Hirai Takayuki, Kawamura Yusuke
Research Center for Solar Energy Chemistry, Osaka University, Toyonaka, Osaka 560-8531, Japan.
J Phys Chem B. 2005 Mar 31;109(12):5569-73. doi: 10.1021/jp045390g.
Sr(2)CeO(4) and Sr(2)CeO(4):Eu(3+),Dy(3+) phosphor particles and thin films were prepared by using an emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) system, containing VA-10 (2-methyl-2-ethylheptanoic acid) as extractant (cation carrier). A two-step extraction enabled efficient extraction for Sr(3+) and rare earth ions, and the resulting precursor metal oxalate particles produced in the internal water phase of the ELM system were about 60 nm in diameter. Calcination of the oxalate particles in air gave submicrometer-sized Sr(2)CeO(4) and Sr(2)CeO(4):Eu(3+),Dy(3+) particles, which showed blue and white luminescence, respectively, by UV excitation. Blue and white luminescence phosphor thin films were also prepared by soaking alumina substrates into the W/O emulsion containing precursor oxalate particles, followed by calcination in air.
采用乳液液膜（ELM，水包油包水（W/O/W）乳液）体系制备了Sr(2)CeO(4)以及Sr(2)CeO(4):Eu(3+),Dy(3+)荧光粉颗粒和薄膜，该体系含有VA-10（2-甲基-2-乙基庚酸）作为萃取剂（阳离子载体）。两步萃取能够有效萃取Sr(3+)和稀土离子，在ELM体系内水相中生成的前驱体金属草酸盐颗粒直径约为60 nm。在空气中煅烧草酸盐颗粒得到亚微米级的Sr(2)CeO(4)和Sr(2)CeO(4):Eu(3+),Dy(3+)颗粒，通过紫外线激发分别呈现蓝色和白色发光。还通过将氧化铝基板浸泡在含有前驱体草酸盐颗粒的W/O乳液中，然后在空气中煅烧，制备了蓝色和白色发光的荧光粉薄膜。
