Abstract
A new red-emitting phosphor Ca 9Lu(PO 4) 7:Ce 3+, Mn 2+ has been synthesized by solid-state reaction, and its luminescence properties have been investigated. The broad red emission peaked at 645 nm of Mn 2+ is greatly enhanced by the sensitizer Ce 3+ due to efficient energy transfer from Ce 3+ to Mn 2+. The energy transfer was demonstrated to belong to a resonant type via a dipole–quadrupole mechanism. The critical distance for Ce 3+→Mn 2+ energy transfer was calculated to be 15.04 Å by concentration quenching method. Preliminary results indicate that the phosphor might be a promising red phosphor for UV-based white LEDs.
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