A new fluorosilicoborate host for the development of Eu3+-activated red-emitting phosphors

• New red-emitting phosphor BaY6(Si3B6O24)F2:Eu3+ was developed.
• The phosphor has efficient absorption in the near-UV region.
• The phosphor shows efficient red–orange color with QE of 57%.
• BaY6(Si3B6O24)F2:Eu3+ has high thermal stability with an activation energy 0.31 eV.

Red-emitting phosphor of Eu3+-activated BaY6(Si3B6O24)F2 was synthesized by high-temperature solid state reaction. The phase purity was characterized by X-ray powder diffraction. Luminescent properties were characterized by photoluminescence excitation (PLE) and emission (PL) spectra, decay curves, and absolute quantum efficiency. The optimal doping concentration of Eu3+ in BaY6(Si3B6O24)F2: is about 30 mol%. This phosphor can be efficiently excited by near-ultraviolet light to realize reddish-orange color from the dominated 5D0→7F1 transition. In addition, the thermal stability was investigated according to the temperature-dependent PL spectra. Eu3+-doped BaY6(Si3B6O24)F2 has higher brightness and thermal stability, and shows a great potential for its application in LEDs as a suitable red-emitting phosphor.