Synthesis and photoluminescence of highly enhanced green-emitting LaNbTiO6:xEr3+, yBi3+ micro/nanophosphors

In this paper, we provided a new green-emitting LaNbTiO6:xEr3+, yBi3+ micro/nanophosphors with good photoluminescence (PL) performance synthesized by a modified sol–gel combustion method for the first time. Down-converted luminescence from Er3+, Bi3+ co-doped into the LaNbTiO6 host was observed under UV light excitation, in which the strongest emission peaks centered at 525 and 548 nm are attributed to the 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of Er3+, respectively. The greatly enhanced luminescence of LaNbTiO6:xEr3+, yBi3+ phosphors can be derived from the effective Bi3+ → Er3+ energy transfer process, of which the mechanism is mainly related to the exchange interaction. CIE chromaticity coordinates for LaNbTiO6:xEr3+, yBi3+ phosphors could be tunable in green spectral region by controlling the concentration of Bi3+ ions. It is also affirmed from the high brightness fluorescence images that LaNbTiO6:xEr3+, yBi3+ phosphors could be the promising candidates for use in white LEDs application.

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► New highly enhanced green-emitting LaNbTiO6:xEr3+, yBi3+ micro/nanophosphors were obtained.
► The effective Bi3+ → Er3+ energy transfer in LaNbTiO6:xEr3+, yBi3+ phosphors was found.
► The particle size of phosphors can be controlled.
► CIE chromaticity coordinates can be tunable.