A Novel Yellow Phosphor(Ba₃Sc₂(BO₃)₄: Eu²⁺) Suitable for Full‐Spectrum Lighting, Featuring Tunable Photoluminescence and Enhanced Luminous Thermal Stability

Abstract Currently, the development of phosphors for full‐spectrum lighting is a prominent research area in the field of illumination. In this study, a novel and highly efficient yellow phosphor (Ba 3 Sc 2 (BO 3 ) 4 : Eu 2+ , BSBO: Eu 2+ ) is synthesized via the high‐temperature solid‐phase method for the first time. The excitation spectrum of this phosphor ranges from 225 to 480 nm, with a peak at 365 nm. The emission spectrum ranges from 450 to 720 nm, peaking at 555 nm, with a full width at half maximum ( FWHM ) of 113 nm. BSBO: Eu 2+ shows outstanding quantum efficiencies (IQE = 94.3%, EQE = 33.3%). The emission spectrum and luminescent color can be tuned through cation substitution. The thermal stability of BSBO: Eu 2+ is significantly enhanced by the partial replacement of Sc ions with smaller Al and Ga ions. To illustrate its practical application potential in full‐spectrum lighting, BSBO: Eu 2+ is combined with commercially available blue and red phosphors, resulting in a WLED warm light source with an outstanding color rendering index ( R a) of 94.4% and a correlated color temperature (CCT) of 3865 K. These results highlight the substantial potential of BSBO: Eu 2+ in full‐spectrum lighting applications.