Abstract
Eu 3+-doped transparent nanocomposite of SiO 2–Al 2O 3–NaF–LaF 3 was fabricated by melt-quenching and subsequent heating. X-ray diffraction and transmission electron microscopy analyses evidenced that hexagonal LaF 3 nanocrystals were homogeneously precipitated among the aluminosilicate glass matrix. The distribution of Eu 3+ ions in the nanocomposite was investigated by energy dispersive X-ray spectroscopy, photoluminescence and time-resolved luminescence spectra. The nanocomposite exhibited intense blue and green emissions originating from the 5D 1,2,3 levels of Eu 3+ incorporated in the low-phonon-energy LaF 3 nanocrystals, and red emission corresponding to the Eu 3+: 5D 0 → 7F J ( J = 0, 1, 2, 3, 4) transitions, under the excitation of single wavelength light at 394 nm. By adjusting the Eu 3+ doping content, various luminescent colors, including perfect white light, were easily tuned through cross relaxation processes between Eu 3+ ions. The results suggest that the Eu 3+-doped transparent nanocomposite could be potentially applicable as a white-light-emitting material under UV chip excitation.
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