Red/blue-shift dual-directional regulation of α ′L-(Ca, Sr)2SiO4:Eu2+ phosphors resulting from the incorporation content of Eu2+/Sr2+ ions

Abstract

In this work, tunable emission from green to red and the inverse tuning from red to green in α^′_L-(Ca, Sr)₂SiO₄:Eu²⁺ phosphors were demonstrated magically by varying the incorporation content of Eu²⁺ and Sr²⁺ ions, respectively. The tunable emission properties and the tuning mechanism of red-shift resulting from the Eu²⁺ content as well as that of blue-shift induced by the Sr²⁺ content were investigated in detail. As a result of fine-controlling the incorporation content of Eu²⁺, the emission peak red-shifts from 541 nm to 640 nm. On the other hand, the emission peak inversely blue-shifts from 640 nm to 546 nm through fine-adjusting the incorporation content of Sr²⁺. The excellent tuning characteristics for α^′_L-(Ca, Sr)₂SiO₄:Eu²⁺ phosphors presented in this work exhibited their various application prospects in solid-state lighting combining with a blue chip or a near-UV chip.