Color‐Tunable Emission via Site‐Selective Occupation of Eu2+ Activators in Silicate Phosphors

Abstract Site‐selective occupation generated by ion doping into crystal lattices is an effective way to explore new matter and regulate luminescent properties. Herein, equiv. M 2+ (Ca, Sr, Ba) is partially replaced each other to formulate multiple doped sites in Li 2 MSiO 4 : Eu 2+ (LMSO: Eu 2+ ). As the luminescence center, Eu 2+ selectively occupies different sites to regulate luminescent color in the visible spectrum ranging from blue to orange, and ultimately functionality improvement. The Huang‐Rhys factor is quite small and the resulting phosphors display an ultrahigh thermal stability for optical thermometry. Besides, utilizing synthesized phosphors combined with the InGaN chip generates high‐quality full‐spectrum white light. Under X‐ray irradiation, LMSO: Eu 2+ (M = Ca, Sr, Ba) exhibits great X‐ray imaging ability, the detection limit of X‐ray reaches 0.18, 0.075, and 0.12 µGy s −1 . This work presents great potentiality of synthesized phosphors in the fields of solid‐state lighting and X‐ray imaging.