摘 要: 以 Y₂O₃, Gd₂O₃, Ce(NO₃)₃·6H₂O, Al(NO₃)₃·9H₂O 为原料, 采用 微波均相沉淀法制备了 Ce:(Y, Gd)₃Al₅O₁₂ 前驱体, 经 1 100 ℃煅烧得 到粒径在 100 nm 左右的近球形粉体。测试结果表明: 该粉具有良好的 荧光性能, 呈现宽带激发和宽带发射, 激发主峰在 456 nm, 半高宽约 为 60 nm, 在 460 nm 入射光的激发下, 发射峰在 566 nm 左右, 半高宽 约为 125 nm。由于 Gd³⁺ 的掺入改变了基体的晶场结构, 致使发射光谱 发生了红移。 

关键词: 微波均相沉淀法; 荧光粉; 激发光谱; 发射光谱

Abstract: The Ce:(Y, Gd)₃Al₅O₁₂ precursor was prepared by homoge neous precipitation under microwave irradiation using Y₂O₃, Gd₂O₃, Ce (NO₃)₃·6H₂O, Al (NO₃)₃·9H₂O as raw materials. The XRD patterns show pure YAG crystallized phase was obtained at 1 100℃for 2h. Basi cally spherical Ce:(Y, Gd)₃Al₅O₁₂ powders were indicated from TEM im ages, and the size of the particles was about 100 nm. The broad excitation band and emission band can be seen from the excitation and emission spectrum. The excitation band is located at 456 nm and the full-width of half-maximum is 60 nm. The emission band is located at 566 nm and the full-width of half-maximum is 125 nm. It was found that red shift occurs in the emission band because parts of Y³⁺ were replaced by Gd³⁺. 

Keywords: microwave homogenous precipitation; phosphor; excita tion spectrum; emission spectrum