Synthesis and photoluminescence characteristics of (Y,Gd)BO3:RE (RE=Eu3+, Ce3+, Dy3+ and Tb3+) phosphors for blue chip and near-UV white LEDs

A series of Eu3+-, Ce3+-, Dy3+- and Tb3+-doped (Y,Gd)BO3 phosphors was synthesized by a solid-state diffusion method. X-Ray diffraction confirmed their hexagonal structure and the scanning electron microscopy results showed crystalline particles. The excitation spectra revealed that (Y,Gd)BO3 phosphors doped with Eu3+, Ce3+ , Dy3+ and Tb3+ are effectively excited with near UV-light of 395nm/blue light, 364, 351 and 314nm, respectively. Photoluminescence spectra of Eu3+-, Ce3+- and Tb3+/Dy3+-doped phosphor showed intense emission of reddish orange, blue and white light, respectively. The phosphor Y0.60Gd0.38BO3:Ce-0.02 showed CIE 1931 color coordinates of (0.158, 0.031) and better color purity compared with commercially available blue BAM:Eu2+ phosphor. The phosphor (Y,Gd)BO3 doped with Eu3+, Dy3+ and Tb3+ showed CIE 1931 color coordinates of (0.667, 0.332), (0.251, 0.299) and (0.333, 0.391) respectively. Significant photoluminescence characteristics of the prepared phosphors indicate that they might serve as potential candidates for blue chip and near-UV white light-emitting diode applications. Copyright (c) 2015 John Wiley & Sons, Ltd.