Highly efficient blue‐emitting phosphor via charge compensation strategy and its application for white LED lighting

Abstract Highly efficient phosphors are indispensable for near‐ultraviolet (n‐UV) pumped white light emitting diodes (WLEDs). In this work, a novel blue emitting Sr 6 GdSc(BO 3 ) 6 :0.08Ce 3+ phosphor was synthesized, exhibiting a broadband blue emission (full width at half‐maximum (FWMH) = 133 nm) excited by 375 nm. Furthermore, the blue emission of Sr 6 GdSc(BO 3 ) 6 :0.08Ce 3+ was enhanced by 3.9 times through codoping Na + ions due to the influence of charge compensation and micromorphology and size of phosphor particles. At the same time, the internal quantum efficiency was improved from 45.4% to 98.6% and the external quantum efficiency up to 75.0%. Finally, the 365 nm excited two WLED devices were constructed by integrating Sr 6 GdSc(BO 3 ) 6 :0.08Ce 3+ , Sr 6 GdSc(BO 3 ) 6 :0.08Ce 3+ ,0.08Na + , commercial green and red phosphors with high color rendering index. These results reveal that the phosphors have prospective application in high‐quality warm white lighting.