Efficient Chemical Synthesis of Functional Rare Earth Orthoborates Nanosheets and Their Photoluminescence Studies

: In contrast to routine methods, La x Y1−x BO3:Eu3+ and La y Lu1−y BO3:Eu3+ were efficiently prepared by a supersonic microwave co-assistance method within 60 minutes at 90 °C. Orderly aggregated nanosheets were formed in high yields by preferential crystal growth processes. More importantly, it has never been reported that the magnetic-dipole transition with orange-color emissions (5D0 → 7F1) could be finely tuned based on the concentration variation of lanthanum elements. The electronic dipole transition (5D0 → 7F2) increases gradually when La/Y and La/Lu ratios are 4/1 and 7/3 respectively.