Abstract
Large band-gap materials doped with rare earth-ions are currently of great interest as new vacuum UV phosphors for lighting and displays. In this report, the optical properties of YPO 4 and YBO 3 doped with Pr, Tm, Er, and Eu are described. The emission resulting from the VUV excitation of the parity allowed 4f n - 1 5d 1 states and their quantum efficiencies are reported. Relaxation between the 4f n - 1 5d 1 and nearby 4f excited states is observed for some of these ions, and the dynamics of these excited states is reported. In doubly-doped samples, the prospects for quantum cutting by using cross relaxation energy transfer in which some of the energy of the initially excited 4f n - 1 5d 1 state is transferred to an acceptor ion so that both donor and acceptor ions are left in an excited state from which they each can emit a photon are examined.
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