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

Abstract

A series of phosphors K1+xBa1-2xBP2O8:xEu3+ (x = 0.04, 0.06, 0.08, 0.10, 0.12) were prepared by a simple solid-state 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 I4¯2d. 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 Å. 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.