Abstract
Novel red phosphors R3P4O13:Bi2+ (R = Sr and Ba) are synthesized by solid state reaction method in air, and their crystal structures and fluorescence properties are characterized. The excitation bands peaking at ∼440 nm match with the blue LED chip, and their red emission band peaking at ∼658 and 686 nm within the range 580–800 nm owing to 2P3/2(1) → 2P1/2 the transition of Bi2+ ions can be observed, respectively. The relation between Bi2+ doping concentration and emission intensity is discussed and the optimal Bi2+ ion doping concentration is ∼3.0 mol%. Decay curves and time-resolved spectra confirm that R3P4O13:Bi2+ (R = Sr and Ba) phosphors have only single Bi2+ center. The luminous mechanism is explained by energy level diagram of Bi2+. The luminescence properties indicate that R3P4O13:Bi2+ (R = Sr and Ba) phosphors have a potential to be used as red emitting phosphor candidate for white LEDs based on ∼440 nm blue LED chip.
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