关键词: BaAl₂S₄Eu²⁺, 光致发光, 电致发光, 纳米粒子

Abstract: BaAl₂S₄:Eu²⁺ nanoparticles with a size distribution of 50—150 nm were prepared by the sol-gel method. The particles were near spherical and had an intensive green emission when they were excited at 254 nm, after calcining at 1000 ℃ in a mixture of H₂S(volume fraction 10%)+N₂(volume fraction 90%) for 1.5 h. X-ray diffraction patterns indicate that BaAl₂S₄:Eu²⁺ has a cubic structure. The emission and excitation spectra show that emission was from the 4f⁶5d→4f⁷ transition of the activated Eu²⁺. The highest photoluminescence(PL) luminance is 420 cd/m². This study indicate that the BaAl₂S₄:Eu²⁺ could be used as photoluminescent nanocomposite materials.

Key words: BaAl₂S₄Eu²⁺, Photoluminescence, Electroluminescence, Nanoparticle