Ca3(VO4)2:Eu3+的燃烧合成及光致发光

以稀土氧化铕、偏钒酸铵、硝酸钙为原料,以尿素作燃烧剂,采用燃烧法合成了Ca3(VO4)2:Eu3+.利用XRD,SEM,荧光分光光度计对其结构、形貌和发光性能进行了表征,并探讨其实际应用的可能性.结果表明,燃烧法合成的稀土Eu3+掺杂ca3(VO4)2荧光粉颗粒规则、均一,发射主峰位于614.0 nm,是现有PDP商品(Y,Gd)BO3:Eu3+红色荧光粉的良好替代品.     

研究动态

由中国地质大学成功研制的纳米稀土高效荧光粉 ,6月底在武汉通过国家级技术鉴定 ,填补了一项国内空白。纳米稀土高效荧光粉采用稀土为原料 ,发光性能优越 ,可广泛应用于公众显示屏、移动电话、车载仪表、电子计算机、建筑材料、日用化工等多种领域。我国是世界上稀土储量最大的国家 ,但目前电子信息等行业所需的荧光粉大部分是国内的稀土出口再由国外加工生产 ,武汉地大纳米荣光粉研制的成功改变了这一现状。由中国地质大学 (武汉 )研制的超细高岭土并研发的纳米氧化锆粉体的制备技术 ,9月底通过了湖北省科技厅和教育厅组织的鉴定。我国制造…     

稀土荧光粉的制备技术研究与展望

稀土荧光粉作为荧光粉领域的主要类型之一,其工业制备技术成熟,性能优良,应用广泛。稀土荧光粉主要用于现代照明光源、交通信号灯、汽车状态指示、液晶显示（LCD）的背光源和大屏幕显示等方面。要想获得优异性能的荧光粉,对制备工艺的研究是关键。介绍了目前国内外制备稀土荧光粉的各种方法,主要有高温固相反应法、软化学法、物理微波合成法等。对这些方法的优缺点进行了比较。最后对荧光粉合成方法的发展前景及今后的研究趋势进行了展望。     

稀土掺杂花状钨酸钙纳米晶溶剂 热法合成及其发光性能

以水-乙二胺二元溶剂热法及热处理合成了四方晶系稀土掺杂花状钨酸钙纳米晶。考察了混合溶剂比例、煅烧温度及掺杂稀土离子等条件对钨酸钙发光性能的影响,并分析了其形成机理。利用X射线衍射（XRD）、扫描电镜（SEM）、傅里叶变换红外光谱（FT-IR）和光致发光（PL）光谱等对钨酸钙结构、形貌及其性能进行了表征。结果表明：在水与乙二胺体积比为1∶2、反应温度为160 ℃、反应时间为24 h条件下合成前驱物,前驱物经800 ℃煅烧得到四方晶系稀土掺杂花状钨酸钙纳米晶;掺杂不同稀土离子得到在紫外光激发下发出不同颜色光的钨酸钙基荧光粉。     

纳米磷酸盐及其应用技术进展

介绍了纳米磷酸铁锂在动力电池正极材料,纳米羟基磷灰石在人工生物材料、缓控释药物载体、环境功能材料,纳米磷酸盐复合肥料在新型农用肥料,纳米稀土磷酸盐在节能灯荧光粉,纳米复合磷酸盐颜料以及纳米磷酸盐抗菌材料等方面的应用。并对发展我国纳米磷酸盐产业提出了建议。     

表面活性剂对YPO_4:Eu形貌结构和荧光性能的影响研究

稀土磷酸盐纳米发光材料又被称为荧光粉,可广泛应用于照明、太阳能、石油、冶金等领域。本文主要研究了水热法制备的稀土磷酸盐纳米发光材料,基于材料的微观结构和形貌对其发光性能的影响,研究了稀土磷酸盐纳米材料的微观结构对性质的影响及稀土离子掺杂对其微观结构和发光性能的影响。本文研究了在相同实验参量的条件下,通过使用不同的表面活性剂,采用水热法合成了YPO_4:Eu纳米发光材料。探究了表面活性剂对YPO_4:Eu下转换发光的影响。对产物进行了相应的检测并进行分析,结果表明表面活性剂对产物的性能有较大影响。     

NaGd(MoO4)2∶Eu3+红色荧光粉的制备及发光性能研究

本文采用溶胶凝胶法,以钼酸铵、硝酸钠、氧化钆、氧化铕作为原料合成NaGd(MoO_4)_2:Eu~(3+)红色荧光粉。利用XRD对所合成的荧光粉进行结构分析,通过荧光光谱探究了样品的发光性能。结果表明:当退火温度为900℃,稀土离子Eu~(3+)的掺杂浓度为8%时所制备的荧光粉具有最佳的发光效果。     

基于稀土金属离子负载的金属有机框架纳米晶制备及其荧光性能研究

首先采用液相溶剂热法制备Al-MIL-53(一种Al-MOFs)金属有机框架材料,用浸渍法将不同Eu3+和Tb3+离子引入到框架骨架中形成发光中心,获得纳米晶荧光粉。通过XRD、FT-IR、TGA、SEM等方法对材料进行结构、形貌、热稳定性、微观形貌的表征。利用PL、CIE表征其发光性能,发现其在紫外光激发下,具有不同的发光特性。结果表明,配体种类对稀土离子掺杂MOFs光学性能具有较大的影响。当配体为H3DBC-COOH时,稀土金属离子浓度分别为0. 06mol/L Eu3+、0. 04mol/L Tb3+时,获得色坐标为((0. 3327,0. 3279)白光纳米晶荧光粉。     

一种新型稀土纳米粒子的可控合成

纳米粒子的粒径与其应用联系紧密,研究发现六方相稀土纳米晶的上转换效率比立方相高,为可控合成一定粒径、六方相的稀土纳米粒子,文章采用溶剂热法,以Na YF4为基质,掺入一定比例在稀土元素Yb及Er,并改变反应温度、稀土掺杂量等影响因素,得出在300℃条件下,合成分散性好的六方相稀土纳米粒子。为稀土纳米粒子的可控合成提供依据,同时对研究稀土纳米材料的应用提供参考。     

钒稀土发光材料的研究现状与进展

钒稀土发光材料因其在真空紫外照射下有稳定的发光效率,在PDP、FED等领域显示出了极好的应用价值,已成为近年来国内外学者研究的热点方向之一.随着纳米技术的进步、发光机理的进一步深入研究,钒稀土发光材料也将步入新的发展阶段.本文主要介绍了钒稀土发光材料的研究现状、主要的合成方法与技术、发光机理、主要应用领域以及存在的主要问题,预测了其今后的发展趋势.     

Rare‐Earth Free Phosphors with Ultra‐Broad Band Emission Application for High Color Rendering Index Lighting Source

Rare‐earth containing phosphors have been widely applied in lighting and display fields in the past century. Lower cost rare‐earth free phosphors with high performance are highly desired driven by the exhaustion of rare earth resources and the requirement of cheaper production. Herein, Cu⁺ ions doped tetracalcium phosphate (TTCP) yellow emitting phosphors with quantum yield of 21% are exploited. Particularly, ultra‐broad band emission with a full width at half maximum (FWHM) about 200 nm throughout almost entire visible light region is observed for TTCP: Cu⁺ phosphors, evidencing its promising application in high color rendering index (CRI) lighting source. White light emission with CRI value about 94.3 is generated by combining this TTCP: Cu⁺ phosphor with commercial BaMgAl₁₀O₁₇: Eu²⁺ blue phosphor, exhibiting superiority over the traditional trichromatic phosphors. Therefore, we predict great potential application for this cheaper rare‐earth free TTCP: Cu⁺ phosphor in high CRI lighting sources.     

近紫外激发单一基质荧光粉的研究进展

白光LED （light-emitting diode）因其优异的发光性能被誉为是第四代固体照明光源。本文以量子效率作为核心参数,以暖白光为最终目标,分别对蓝、绿、红三基色稀土掺杂无机荧光粉和单一基质单掺、共掺、多掺的暖白光荧光粉的研究现状进行调研。结果表明,高量子效率的近紫外激发蓝色荧光粉其激活离子主要为Eu²⁺、Ce³⁺,绿色荧光粉为Tb³⁺和Eu²⁺,红色荧光粉为Eu³⁺和Eu²⁺。现有的单一基质暖白光荧光粉仍然存在诸多技术瓶颈,如：红光不足、显色指数偏低、量子效率偏低等。基于此,建议从已有的高效红粉出发制备单一基质白光荧光粉,以消除光谱中缺乏红色成分这一难题,并适当引入除Mn之外的过渡金属元素,同时加强对基质动力学理论,以及基质和稀土之间的电子耦合作用动力学理论的研究,期望能实现稀土掺杂无机荧光粉的设计计算与可控制备。     

YAG：Ce3＋黄色荧光粉的高温固相法制备

采用高温固相法制备了Ce3＋激活的钇铝石榴石荧光粉Y3Al5O12：Ce3＋（YAG：Ce3＋）。采用X射线衍射法对所制备的样品进行结构分析,采用荧光光谱仪对样品进行发光分析。结果表明,在YAG：Ce3＋的高温固相法制备过程中原材料和助熔剂用量以及稀土离子掺杂量、研磨时间、灼烧温度和时间等,都会对所制备样品的成相和发光性能产生影响。     

Rapid green preparation of Lu7O6F9:RE (RE = Eu3+/Gd3+, Yb3+/Er3+) phosphors using ionic liquids

Rare earth oxyfluoride materials are a fascinating class of host matrixes for various applications. However, rapid green preparation of multifunctional rare earth oxyfluoride phosphors remains a huge challenge. In this work, we report the fast synthesis of Lu₇O₆F₉ using ionic liquids (ILs), which enables the precursors to be obtained at 10 min. The effects of calcination temperature, reaction temperature, reaction time and fluorine source on the phase and morphology of precursors and products are elaborated and the growth mechanism is put forward. Eu³⁺ alone and Yb³⁺, Er³⁺ co-doped samples were prepared to investigate the down-conversion (DC) and up-conversion (UC) properties, respectively. Besides, Gd³⁺ ions were introduced to the Eu³⁺ doped products, endowing the phosphors more intense luminescence and paramagnetic properties. The proposed facile synthesis route, excellent luminescence, thermal stability and paramagnetic properties open up the way to obtain rare earth fluoride and oxyfluoride for multifunctional applications.     

铽-N-苯基邻氨基苯甲酸的合成及荧光性质

采用共沉淀法制备了稀土铽的N-苯基邻氨基苯甲酸二元配合物.同时,采用溶胶-凝胶法制备了掺杂稀土铽的N-苯基邻氨基苯甲酸二元配合物的SiO2凝胶玻璃复合发光体,研究了合成的2种配合物的热稳定性及荧光性质.结果表明,在凝胶玻璃中合成的稀土二元配合物,其热稳定性明显提高,而其特征荧光基本保持不变.     

Synthesis and optical characterization of novel Sr3Ga2O6:Eu phosphor

Alkaline earth metal gallets have been identified as an important ceramic material. The crystal chemistry of many of these gallets is well explored; however, very rare studies regarding optical properties of rare earth (RE) ions doped in such gallets, particularly in Sr₃Ga₂O₆ host, have been carried out. The present study reports on synthesis and characterization of novel Sr₃Ga₂O₆:Eu³⁺ phosphors. The phosphors have been synthesized using a conventional solid state reaction method. Crystal structure, morphology and luminescence properties (excitation, emission and CIE coordinate) of these phosphors have been studied as a function of sintering temperature and Eu³⁺ concentration. X-ray diffraction study reveals that the phosphor sintered at low temperature (900 °C) contains an impurity phase which is removed at higher sintering temperatures and results into cubic crystalline phase of Sr₃Ga₂O₆. Particle size of the phosphor increases with an increase in sintering temperature which results to a red shift in the peak position of excitation band lying in a broad range from 250 to 370 nm. Optimum emission intensity is attained for 0.12 mol% concentration of Eu³⁺ ions; above this concentration, a quenching in emission intensity is observed.     

LED用稀土Eu掺杂硅酸盐基荧光粉的研究进展

由于硅酸盐为基体的光转换材料具有原料来源丰富、工艺适应性广泛及晶体结构稳定性较高等特点,目前已成为白光发光二极管(light-emitting diode,LED)用荧光粉的研究重点之一。本文综述了近年来国内外硅酸盐基稀土荧光粉材料的研究进展,对硅酸盐基稀土荧光粉的材料体系、发光机理及发光特性的改进方面进行了分析与探讨。通过比较固相反应法和溶胶-凝胶法两种不同制备方法的优缺点,阐述了不同制备方法对白光LED质量的影响,并对硅酸盐基荧光粉的发展趋势和应用前景作了简要展望。     

稀土掺杂量子剪裁和上转换发光材料的制备及应用进展

稀土元素特殊的电子构型,使其具有优异的光性能,成为新的发光材料的宝库。在照明显示、分析检测等领域,稀土发光材料近年来已经得到了广泛的应用。而且也有多种不同的稀土发光材料问世,如稀土长余辉发光材料和稀土配合物发光材料等。重点介绍了两种新型的稀土发光材料：拥有高效下转换发光效率的稀土掺杂“量子剪裁”发光材料和在生物医学领域有着巨大潜力的稀土掺杂“上转换”发光纳米晶体。对两种发光材料的发光机理进行了描述,并重点展示了两种材料的制备和应用进展。     

高表观密度硬脂酸稀土的合成工艺

将化学计量比的硬脂酸、氯化稀土溶液、部分烧碱(NaOH)溶液和适量水加热,然后慢慢加入余量的烧碱溶液,可合成得到色泽和纯度与传统复分解法工艺产品完全相同、而表观密度大大提高的硬脂酸稀土产品。与复分解法工艺相比,新工艺还显著提高了生产效率、降低了能耗和水耗。     

LED-pumped intense red luminescence based on Ba2LaTaO6: Mn4+ double perovskite phosphor

Non-rare earth Mn⁴⁺ ion-doped red oxide phosphors have great potential for applications in warm white light-emitting diodes (wLEDs) due to their low cost and stable physicochemical properties. Herein, a series of Ba₂LaTaO₆ (BLTO): Mn⁴⁺ phosphors were successfully synthesized by the high-temperature solid-state method. The theoretical values of the band gap calculated by the density functional theory are close to the experimental values obtained by the absorption spectroscopy. In addition, the phosphors have a broad excitation band in the wavelength range of 280–550 nm and emit red light at the peak wavelength of 681 nm under excitation. The concentration quenching of the BLTO: Mn⁴⁺ phosphor was caused by dipole-dipole interactions. The activation energy and the average decay lifetimes of the samples were calculated. Meanwhile, the effects of synthesis temperature and Li⁺ ion doping on the luminescence performance of the samples were also investigated. Satisfactorily, the color purity and internal quantum efficiency of the phosphor reached 98.3% and 26.8%, respectively. Further, the samples were prepared as red-light components for warm wLEDs. The correlated color temperature, color rendering index, and luminous efficiency of the representative devices driven by 60 mA current were 5190 K, 83.3, and 81.59 lm/W, respectively. This work shows that the BLTO: Mn⁴⁺ red phosphor with excellent luminescence performance can be well applied to warm wLEDs.