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Complete phase transition from hexagonal LnF3 (Ln3+ = La3+, Ce3+, Pr3+) to monodisperse ultrasmall (∼7 nm) cubic Ln0.8M0.2F2.8 (M2+ = Ca2+, Sr2+, Ba2+) disordered solid solution nanocubes was successfully achieved through alkaline-earth doping, which induced great intensification of the near-infrared to visible upconversion emissions of the optically active rare earth ions.
