Liang-Jun Yin
University of Electronic Science and Technology of China
China
Title: A novel way to prepare Eu2+ doped Y-Si-O-N based phosphor
Biography
Biography: Liang-Jun Yin
Abstract
A novel Y4Si2O7N2: Eu2+ phosphor has been successfully synthesized by an interesting pretreatment method of using HI. Without HI, The appearance of Eu doped Y4Si2O7N2 (YSiON: Eu) is yellow and become darken with the higher concentration of Eu. Unfortunately, no emission is found in the YSiON: Eu. Amazingly, with the use of HI, Y4Si2O7N2: Eu2+ (YSiON: Eu, HI) turns white and basically unchanged with the concentration of Eu. The produced YSiON: Eu, HI phosphor shows a broad emission band in the range of 400–550 nm with a peak at 440 nm. Thus, there must be large difference between YSiON: Eu and YSiON: Eu, HI. The use of HI effectively promote the reduction of Eu3+ to Eu2+ ions in Y4Si2O7N2 crystal lattice, confirmed by PL spectra, absorption spectra and X-ray absorption near-edge structure (XANES) analysis .