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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Synthesis, Structural, and Optical Properties in Monoclinic Er:KYb(WO4)2 Nanocrystals
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Synthesis, Structural, and Optical Properties in Monoclinic Er:KYb(WO4)2 Nanocrystals

机译：Er：KYb（WO4）2单斜晶纳米晶体的合成，结构和光学性质

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摘要

Monoclinic-nondoped and erbium-doped KYb(WO4)2 nanocrystals around 50 nm were synthesized using the modified Pechini sol-gel method. Differential thermal and thermogravimetric analysis (DTA-TG) was used to study the thermal evolution of the precursor powder. X-ray powder diffraction (XRD) was used to confirm the presence of the monoclinic phase. We used electron microscopy techniques (SEM and TEM) to observe the morphology and particle size, and we estimated the particle size using Scherrer's equation. The optical spectroscopy of the trivalent ytterbium and erbium ions in monoclinic KYbW nanocrystals was studied by absorption and emission measurements at low and room temperature. The energy of the Stark sublevel of ytterbium and erbium in the ground- and excited-state KYbW nanocrystals has been determined. After exciting at 940 nm, the green photoluminescence (~4S_(3/2) -> ~4I_(15/2)) and the 1.5 μm infrared (~4I_(13/2) -> ~4I_(15/2)) emissions were observed because of the energy transfer from the ytterbium ~2F_(5/2) level to the ~4I_(11/2) erbium level. The decay times of Yb~(3+) (~2F_(5/2)) and Er~(3+) (~4I_(13/2)) excited levels were also studied at room temperature.
机译：利用改进的Pechini溶胶-凝胶法合成了单斜晶和掺的KYb（WO4）2纳米晶体，其波长约为50 nm。差示热和热重分析（DTA-TG）用于研究前体粉末的热演化。 X射线粉末衍射（XRD）用于确认单斜晶相的存在。我们使用电子显微镜技术（SEM和TEM）观察其形态和粒径，并使用Scherrer方程估算了粒径。通过在低温和室温下的吸收和发射测量，研究了单斜KYbW纳米晶体中三价和离子的光谱。确定了基态和激发态KYbW纳米晶体中和的Stark子能级的能量。在940 nm激发后，绿色光致发光（〜4S_（3/2）->〜4I_（15/2））和1.5μm红外光（〜4I_（13/2）->〜4I_（15/2））观察到发射是因为能量从from〜2F_（5/2）能级转移到〜4I_（11/2）level能级。在室温下还研究了Yb〜（3+）（〜2F_（5/2））和Er〜（3+）（〜4I_（13/2））激发能级的衰减时间。

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