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The use of rare-earth (RE) (e.g., Eu²⁺/Ce³⁺) ions as single luminescent centers in phosphors with tailorable emission properties has been extensively studied for their potential use in white LEDs. However, significant limitations remain, in particular, for red-emitting phosphors due to the inherently broad excitation bands which result from the underlying d–f transitions and span large parts of the visible spectral region. Guided by density functional theory calculations on the ligand structure of the non-RE Bi³⁺ ion, we report here on an alternative class of phosphors, [(Y,Sc)(Nb,V)O₄:Bi³⁺], which exhibit homogeneous Bi³⁺ luminescence. In these materials, adjustment of the cation fractions enables dedicated tailoring of the excitation scheme within the spectral range of ∼340–420 nm and, in the meanwhile, allows for tunable emission spanning from about 450 nm (blue) to 647 nm (orange-red). The practical absence of …