Preparation of Sr2CeO4 Blue Phosphor Particles and Rare Earth (Eu, Ho, Tm, or Er)-Doped Sr2CeO4 Phosphor Particles, Using an Emulsion Liquid Membrane System
Preparation of Sr2CeO4 Blue Phosphor Particles and Rare Earth (Eu, Ho, Tm, or Er)-Doped Sr2CeO4 Phosphor Particles, Using an Emulsion Liquid Membrane System
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DOI：
10.1021/jp040220p
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发表时间：
2004-07
影响因子：
3.3
通讯作者：
T. Hirai;Y. Kawamura
中科院分区：
文献类型：
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作者：
T. Hirai;Y. Kawamura
采用乳状液膜(ELM)体系制备了Sr2CeO4蓝色荧光粉，该体系可作为微反应器用于制备尺寸和形貌可控的超细颗粒。在ELM体系中，用阳离子萃取剂(阳离子载体双(2-乙基己基)磷酸)将Sr2+和Ce3+从外水相中萃取出来，反萃取到含有草酸溶液的内水相中，形成亚微米级的复合草酸锶−Ce颗粒，比在均相水溶液中得到的颗粒小得多。在ELM系统中焙烧得到的前驱体草酸盐颗粒得到了亚微米级的Sr2CeO4颗粒，该颗粒在467 nm处显示出电荷转移(CT)发射(λex=254 nm)。研究了稀土掺杂的Sr2CeO4(Sr2CeO4：Ln3+；Ln=Eu，Ho，Tm，Er)的光致发光特性，得到了掺杂稀土离子对应的特征发射光谱。
Sr2CeO4 blue phosphor particles were prepared with an emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) system, which could be utilized as a microreactor for the preparation of size- and morphology-controlled fine particles. In the ELM system, Sr2+ and Ce3+ ions were extracted from the external water phase by extractant (cation carrier, bis(2-ethylhexyl)phosphoric acid) and were stripped into the internal water phase, containing oxalic acid solution, to form the submicrometer-sized composite Sr−Ce oxalate particles, which were much smaller than those obtained in a homogeneous aqueous solution. Calcination of the precursor oxalate particles obtained in the ELM system produced submicrometer-sized Sr2CeO4 particles, which showed a charge-transfer (CT) emission at 467 nm (λex = 254 nm). The photoluminescence properties of rare earth-doped Sr2CeO4 (Sr2CeO4:Ln3+; Ln = Eu, Ho, Tm, or Er) were also investigated, and the characteristic emissions corresponding to doped rare earth ions, effected...