Emissions due to inter-configurational 4f15d1-4f2 electronic transitions of Pr3+ ions are scarcely observed in phosphate glasses. In this work, the intense UV emissions (at 311 and 327 nm) owing to the inter-configurational f-d transitions of Pr3+ have been reported in Pr3+-doped strontium phosphate glasses. Characteristic blue (481, 488 nm), green (522 nm), orange (597, 610 nm), and red (638 nm) emissions are also observed due to the intra-configurational f-f transitions. Possible mechanisms controlling the intra- and inter-configurational transitions of Pr3+ ions are discussed.
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