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 Sr6GdSc(BO3)6:0.08Ce3+ 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)6:0.08Ce3+ 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)6:0.08Ce3+, Sr6GdSc(BO3)6:0.08Ce3+,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.

An efficient blue–violet phosphor: an advanced material designed for high-quality full-spectrum lighting

“…To explore the correlation between the different Ce 3+ -luminescence and host sites, their relationship is assessed using the Van Uitert empirical equation: 27–29 where E represents the position of the emission peak position of the Ce 3+ ion; Q * denotes the lowest d-band edge energy of the free Ce 3+ ion ( Q = 50 000 cm −1 ), and V means the valence of the Ce 3+ ion ( V = 3). E a stands for the electron affinity related to the formation of the anion, and it is regarded as a constant within the same matrix.…”