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Energy transfer processes is nominally pure and Mn 2+ - and Dy 3+ -doped Ca 4 GdO(BO 3 ) 3 have been investigated. The host lattice is characterised by linear Gd 3+ chains. At 4.2 K long range energy migration is hampered by Gd 3+ traps. At room temperature the excitation energy is trapped by the acceptors (viz. Mn ...