timeresolved fluorescence linenarrowing of eu3 in biocompatible eutectic glassceramics the spectroscopic properties of eu3 in biocompatible glass and glassceramic eutectic rods of composition 08casio302ca3po42 doped with 05 wt of eu2o3 are investigated to explore their potential applications as optical probes the samples were obtained by the laser floating zone technique depending on the growth rate they exhibit three two crystalline and one amorphous or two one crystalline and one amorphous phases the crystalline phases correspond to ca2sio4 and apatitelike structures at high growth rates the system presents an amorphous arrangement which gives a glass phase the results of timeresolved fluorescence line narrowing spectroscopy obtained under excitation within the inhomogeneous broadened 7f05d0 absorption band allow to isolate the emission from eu3 ions in the crystalline and amorphous environments and to accurately correlate the spectroscopic properties with the microstructure of these eutectics