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| 1 | Nanosized complex fluorides based on Eu^(3+) doped Sr_2LnF_7(Ln=La, Gd)显示文摘A simple co-precipitation approach taking place between Ln3+, Sr2+ cations and F– anions, led to the formation of nanocrystalline Eu3+ doped Sr2LnF7(Ln=La and Gd) complex fluorides. The reaction was carried out in the presence of polyethylene glycol, PEG 6000 as a surfactant/surface modifier, providing small size and homogeneity of the products. The synthesized compounds were composed of small nanoparticles with an average size of 15 nm. All obtained Eu3+ doped compounds exhibited an intensive red luminescence. In the case of gadolinium based compounds, the energy transfer phenomena could be observed from Gd3+ ions to Eu3+ ions. In order to study the structure and morphology of the synthesized fluorides, powder X-ray diffraction(XRD) and transmission electron microscopy(TEM) measurements were performed. Also FT-IR spectra of the products were recorded, revealing the presence of PEG molecules on the nanoparticles surface. A spectrofluorometry technique was applied to examine optical properties of the synthesized nanoparticles. Excitation and emission spectra as well as luminescence decay curves were measured and analysed. The performed analysis revealed a red luminescence, typical for the Eu3+ ion situated in the inorganic, highly symmetric matrix. Concentration quenching phenomena and lifetimes shortening, together with an increasing of the Eu3+ doping level, were observed and discussed. Judd-Ofelt analysis was also performed for all doped samples, in order to support the registered spectroscopic data and examine in details structural and optoelectronic properties of the synthesized nanomaterials. | M.Runowski S.Balabhadra S.Lis | 2014 | Journal of Rare Earths2014，32，3： | 9 |
| 2 | Synthesis, structural and spectroscopic studies on GdBO_3:Yb^(3+)/Tb^(3+)@SiO_2 core-shell nanostructures显示文摘The presented study concerned up-converting core/shell type nanomaterials based on lanthanide(Ⅲ) ions, Ln(Ⅲ), doped orthoborates. The system studied composed of the GdBO3 doped with Yb3+/Tb3+ luminescent core ensured an effective cooperative sensitization up-conversion, resulting in a bright green luminescence. The silica coating process was performed by a modified St?ber method, which resulted in the formation of core-shell nanostructures, making them suitable for bioapplications. The nanophosphors and nanocomposites were obtained by various methods, such as co-precipitation in the presence of Triton X-100 and micelle synthesis with ethylenediaminetetraacetic acid(EDTA) as organic modifiers/surfactants. The synthesized nanomaterials were characterized with the use of powder X-ray diffraction(XRD), infrared light absorption with Fourier transform FT-IR spectra, transmission electron microscopy(TEM), up-conversion emission spectra under IR light, as well as excitation spectra, emission spectra and fluorescence lifetimes under UV light, and their photophysical properties were compared. | Konrad Kubasiewicz Marcin Runowski Stefan Lis Agata Szczeszak | 2015 | Journal of Rare Earths2015，33，11： | 2 |
| 3 | Tb^(3+)掺杂ZnWO_4基绿色荧光粉的发光性能显示文摘以柠檬酸为螯合剂,采用沉淀法制备了稀土Tb3+掺杂的ZnWO4绿色荧光粉前驱体。通过差热分析(DTA)、热重分析(TG)、X射线衍射(XRD)等手段对产物进行了表征。结果表明,当退火温度低于700℃时,得到的样品为非晶态,而高于850℃退火处理后为单斜结构。使用荧光分光光度计研究了Tb3+在ZnWO4基质中的发光性质。结果显示,ZnWO4:Tb3+样品在544nm波长光的监测下于200~300nm处出现由W→O及Tb→O跃迁共同作用产生的重叠激发峰和系列Tb3+的f-f跃迁锐峰,其中位于488nm处的激发峰非常显著,对应于Tb3+的7F6→5D4跃迁。说明该法制备的荧光粉ZnWO4:Tb3+能够被蓝光有效激发,可以与广泛使用的蓝光LED芯片的输出波长相匹配。在488nm波长光的激发下观察到ZnWO4粉末中Tb3+的544nm(5D4→7F5)强的特征发射,说明ZnWO4:Tb3+粉末可作为白光LED的绿色补偿荧光粉。当以267nm激发ZnWO4:Tb3+时,有宽的WO2-4特征发射峰和Tb3+的5D4→7F6及5D4→7F5跃迁产生的发射峰,随着Tb3+掺杂浓度的增加,WO2-4的特征发射强度逐渐降低,而Tb3+的5D4→7F5跃迁强度增大,表明Tb3+与WO2-4之间有能量转移。 | 莎仁 杨明学 | 2015 | 稀有金属2015，39，2： | 1 |
| 4 | LaPO_4:Gd^(3+),Tb^(3+)的制备及其发光性质研究显示文摘采用化学共沉淀法合成了双组分稀土离子共掺的单一基质绿色荧光粉La PO4:Gd3+,Tb3+.研究结果表明:荧光粉为尺寸均一、直径约50 nm的小粒子团聚形成的球状颗粒;其X射线衍射峰与六方相La PO4(标准卡片JCPCDS 75-1881)完全相同,Gd3+、Tb3+取代La3+进入晶格,没有形成杂质;该荧光粉在264 nm波长激发下,最强发射峰位于545 nm处,呈绿色;荧光粉中Gd3+为敏化剂,有助于Tb3+的能量传递,使荧光强度增大;Tb3+为激活剂,随着Tb3+掺杂量的增加,荧光强度逐渐增大,但是当Tb3+掺杂量>7%时会产生浓度猝灭现象. | 王静 王茜 孙佳林 欧阳艳 何晓燕 | 2016 | 伊犁师范学院学报(自然科学版)2016，10，3： | 1 |
| 5 | 稀土氟化物纳米材料的应用研究进展显示文摘氟化物纳米材料由于其独特的光、电、磁等性质,在光学器件、生物标记等领域具有广泛的应用,已成为材料科学领域研究的热点之一,尤其是稀土金属氟化物。合成氟化物纳米材料的方法多种多样,已成功制备出了球形纳米颗粒、纳米线、纳米花、复合结构纳米晶、核壳结构纳米材料等。本文主要列举了几种常见的稀土氟化物,重点对其合成以及应用进行了综述,并结合其特点,进行了展望。 | 张胜海 吴睿 张强 田光辉 刘存芳 宋娟 郭泓 魏布谊 吕家根 | 2019 | 化学研究与应用2019，31，3： | 0 |
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