Luminescence of multicomponent phosphate glasses with manganese

Abstract

The emission spectra both of fluorescence at room temperature and at 520 K and of thermostimulated luminescence (TSL) of multicomponent alumino-phosphate glasses with various Mn concentration (0·2–20mol%) has been measured. The colour of fluorescence and TSL changes from orange to yellow with increasing temperature at constant concentration of Mn and from yellow to red with increasing concentration at constant temperature. The colour shift with temperature can be explained by means of decreasing field strength, Dq with increasing distance Mn-O. The intensity of orange fluorescence at R.T. increases with increasing concentration up to about 5% Mn and then decreases in consequence of concentration quenching. On the contrary, the TSL intensity reaches its maximum at concentraction of about one order of magnitude smaller. The different behaviour of fluorescence and TSL intensity in dependence on Mn is probably due to their different elementar mechanisms.