Structural and luminescent properties of cerium-ion doped barium borophosphates
2006
Lu, Chung-Hsin | Godbole, S. V. | Naṭarājan̲, V.
The effects of synthesis conditions on the luminescence characteristics of Ce³⁺ in barium borophosphate phosphors are investigated in the present study. Synthesis of cerium-ion doped BaBPO₅ in the oxidizing atmosphere results in partial reduction of Ce⁴⁺ to Ce³⁺. The dominant emission at 320 nm arises due to Ce³⁺ located at Ba²⁺ sites without local charge compensation; while, the relatively weak emission at 380 nm is ascribed to Ce³⁺ substituting at Ba²⁺ sites in association with charge compensatory vacancy. The complete reduction of Ce⁴⁺ to Ce³⁺ occurs for the samples heated in the reducing atmosphere. The increased luminescence of BaBPO₅ codoped with cerium and sodium ions is attributed to the reduction in non-radiative energy transfer.
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