Check out a new publication from our collaborators about persistent luminescence in glass-ceramics:

Massera, J., Gaussiran, M., Głuchowski, P., Lastusaari, M., Petit, L., Hölsä, J., and Hupa, L., Effect of the glass melting condition on the processing of phosphate-based glass–ceramics with persistent luminescence properties, Opt. Mater. 52 (2016) 56-61.
Read online: http://dx.doi.org/10.1016/j.optmat.2015.12.006