Abstract
The luminescent properties of the green emitting have been studied. The emission lines in the visible region are assigned to the transitions from 3P0 to 3HJ and to 3F2 of Pr+3; the main green emission lines around 514 nm are attributed to the transition . There was a small shift, about 160 cm−, of the emission lines to higher energy with an increase in host cation radius (Y to Gd to La). The two broad excitation bands in , centered at 255 and 290 nm, are due, respectively, to host excitation and to excitation associated with an interaction of activator and host. The optimum activator concentration of phosphor is at about per mole of phosphor. Quadrupole‐quadrupole interaction is involved in the concentration quenching of the green emission. * Electrochemical Society Active Member.
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