Charge transfer luminescence of hafnates under synchrotron vacuum ultraviolet excitation

Abstract

Under synchrotron vacuum ultraviolet excitation, three different hafnates (BaHf(PO4)(2), BaHf(BO3)(2) and BaHfSi3O9) show self-activated luminescence with peaks ranging from 275-335 nm, which is attributed to the charge-transfer luminescence from the hafnate (HfO68-) group. Upon doping Eu2+ into BaHfSi3O9, host sensitization of Eu2+ emission via hafnate intrinsic emission is demonstrated.