LUMINESCENCE AND ENERGY MIGRATION IN A QUASI-ONE-DIMENSIONAL GD3- GDMGB5O10( COMPOUND )

Energy transfer processes in nominally pure GdMgB5O10 and in GdMgB5O10 doped with Fe2+ and Tb3+ have been studied. The host lattice contains linear Gd3+ chains. At 4.2K long range energy migration over the Gd3 ions is hampered by Gd3+ traps. At room temperature the energy migrat es over the Gd3+ ions and is trapped by the intentionally codoped acce pters Fe2+ and Tb3+ and by unknown defects and impurities. The concent ration of the latter is estimated to be 2 x 10(-4) mole fraction. The energy migration proved to be quasi-one-dimensional. The intrachain Gd --> Gd energy transfer probability is estimated to be similar to 10(1 0) s(-1). The interchain Gd --> Gd transfer rate is estimated to be si milar to 10(4) s(-1).