A white LED with orange-red phosphors KBaBP2O8:Eu3+

A series of phosphors K1+xBa1-2xBP2O8:xEu3+ (x = 0.04, 0.06, 0.08, 0.10, 0.12) were prepared by a simple solidstate reaction and the reaction process was carried out in the atmosphere. The phase composition and structure, sample morphology, luminescence performance, and thermal stability of K1+xBa1-2xBP2O8:xEu3+ were investigated by X-ray powder diffraction (XRD), scanning electron microscopic (SEM), and fluorescence spectrophotometer (PL). The XRD results indicate that the K1+xBa1-2xBP2O8:xEu3+ possessed the pure tetragonal system structure with a space group of I42d. The excitation and emission spectra manifest that these phosphors can be effectively excited by the near-ultraviolet light, and exhibit an orange-red emission corresponding to the 5D0?7FJ (J = 1, 2) transitions of Eu3+. The optimum doping concentration of Eu3+ ions in K1+xBa1-2xBP2O8:xEu3+ was x = 0.10. The concentration quenching mechanism between the Eu3+ ions was determined as the dipole?dipole interaction host and the critical distance was procured to be 19.21 ?. The phosphors performed excellent properties between the temperature increased from 25 ?C to 225 ?C, and may become an orange-red phosphor with great potential in the lighting field.

Automated summary

A series of phosphors K1+xBa1-2xBP2O8:xEu3+ were prepared and analyzed for their luminescence properties and thermal stability through XRD, SEM, and PL, showing excellent performance with Eu3+ at x=0.10 being the optimal doping concentration.