We report the successful incorporation of ions into nanocrystals via a solvothermal method, with a resulting concentration of the order of . Upon excitation above the bandgap at 300 nm, intense and well-resolved -related photoluminescence (PL) at was observed at room temperature. The results of PL excitation and ultraviolet/visible diffuse reflectance spectra indicate that the excitation is a carrier-mediated process with an energy transfer from the host to . For the above-gap excitation, only a single type of luminescence center located at a centrosymmetric site was identified. The near-infrared luminescence dynamics and the weak PL thermal quenching of were also revealed.
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