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

Site-selective occupation generated by ion doping into crystal lattices is an effective way to explore new matter and regulate luminescent properties. Herein, equiv. M2+ (Ca, Sr, Ba) is partially replaced each other to formulate multiple doped sites in Li2MSiO4: Eu2+ (LMSO: Eu2+). As the luminescence center, Eu2+ 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: Eu2+ (M = Ca, Sr, Ba) exhibits great X-ray imaging ability, the detection limit of X-ray reaches 0.18, 0.075, and 0.12 mu Gy s(-1). This work presents great potentiality of synthesized phosphors in the fields of solid-state lighting and X-ray imaging. image