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The crystal-field splitting levels in YPO4 Eu3+ micro-crystals are investigated by the Zeeman splitting in photoluminescence spectrum. X-ray diffraction pattern and microscopic images indicate small tetragonal nano-particles attaching on the surfaces of the mainly hexagonal micro-crystals. The peaks correspond to the transitions from 5D0 excited state to 7F1 and 7F2 ground states are split in pulsed...
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