Compositional optimization of emission properties for rare-earth doped fluoride phosphate glasses: structural investigations via NMR, EPR, and optical spectroscopies - Galleani, Gustavo; Doerenkamp, Carsten; Santagneli, Silvia; Magon, Claudio José; de Camargo, Andrea Simone Stucchi; Eckert, Hellmut (Journal of Physical Chemistry C, 2019)