Herein, we report the photoluminescence properties of Bi-sensitized BaYF5:10 mol%Eu nanoparticles. The emission spectra feature Eu peaks corresponding to transitions from the D0 excited to FJ (J = 1, 2, 3, 4) lower levels with two dominant emissions positioned in the orange-red (∼ 592 nm, D0 → F1) and deep-red (∼ 697 nm, D0 → F4) regions. Upon 265 nm excitation, the emission intensity increases with an increase of Bi concentration up to 20 mol%. Due to the energy transfer from Bi to Eu ions, the integrated intensity of Eu emission in the Bi co-doped BaYF5:10 mol%Eu is 216% stronger than in the Bi-free sample. Our findings demonstrated that BaYF5:Eu,Bi has potential in plant lighting technology due to strong emission in red and deep-red spectral areas.
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