Size-Tunable Solvothermal Synthesis of Zn2GeO4:Mn2 Nanophosphor in Water/Diethylene Glycol System
Size-Tunable Solvothermal Synthesis of Zn2GeO4:Mn2 Nanophosphor in Water/Diethylene Glycol System
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DOI：
10.1021/cg100753g
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发表时间：
2010-09
影响因子：
3.8
通讯作者：
Satoru Takeshita;J. Honda;T. Isobe;Tomohiro Sawayama;Seiji Niikura
中科院分区：
文献类型：
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作者：
Satoru Takeshita;J. Honda;T. Isobe;Tomohiro Sawayama;Seiji Niikura
以氧化锗和锌、锰(II)的醋酸盐为原料，在水和二甘醇(DEG)的混合溶剂中，于2 0 0℃下溶剂热反应2 h，制得了物相纯的Zn2GeO4：Mn2+纳米荧光粉，其中xDEG为二甘醇在混合溶剂中的体积分数.0≤xDEG≤91.7xDEG为混合溶剂中二甘醇的体积分数.随着xDEG含量的增加，颗粒尺寸和微晶尺寸减小。在xDEG=91.7下制备的样品由平均长度为30.2 nm、平均宽度为12.2 nm的纳米棒组成。X-射线荧光分析测得的实际锰浓度随着xDEG的增加而增加，并接近名义浓度2.0at%。样品在紫外光和近紫外光照射下表现出与Mn2+的d-−-d跃迁相对应的绿色发光。光致发光强度在∼为80℃左右达到最大值。这与竞争因素、锰的浓度以及微晶和颗粒的大小有关。
Zn2GeO4:Mn2+ nanophosphors are synthesized from germanium(IV) oxide and acetates of zinc and manganese(II) in a mixed solvent of water and diethylene glycol (DEG) by the solvothermal reaction at 200 °C for 2 h. Phase pure Zn2GeO4:Mn2+ is obtained for the samples prepared at 0 ≤ xDEG ≤ 91.7, where xDEG is the volume percentage of DEG in the mixed solvent. The particle and crystallite sizes decrease with the increase in xDEG. The sample prepared at xDEG = 91.7 comprises the nanorods with 30.2 and 12.2 nm in mean length and width, respectively. The actual Mn concentration measured by X-ray fluorescence analysis increases with the increase in xDEG and approaches to the nominal concentration, 2.0 at %. The samples show green luminescence corresponding to the d−d transition of Mn2+ under the irradiation of UV and near-UV light. The photoluminescence intensity reaches a maximum around xDEG ∼ 80. This is attributed to the competitive factors, the Mn concentration and the sizes of crystallites and particles.