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

Highly efficient phosphors are indispensable for near-ultraviolet (n-UV) pumped white light emitting diodes (WLEDs). In this work, a novel blue emitting Sr6GdSc(BO3)(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 Sr6GdSc(BO3)(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 Sr6GdSc(BO3)(6):0.08Ce(3+), Sr6GdSc(BO3)(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.