The luminescence of three orthoborates: LuBO 3 with calcite and vaterite structures and vaterite YBO 3 doped with Pr 3+ ions has been investigated. The intense broad bands observed in the emission and excitation spectra were attributed to Pr 3 4f5d↔4f 2 transitions. The emission was ascribed to four spinallowed transitions and one spin-forbidden from the lowest 4f5d level to 4f 2 configuration multiplets. Two additional broad emission bands with very weak intensity at 440 and 580 nm were studied. Evidence of the presence of Ce 3+ traces is reported and their influence on Pr 3+ luminescence is discussed.
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