Structural and luminescent properties of cerium-ion doped barium borophosphates

摘要

The effects of synthesis conditions on the luminescence characteristics of Ce~(3+) in barium borophosphate phosphors are investigated in the present study. Synthesis of cerium-ion doped BaBPO_5 in the oxidizing atmosphere results in partial reduction of Ce~(4+) to Ce~(3+) . The dominant emission at 320 nm arises due to Ce~(3+) located at Ba~(2+) sites without local charge compensation; while, the relatively weak emission at 380 nm is ascribed to Ce~(3+) substituting atBa~(2+) sites in association with charge compensatory vacancy. The complete reduction of Ce~(4+) to Ce~(3+) occurs for the samples heated in the reducing atmosphere. The increased luminescence of BaBPO_5 codoped with cerium and sodium ions is attributed to the reduction in non-radiative energy transfer.