摘要
Single-component, single-activator-converted high-color-rendering index (CRI) white-light phosphors have sparked much interest for phosphor-converted white light-emitting diodes. However, manipulating the distribution and locations of single activators to target desired sites in a given host lattice is still a challenge. Herein, we report the remote regulation of the distribution of Eu 2+ ions by engineering and controlling the structural ordering in Sr 3 (Ce 1−x La x )(PO 4 ) 3 :0.05Eu 2+ (SCLP:Eu 2+ ) compound, which are designed by using two-color phosphors with different anionic structural ordering, viz., Sr 3 Ce(PO 4 ) 3 :Eu 2+ (yellow) with disordered state of PO 4 tetrahedra, and Sr 3 La(PO 4 ) 3 :Eu 2+ (blue) with ordered state of PO 4 tetrahedra. The successive substitution of Ce by La triggers a pronounced disorder-to-order structural transformation of PO 4 tetrahedra within SCLP:Eu 2+ compounds and guides remotely the distribution of Eu 2+ activators, which is demonstrated by a detailed analysis of synchrotron X-ray diffraction refinement, electron paramagnetic resonance spectra, electron spin-echo envelope modulation spectra, Raman spectra, nuclear magnetic resonance spectra and micro-cathodoluminescence spectrum. Benefitting from the controllable structural ordering transformation, as-prepared samples form a unique disorder-order crystal structure, exhibiting controllable microstructure acting on Eu 2+ ions, tunable-color emissions including a high CRI (Ra = 90) white-light, increased structural rigidity and thermal stability. These interesting findings in the local structure-dependent luminescence properties demonstrate that structural ordering engineering may be an effective approach to regulate the migration of Eu 2+ activators and improve the thermal stability of phosphors.