Abstract
It is shown that substrates of single crystal yttrium aluminum garnet (YAG) can be successfully doped with terbium by ion implantation and activated as a phosphor by subsequent annealing. High temperature thermal annealing has given luminous efficiencies comparable with single crystal material doped directly during Czochralski growth while initial attempts at laser annealing have proved less successful. A penetron effect, yielding blue or green luminescence according to the electron beam voltage, has been observed for the thermally annealed material.
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