Eu~(3+)激活MgO-Al_2O_3-SiO_2发光体的溶胶-凝胶法合成和特性研究

在实验室中,采用溶胶-凝胶法,在1000℃的温度下,合成出组成为2.692MgO-1.2Al_2O_3-4SiO_2:0.045Eu~(3+),0.009Bi~(3+)(加入Li~+作为电荷补偿剂)发光体。利用红外光谱,X射线粉末衍射、热重及差热分析研究了由凝胶至发光晶体的转变过程。采用岛津RF-540荧光分光光度计,在室温下测量了发光体的激发光谱和发光光谱。讨论了发光体的发光特性及Bi~(3+)对Eu~(3+)的敏化作用。     

Investigations of OSL properties of LiMgPO4:Tb,B based dosimeters

Lithium magnesium phosphate LiMgPO₄ (LMP) doped with Tb and B is one of new materials intended for use in optically stimulated luminescence (OSL) dosimetry. LMP doped with Tb and B luminophors were synthetized at IFJ PAN in Krakow. The investigations were carried out on self-developed dosimeters consisting of a slide with four LMP detectors and a light tight cover. LMP detectors were investigated in regard to their OSL properties using OSL reader named HELIOS adopted to the readouts of dosimetric cards. New LMP detectors showed high sensitivity to the ionizing radiation, good repeatability of OSL signal and good dose response, 25% of fading in the first two weeks after irradiation. Also, the pronounced dependence of OSL response on the energy of the measured radiation requires to apply the compensation filters.     

溶胶-凝胶法制备(Ca-Zn)O-Al_2O_3-SiO_2:Eu~(3+),Bi~(3+)发光体

用溶胶-凝胶法合成无机玻璃、玻璃陶瓷和陶瓷已得到发展。本文报道利用此法低温合成(Ca-Zn)O-Al_2O_3-SiO_2:Eu~(3+),Bi~(3+)发光体的研究结果。所用原料为99.99％的Eu_2O_3、99.99％的金属铝、99.999％的金属铋及CaCO_3、ZnCO_3和Li_2CO_3(提纯)。上述原料用HNO_3(GR)溶解。将计算的摩尔比量的Si(OC_2H_5)_4、C_2H_5OH和CH_3COOH以及Ca(NO_3)_2、Al(NO_3)_3、Zn(NO_3)_2、LiNO_3、Bi(NO_3)_3和Eu(NO_3)_3溶液,在一定的pH值下,在75℃水浴中回流数小时,经水解,缩聚成凝胶。制得     

一类多功能光电材料

适当掺杂的碱土金属硫化物(AES:D)在当前光电技术的多个重要方面具有很高高的应用价值,是一类奇异的多功能光电子及光子材料。本文讨论了其基本特性、重要应用、目前的状况及研究动向。     

发光体Mg_2Y_（8－x－y）（SiO_4）_6O_2：Eu_x~（3＋），B

采用Ｓｏｌ－Ｇｅｌ方法首次在比较低的温度下制备了具有氧磷灰石结构的发光体Ｍｇ２Ｙ８－ｘ－ｙ（ＳｉＯ４）６Ｏ２：Ｅｕ，Ｂｉ（ｘ，ｙ≥０），利用ＸＲＤ、ＩＲ、ＴＧ－ＤＴＡ三种手段研究了发光体的形成过程。室温（２９３Ｋ）和液氮温度（７７Ｋ）的荧光光谱表明Ｅｕ３＋和Ｂｉ３＋在这种基质中分别发射红光和蓝光，每ｍｏｌ基质中其最佳掺杂浓度分别为０．１４ｍｏｌ和０．０３ｍｏｌ，并且其发光都存在温度猝灭。Ｅｕ３＋的激光感生荧光光谱中存在两条５Ｄ０－７Ｆ０跃迁线，表明Ｅｕ３＋同时进入４ｆ格位和６ｈ格位。在Ｅｕ３＋、Ｂｉ３＋共掺杂的发光体中，观察到了Ｂｉ３＋→Ｅ３＋的部分能量传递。     

一种发红光的电子陷获型红外上转换材料的制备

本文研制的电子陷获(ET)型红外上转换材料是在改进传统工艺的基础上,使用硫化助熔法,在石英反应管中,基质合成和掺杂一次完成,具有工艺简单、生长周期短、重复性好的优点。由于反应在密闭系统中完成,安全可靠,对实验室环境保护好,用这种方法制备出的红外上转换材料,在室温下用紫外光或可见光激励后,用红外激发时发红光,并测得了其激发光谱(红外)和发射光谱(红光)。     

New pyrrolopyridazine derivatives as blue organic luminophors

New pyrrolopyridazine derivatives were synthesized as potential blue organic luminophors. Three different classes of pyrrolopyridazine derivatives were made, for example, aryl groups directly connected to the core PPY (pyrrolo[1,2-b]pyridazine-5,6,7-tricarboxylic acid trimethyl ester) moiety, aryl groups connected to the PPY via a vinylene linker and aryl groups connected to the PPY via an acetylene linker. Their optical and electrochemical properties were productively compared. One of the derivatives 2 showed a relative quantum yield as high as 0.9. Compound 8 in the vinyl bridged pyrrolopyridazine series has been characterized by its X-ray crystal structure analysis.     

一种发红光的电子陷获型红外上转换材料的制备

本文研制的电子陷获（ＥＴ）型红外上转换材料是在改进传统工艺的基础上，使用硫化助熔法，在石英反应管中，基质合成和掺杂一次完成，具有工艺简单、生长周期短、重复性好的优点。由于反应在密闭系统中完成，安全可靠，对实验室环境保护好，用这种方法制备出的红外上转换材料，在室温下用紫外光或可见光激励后，用红外激发时发红光，并测得了其激发光谱（红外）和发射光谱（红光）。     

New luminophor-activators based on (fluoro)quinolone antibacterials

It was shown that (fluoro)quinolone antibiotics form strongly fluorescent solid-state complexes with Eu(III) and Tb(III) lanthanide ions, with a wavelength red-shift beneficial for applications to greenhouse-cover polymers. Complexes with optimal properties were prepared by the mechanical activation of fine-dispersed composite mixtures with the lanthanide salts. The spectral properties, photo-stability to UV-light, and compatibility with the polyethylene matrix were investigated. The formulation additives of the tablet forms of the antibiotic medicines did not quench the fluorescence from the lanthanide ions. Therefore, the outdated drug forms of the antibiotics can serve as cheap recyclable sources for the covering material of greenhouses. In addition, diphenylguanidine (DPG) was investigated as a coligand. DPG enhanced fluorescence of the fluoroquinolone complexes by decreasing the non-radiative energy loss through O-H vibration of H₂O.