Europium doped lanthanum zirconate nanoparticles with high concentration quenching

• Eu:La2Zr2O7 nanoparticles were prepared facilely by a kinetically modified molten salt method.
• High color purity and concentration quenching were achieved in these La2Zr2O7:Eu nanoparticles.
• Concentration quenching mechanism was discussed for Eu3+ in these Eu:La2Zr2O7 nanoparticles.

A series of Eu3+ doped lanthanum zirconate (La2Zr2O7) nanoparticles (NPs, 20 ± 5 nm in diameter) with cubic fluorite structure were facilely synthesized by a kinetically modified molten salt synthetic (MSS) process and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and photoluminescence spectra (PL). Under the excitation of 405 nm, intense red emission with high color purity can be observed in the Eu3+ doped La2Zr2O7 NPs. Moreover, the as-prepared Eu:La2Zr2O7 NPs possess high concentration quenching, which is as high as ∼32.5 mol% of europium dopants in the La2Zr2O7 host. The corresponding concentration quenching mechanism was discussed as well. Our results confirm that the kinetically modified MSS process is a promising approach for preparing rare earth (RE) ions doped A2B2O7 nanoparticles with uniform RE doping and high concentration quenching.

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