Photoluminescence Tuning of Stable CaYGaO: Bi/Eu via Compositional Modulation and Crystallographic Site Engineering for nUV wLEDs.

The olivine-based gallate CaYGaO (CYG) with unique cationic ordering, rich lattice sites, and self-photoluminescence (PL) is suitable for application as a host of phosphor. However, research in this area is still in its early stages, especially in high-quality full-spectrum white lighting. Herein, novel CYG: Bi/Eu with a controllable PL property is designed based on energy transfer and superposition of emissions from blue self-PL, blue PL of Bi, and red-PL of Eu.