Synthesis and luminescence properties of a novel red-emitting LiSr4(BN2)(3):Eu2+ phosphor

摘要

A near-UV excited phosphor, LiSr4(BN2)(3):Eu2+ (LSBN:Eu2+), was synthesized using a solid-state reaction at 800 degrees C. The crystal structure of LSBN had been refined and determined from the XRD profiles by the Rietveld refinement method, which belongs to the space group Im (3) over barm with the lattice constants a = b = c = 7.46112(23) angstrom. The excitation spectra of the LSBN: Eu2+ phosphors were centered at around 370 nm and covered the range from 300 to 450 nm. Under 400 nm excitation, the emission spectra of the LSBN: Eu2+ phosphors show a red emission centered at about 640 nm (FWHM approximate to 130 nm). And the energy transfer between the Eu2+ ions is confirmed to arise from the electric dipole-dipole interactions. The nontypical emission blue-shift in the single luminescence center with increasing temperature luminescence properties is also investigated. The results indicate that LSBN: Eu2+ could be conducive to the development of white light emitting diodes.