Luminescence Properties of Green-Emitting Phosphor (Ba_(1-x),Sr_x)_2SiO_4 ∶Eu~(2+) for White LEDS

摘要

The (Ba_(1-x)Sr_x)_2SiO_4∶Eu~(2+) green-emitting phosphors were synthesized by conventional solid-state reaction in a CO-reductive atmosphere, and their luminescent properties were investigated. The XRD data show that the Ba/Sr ratio not only affects the lattice parameters, but also influences the emission peak. The excitation spectra indicate that this phosphor can be effectively excited by UV light from 370 to 470 nm. The emission band is due to the 4f~65d~1→4f~7 transition of the Eu~(2+) ion. With an increase in x , the emission band shifts to longer wavelength and the reason was discussed. The emission spectra exhibit a satisfactory green performance under different excitation wavelength(380, 398, 412, 420, 460 nm) . (Ba_(1-x)Sr_x)_2SiO_4∶Eu~(2+) is a promising phosphor for green white-lighting-emission diode by ultraviolet chip.