Synthesis and photoluminescence properties of green-emitting Ba ₃Si ₆O ₁₂N ₂ oxynitride phosphor using boron-coated Eu ₂O ₃ for white LED applications

Highly efficient Ba ₃Si ₆O ₁₂N ₂ green-emitting phosphors using boron-coated Eu ₂O ₃ were synthesized by a gas reduction nitridation method under flowing NH ₃ gas. X-ray diffraction patterns showed that the synthesized phosphor was a pure phase of Ba ₃Si ₆O ₁₂N ₂. The Ba ₃Si ₆O ₁₂N ₂ green-emitting phosphors synthesized by modification of an alumina boat were crystallized much better as well as showed higher emission intensity. The emission spectra showed a typically broad green emission band attributed to the 4f ⁶5d → 4f ⁷ electronic transition of Eu ²⁺ ions under excitation at 405 nm. The green-emitting Ba ₃Si ₆O ₁₂N ₂ phosphors that were synthesized using boron-coated Eu ₂O ₃ by modification of an alumina boat could be applied to generate white light emitting diodes.