- Measured luminance and visual appearance of multi-color persistent phosphorsDirk Poelman
Department of Solid State Sciences, LumiLab, Ghent University, Gent, Belgium
Opt Express 17:358-64. 2009..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...
- Photometry in the dark: time dependent visibility of low intensity light sourcesDirk Poelman
LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281 S1, B 9000 Gent, Belgium
Opt Express 18:26293-9. 2010..The resulting metric is a 'visibility index' and preliminary tests show that it more realistically describes the perceived brightness of persistent luminescent materials than the common photometric standards...