Synthesis and Luminescence Properties of Pr³⁺-Doped BiPO₄ Polycrystals

Abstract

The results of synthesis, crystal structure characterization and luminescence properties study of the Pr 3+-doped bismuth orthophosphate, BiPO4, polycrystals are reported. It was found that doping of bismuth orthophosphate with praseodymium of concentration more than 1% leads to phase transition of BiPO4 from so-called "hightemperature monoclinic" to "low-temperature monoclinic" structure. At room temperature studied samples revealed intensive red luminescence caused by radiation electronic transitions in the Pr 3+ ions under their intrinsic f → f excitation at 3 H4 → 3 P1 + 1 I6 absorption transition. Influence of phase transformation as well as multi-phonon and cross-relaxation processes on the luminescence of the Pr 3+-doped BiPO4 compounds were discussed.

Characterization of Micro‐ and Nanoscale LuPO4:Pr3+,Nd3+ with Strong UV‐C Emission to Reduce X‐Ray Doses in Radiation Therapy

“…Several studies have observed that the emission of the 1 D 2 → 3 H 4 transition of Pr 3+ disappears upon increasing the Pr 3+ concentration . In this case, the Pr 3+ concentration was kept at 1% in all samples.…”

“…However, a reduced intensity of the peaks observed at around 600 nm can be clearly recognized (inset). These peaks have been attributed to the 1 D 2 → 3 H 4 and 3 P 0 → 3 H 6 transitions of the Pr 3+ ion …”