Synthesis and calcination temperature dependent photoluminescence properties of novel bromosilicate phosphors

摘要

Novel Eu~(2+)-doped bromosilicate phosphors, (CaO-CaBr_2-SiO_2):0.03Eu~(2+), were prepared by the traditional solid-state method under a different calcination temperature. The as-prepared (CaO-CaBr_2-SiO_2):0.03Eu~(2+) phosphors obtained under various reaction temperatures all indicated a broad excitation in the near ultraviolet region (350-450 nm). The phosphor system exhibits bluish-green light with a peak wavelength at 498 nm when the calcination temperature is below 800 ℃. while it shows a strong blue emission light with a peak wavelength at 474 nm as the calcination temperature is above 800 ℃, and it also gives an interesting greenish-yellow long-lasting phosphorescence with a peak wavelength at 540 nm in the dark.