Silica effects on spectral and photophysical properties of rhodamine 6G in polyurethane matrix - T. V. Bezrodna; O .I. Antonenko; L. F. Kosjanchuk; A. N. Roshchin; V. I. Bezrodnyj; A. M. Negrijko; A. O. Jaskovets (Reports of the National Academy of Sciences of Ukraine, 2019)