Abstract
A series of Er3+, Sm3+ and Er3+/Sm3+ codoped BaGdF5 nanocrystalline phosphors have been successfully synthesised by hydrothermal synthesis. Uniformly distributed nanocrystals with a spherical morphology and particle size of 30–40 nm were observed. X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence and decay studies were employed to characterise the samples. Under the 382 nm radiation excitation, the BaGdF5:Er3+ samples exhibit the typical green emission band of the Er3+ ions. With increasing the Sm3+ doped concentration, the highly intense orange–red emission bands of the Sm3+ ions were attributed to the effective energy transfer from the Er3+ to the Sm3+ ions, which has been justified through the luminescence spectra and the fluorescence decay dynamics.
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