期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 111, 期 1, 页码 168-174出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp064655j
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Y2SiO5: Eu3+ and Gd-9.33(SiO4)(6)O-2: Eu3+ red phosphor particles were prepared using an emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) system, which could be utilized as a microreactor for precipitation reaction of rare earth oxalate and hydrolysis-condensation reaction of Si alkoxide, to obtain size-and morphology-controlled precursor particles. Y3+ (or Gd3+) and Eu3+ ions were extracted from the external water phase of the ELM system by extractant (cation carrier, 2-methyl-2-ethylheptanoic acid) and were stripped into the internal water phase, consisting of oxalic acid and tetramethyl orthosilicate (TMOS) as the Si source, to make composite Y-Eu-Si (or Gd-Eu-Si) oxalate particles. The precursor particles were 20-60 nm in size, containing small amounts of flat particles of 300 nm in size. By calcination of the precursor oxalate particles obtained in the ELM system, submicrometer-sized X-1-phase Y2SiO5: Eu3+ (or Gd-9.33(SiO4)(6)O-2: Eu3+) particles were produced, which were smaller than those prepared by the conventional sol-gel method. The resulting phosphor particles demonstrated a photoluminescence around 600 nm (lambda(ex)) 254 nm). Photoluminescence properties of Tb3+-or Sm3+-doped Y2SiO5 and Gd-9.33(SiO4)(6)O-2: Tb3+ particles were also investigated, and the characteristic photoluminescence corresponding to doped rare earth ions was observed.
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