Optical Society of America

OCIS Codes
(120.5240) Instrumentation, measurement, and metrology : Photometry
(160.2540) Materials : Fluorescent and luminescent materials
(250.5230) Optoelectronics : Photoluminescence
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(330.4060) Vision, color, and visual optics : Vision modeling

ToC Category:
Vision, color, and visual optics

Original Manuscript: November 12, 2008
Revised Manuscript: December 22, 2008
Manuscript Accepted: December 22, 2008
Published: January 2, 2009

Virtual Issues
Vol. 4, Iss. 3 Virtual Journal for Biomedical Optics

Dirk Poelman, Nursen Avci, and Philippe F. Smet, "Measured luminance and visual appearance of multi-color persistent phosphors," Opt. Express 17, 358-364 (2009)

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