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Erschienen in:
01.06.2014
Synthesis and luminescence of BiPO4:Ln3+ (Ln = Ce3+, Tb3+) phosphors
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 6/2014
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Abstract
BiPO4:Ce3+ and BiPO4:(Ce3+, Tb3+) powders were synthesized by the method of precipitation. The X-ray diffraction patterns show that BiPO4:Ce3+ and BiPO4:(Ce3+, Tb3+) samples have pure hexagonal phases. The transmission electron microscopy results show that the synthesized samples are nanoparticles. Ethylene glycol plays an important role in the formation of nanoparticles. The excitation spectrum of BiPO4:Ce3+ sample shows the transition from the ground 2
F
5/2 state to the excited 5d states of the Ce3+ ions. The emission spectrum exhibits a strong band centered at 352 nm originating from the 5d → 4f transitions of the Ce3+ ions. The emission spectrum of the BiPO4:(Ce3+, Tb3+) sample contains both a weak emission band of the Ce3+ ions and strong green emission bands of the Tb3+ ions. The excitation and emission spectra show that there are energy transfers between Ce3+ and Tb3+ ions in the BiPO4:(Ce3+, Tb3+) sample. The energy transfers between Ce3+ and Tb3+ ions improve the emission efficiency of BiPO4:(Ce3+, Tb3+) sample.