Synthesis and photoluminescence properties of Sm3+-doped CaWO4 nanoparticles
Synthesis and photoluminescence properties of Sm3+-doped CaWO4 nanoparticles
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DOI：
10.1016/j.jlumin.2010.02.001
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发表时间：
2010-06
影响因子：
3.6
通讯作者：
Q. Xiao;Qitao Zhou;Ming Li
中科院分区：
文献类型：
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作者：
Q. Xiao;Qitao Zhou;Ming Li
采用水热法制备了Sm{sup 3+}掺杂的CaWO{sup 4}纳米粒子。研究了Sm{sup 3+}掺杂不同Sm{sup 3+}浓度的CaWO{sub 4}纳米粒子在405 nm激发下的室温光致发光光谱。发光光谱在460、571、609和653nm处有4个强发射峰。在460 nm处的第一个发射峰可能是由于晶格的结构缺陷，一个缺氧的WO{sub 3}配合物。在571、609和653nm处的另外三个发射是由Sm{sup 3+}的4f电子的f-f禁跃迁引起的，分别对应于{sup 4}G{sub 5/2}->{sup 6}H{sub 7/2} （571 nm）、{sup 6}H{sub 7/2} （609 nm）和{sup 6}H{sub 9/2} （653 nm）。此外，还确定了CaWO{sub 4}纳米粒子中Sm{sup 3+}的最佳浓度为1.0%。Sm{sup 3+}掺杂CaWO{sup 4}纳米粒子的Sm{sup 3+4}G{sup 5/2}->{sup 6}H{sup 7/2} （609 nm）发射强度随着Sm{sup 3+}掺杂浓度的增加而显著增加，并在Sm{sup 3+}掺杂量为1.0%时达到最大值。如果Sm{sup 3+}浓度继续增加，即超过1.0%，则Sm{sup 3+4}G{sub 5/2}->{sup 6}H{sub 7/2}的排放强度降低。该材料有望成为白光LED应用的理想荧光粉。
The Sm{sup 3+}-doped CaWO{sub 4} nanoparticles were synthesized by hydrothermal method. The room temperature photoluminescence (PL) spectra of Sm{sup 3+}-doped CaWO{sub 4} nanoparticles doped with different Sm{sup 3+} concentrations under 405 nm excitation have been investigated. The PL spectra showed four strong emission peaks at 460, 571, 609, and 653 nm. The first emission peak at 460 nm could be due to a structural defect of the lattice, an oxygen-deficient WO{sub 3} complex. The other three emissions at 571, 609, and 653 nm were due to the f-f forbidden transitions of the 4f electrons of Sm{sup 3+}, corresponding to {sup 4}G{sub 5/2}->{sup 6}H{sub 5/2} (571 nm), {sup 6}H{sub 7/2} (609 nm), and {sup 6}H{sub 9/2} (653 nm), respectively. In addition, the optimum Sm{sup 3+} concentration in CaWO{sub 4} nanoparticles for optical emission was determined to be 1.0%. The Sm{sup 3+4}G{sub 5/2}->{sup 6}H{sub 7/2} (609 nm) emission intensity of Sm{sup 3+}-doped CaWO{sub 4} nanoparticles significantly increased with the increase of Sm{sup 3+} concentration, and showed a maximum when Sm{sup 3+} doping content was 1.0%. If Sm{sup 3+} concentration continued to increase, namely more than 1.0%, the Sm{sup 3+4}G{sub 5/2}->{sup 6}H{sub 7/2} emission intensity would decrease. The present materials might be a promising phosphor for white-light LED applications.