环氧改性醇酸树脂发光涂料的研制

以环氧改性醇酸树脂为成膜物质,添加稀土发光材料(SrAl2O4∶Dy3 ,Eu2 )制备出高性能发光涂料,并介绍配方及工艺。结果表明,所得涂料的干燥性好,耐盐水性,耐盐雾性,和耐化学品性佳,发光性能优良,余辉亮度强且余辉时间长,为优质的发光涂料。     

聚酯丙烯酸发光涂料的研制

为了提高发光涂料的耐候性、耐酸碱性、耐油性、耐腐蚀性和力学性能以及余辉强度和余辉时间,对聚酯丙烯酸树脂和铝酸锶铕发光材料的制备方法进行了研究,并将发光材料分散于聚酯丙烯酸树脂中,制备出了高性能的发光涂料.结果表明:用无色透明且透光性良好、特别是紫外线透过率高、透湿性小且耐水性、耐酸碱性、耐候性和力学性能优良的聚酯丙烯酸树脂作为主要成膜物质,将铝酸锶铕发光材料分散于聚酯丙烯酸树脂中制成的发光涂料涂抹性能好,耐腐蚀性、耐油性、耐酸碱性和耐候性强,力学性能优良,余辉亮度强,用照度200 lx的D65光源照射4 min的余辉亮度在10min时为20 mcd/m2,在60 min时为6 mcd/m2;制得的发光涂料余辉时间长,余辉时间在1 000 min以上,为优质的发光涂料.     

水性苯丙乳液长余辉蓄能发光涂料的制备与性能

为了提高新型碱土铝酸盐掺杂稀土元素发光材料的耐水性能,并保持其良好发光性能,以硅酸钠为硅源,采用液相沉积法在SrAl2O4:Eu2+,Dy3+长余辉荧光粉表面包覆SiO2膜。通过红外光谱(IR)、扫描电镜(SEM)、酸度计考察了包覆效果,优选了包覆反应条件。以包膜发光粉为颜料,水性苯丙乳液为成膜物质,添加适量的助剂,配制了一种水性蓄能发光涂料。用激发和发射光谱、发光亮度及余辉衰减研究了涂料及其涂膜的发光特性,优选了发光粉用量,并对发光涂料及其涂膜的其他性能进行了测试。结果表明:当SiO2包覆量为9%(质量分数),反应温度为80℃时,SiO2能均匀地包覆在SrAl2O4:Eu2+,Dy3+长余辉荧光粉表面,使其耐水性提高,而又不影响其发光性能;日光和一般的荧光灯都可以有效激发该发光涂料,当发光粉含量为20%(质量分数)时,水性蓄能发光涂料及其涂膜的综合性能优良,余辉时间可达12 h以上。     

新有机夜光材料发光超1h

正英国《自然》杂志近日发表研究报告称,日本科学家研发了一种能够发光超过1h的有机夜光材料。与现行的夜光材料生产系统相比,文章中介绍的材料不含稀有元素,且不需要很高的制造温度。长余辉发光(LPL)材料又被称为蓄光型发光材料,常被用作夜光涂料,广泛应用在仪表、光电子器件、紧急标志等物件以及国防军事领域上。它的原理是一种光致     

新型功能材料

长余辉发光材料研制成功将印有文字和图像的纸片盖在透明玻璃上，采用短波紫外线和X射线等进行高能电磁辐射，这种玻璃就能自动将文字和图像“默记”。在暗背景中保存一个月后，这种玻璃仍能将文字和图像再现出来。这种神奇玻璃是中科院长春应用化学研究所研制成功的，这是从稀土中提取的一种名叫长余辉发光材料做成的。长余辉发光材料在太阳光、日光灯或其他高能电磁辐射照射下储存能量，在暗背景中再将能量释放出来，从而发光。中科院长春应用化学研究所以稀土为主要激活剂，先后成功研制出红光、绿光、蓝光和紫光的长余辉发光材料，最长…     

GB18582《室内装饰装修材料内墙涂料中有害物质限量》国家标准介绍

１标准适用范围的界定内墙涂料通常以水性涂料为主，水性内墙涂料根据成膜物质类型又可分为以各类合成树脂乳液为成膜物的乳胶漆和以聚乙烯醇缩甲醛为成膜物的水溶性涂料（俗称１０７涂料、８０３涂料等）。目前大量用于室内装饰用的乳胶漆是以各类合成树脂乳液为成膜物的水性涂料，是在２０世纪中叶发展起来的一种环保型产品，是水性化涂料的典型代表。由于它以水为分散介质，采用对人体无害的原料作为成膜物，相对于溶剂型涂料乃至绝大多数装修材料来说，水性乳胶漆是对人体健康影响极小的产品，是涂料产品的发展方向，自问世以来以无毒、…     

步兵轻武器夜瞄复合发光材料发光性能研究

以发光材料为基材研制了一种新型步兵轻武器夜瞄复合发光材料,对其化学载体成分的透光率和复合荧光粉体的发光性能进行了测试,在此基础上对合成之后的夜瞄复合发光材料的发光性能进行研究。结果表明:夜瞄复合发光材料发光时间长,亮度高,可满足步兵轻武器夜间瞄准需求。     

高纯稀土纳米材料

我公司采用先进工艺技术，生产纯度在99．9％～99．9995％的各种高纯超细稀土纳米材料及其化合物(硝酸稀土、醋酸稀土、柠檬酸稀土等)。广泛应用在发光材料、晶体材料、电子陶瓷、高效催化材料、精密抛光、抗紫外线材料(化纤、涂料、塑料)等领域。公司有良好的商业信誉，产品质量稳定可靠．供货及时，价格合理。     

硼的含量对SrAl2O4：Eu^2＋,Dy^3＋发光性能的影响

采用高温固相法制备SrAl2O4：Eu^2＋，Dy^3＋长余辉发光材料。借助材料的激发光谱、发射光谱和X射线衍射，分析研究掺杂B对SrAl2O4：Eu^2＋，Dy^3＋发光材料发光性能的影响及合适的加入量。结果表明：B的加入量影响着发光材料的发光性质，B的最佳加入量为58％。     

阻燃剂DOPO的中试研究

由于环保原因，含卤类阻燃剂已逐步被有机磷阻燃剂所取代，9，10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）就是有机磷阻燃剂系列产品之一，可用于纺织、涂料、塑料、建材等行业，特别在纺织行业，作为涤纶的阻燃剂，其效果显著。DOPO及其衍生物可广泛用于合成纤维、电子设备用塑料、铜衬里压层、电路板、半导体封装材料、光敏材料和发光材料等阻燃。     

三基色镍基自敏复合涂层的制备及其性能研究

检测耐腐蚀涂层在腐蚀环境下的完整性, 对预测涂层工作寿命至关重要。通过电化学沉积法成功地将三基色无机荧光颗粒: BaMgAl₁₁O₁₇: Eu²⁺(蓝粉), Y₂O₃: Eu³⁺(红粉), CeMgAl₁₁O₁₉: Tb³⁺(绿粉)与金属镍复合, 在瓦特光亮镀镍浴中沉积出具有三基色指示功能的镍基自敏复合涂层。采用X射线衍射(XRD)、扫描电镜(SEM)、表面轮廓仪、维氏硬度计、荧光发射光谱和电化学测试手段分别对涂层组织形貌结构、润湿性、沉积率、硬度、发光性能及自敏性能进行了检测, 结果表明, 阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)和非离子表面活性剂聚乙二醇(PEG)可以有效提高三基色荧光粒子沉积率。三种荧光粒子与金属镍之间表现出不同的润湿性和匹配性, 使得其在镍基复合涂层中具有不同的作用: Y₂O₃: Eu³⁺荧光粒子改变了涂层结晶取向, 且使晶粒细化, BaMgAl₁₁O₁₇: Eu²⁺使涂层组织呈现节瘤状, Y₂O₃: Eu³⁺和CeMgAl₁₁O₁₉: Tb³⁺粒子明显提高了涂层硬度。三基色荧光粒子在腐蚀前后表现出不同的发光特性, 可以有效指示出涂层工作周期内的完整性, 起到良好的自敏检测作用。     

Negative thermal quenching of K3AlF6:Mn4+@GQDs phosphors caused by enhancement of the conversion of heat energy into light energy

In order to improve luminescent thermal stability, a series of new K₃AlF₆:0.02Mn⁴⁺@GQDs _{x mg/mol} phosphors (graphene quantum dots: GQDs) have been synthesized with a coating strategy. Enhancement of luminescent thermal stability and emission induced by coating of GQDs are observed, which high luminescent thermal stability is caused by negative thermal quenching (NTQ). The mechanism of the NTQ is discussed and suggested as: some of thermal energy is transformed into light energy. Finally, warm white light with high color rendering index (Ra) and low correlated color temperature (CCT) is obtained from prototype white light-emitting diodes (WLEDs) using the optimal coated sample.

     

Stability improvement of moisture sensitive CaS:Eu micro-particles by coating with sol-gel alumina

Here we report on the usage of alumina coating for the protection of moisture sensitive CaS:Eu²⁺ micro-particles. Alumina sol was prepared using a water-free sol-gel technique and single crystal CaS:Eu²⁺ luminescent micro-particles were synthesized via solvothermal way. After deposition of the particles on a substrate, they were coated with an alumina layer and heat treated at 500 °C for 30 min. In addition to in situ measurements of accelerated ageing of the luminescent particles, photoluminescence (PL) spectra of coated and uncoated particles were compared. Coated particles showed a broad band PL emission with a maximum at 650 nm identical to that of uncoated particles. Coating with an alumina layer drastically increased the resistivity of the luminescent material against moisture.     

One-pot synthesis and strong near-infrared upconversion luminescence of poly(acrylic acid)-functionalized YF<Subscript>3</Subscript>:Yb<Superscript>3+</Superscript>/Er<Superscript>3+</Superscript> nanocrystals

This paper describes the synthesis of new upconverting luminescent nanoparticles that consist of YF₃:Yb³⁺/Er³⁺ functionalized with poly(acrylic acid) (PAA). Unlike the upconverting nanocrystals previously reported in the literature that emit visible (blue-green-red) upconversion fluorescence, these as-prepared nanoparticles emit strong near-infrared (NIR, 831 nm) upconversion luminescence under 980 nm excitation. Scanning electron microscopy, transmission electron microscopy, and powder X-ray diffraction were used to characterize the size and composition of the luminescent nanocrystals. Their average diameter was about 50 nm. The presence of the PAA coating was confirmed by infrared spectroscopy. The particles are highly dispersible in aqueous solution due to the presence of carboxylate groups in the PAA coating. By carrying out the synthesis in the absence of PAA, YF₃:Yb³⁺/Er³⁺ nanorice materials were obtained. These nanorice particles are larger (∼700 nm in length) than the PAA-functionalized nanoparticles and show strong typical visible red (668 nm), rather than NIR (831 nm), upconversion fluorescence. The new PAA-coated luminescent nanoparticles have the pottential be used in a variety of bioanalytical and medical assays involving luminescence detection and fluorescence imaging, especially in vivo fluorescence imaging, due to the deep penetration of NIR radiation.      

Continuous white luminescence of ZnS:Pb2+ and core/shell ZnS:Pb2+/ZnS nanocrystals

High-quality water-soluble ZnS:Pb2+ nanocrystals were synthesized via a simple chemical codepositing method. The as-synthesized ZnS:Pb2+ nanocrystals show high monodispersity and crystallinity with a narrow size distribution (3.2 +/- 0.4 nm). ZnS:Pb2+/ZnS core/shell structures were also obtained by coating a ZnS shell displaying significantly enhanced photoluminescence (PL) intensity and photostability. For the ZnS:Pb2+/ZnS samples the position of emission spectrum shows a red-shift of approximately 10 nm, which produces a fairly pure white emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.31, 0.33). These phenomena are explained by a model of multiple Pb2+ luminescent centers.     

磷光粉表面包覆对铜基磷光复合材料发光及摩擦性能影响

选用热稳定性好的SiO2为包覆物,采用溶胶-凝胶法,以正硅酸乙酯为硅源,对商用磷光粉SrAl2O4∶Eu2+,Dy3+表面进行包覆,以解决磷光粉在高温下制备复合材料过程中因与金属粒子接触以及高温氧化产生猝灭的问题。实验通过热压烧结制备块体铜基磷光复合材料,考评包覆工艺对高温下制备的复合材料发光及摩擦性能的影响。通过X射线衍射、扫描电镜、荧光分光仪等设备对包覆前后磷光粉的表面形貌和发光性能进行分析和表征,采用摩擦试验机对包覆前后磷光粉与高铝青铜粉末混合制备复合材料烧结试样的摩擦性能进行研究。结果表明磷光粉表面包覆可有效避免其在高温下氧化猝灭和接触猝灭,包覆后磷光粉应用于铜基复合材料中可有效降低复合材料的磨损量,提高材料的耐磨性,当包覆比为10%时复合材料的发光性能、耐磨损性能最佳。     

利用高度稳定的发光薄膜提高多晶硅太阳能电池的光伏效率（英文）

硅基太阳能电池已经主导了整个光伏市场,但是仍然面临着光电转化效率低的问题,其中部分原因是其对紫外线的利用率较低.稀土铕配合物能够将紫外光转化为可见光,有望提高硅基太阳能电池的光电转化效率.然而,这类配合物较低的稳定性限制了它们的实际应用.本文中,我们制备了一种高度稳定的EVA/Eu(ND)4-CTAC发光薄膜,将其覆盖在大尺寸的多晶硅太阳能电池表面(110 cm^2)可以使得光电转化效率从15.06%提高到15.57%.在500 h的加速老化实验中荧光性能几乎没有下降,证明了发光薄膜的超强稳定性.在如此大的有效面积上,发光薄膜使硅基太阳能电池的转换效率提高0.51%的绝对值,同时实现超高的稳定性,说明该发光膜在光伏工业上具有广阔的应用前景.     

碱土铝酸盐长余辉发光颜料表面包膜的研究

采用四乙氧基硅(TEOS)为硅包膜剂,在SrAl₂O₄:Eu²⁺,Dy³⁺发光颜料颗粒表面进行包膜,通过扫描电镜(SEM)、粒度测量、BET比表面积测试及X射线光电子能谱(XPS)分析,证实发光颜料颗粒表面包覆了一层厚度约为14nm的致密均匀的SiO₂纳米膜.耐水性能及发光性能测试表明,包膜后发光颜料耐水性明显改善,发光性能变化较小.分析表明包膜过程实际上是水合二氧化硅在颜料颗粒表面的溶胶-凝胶过程,其最佳工艺条件为:包膜溶液pH约为10;包膜温度控制在80℃;包膜时间为3.0h.     

Biomolecule-directed assembly of self-supported, nanoporous, conductive, and luminescent single-walled carbon nanotube scaffolds

A single-walled carbon nanotube self-suspended network of exceptionally low density is formed by DNA-streptavidin-assisted assembly where the DNA complex serves as a cross-shaped point connector. The macroscopic nanotube aerogel is conductive and luminescent and presents an excellent scaffold for subsequent functionalization. For example, platinum and titanium dioxide coating of the nanotube network is demonstrated.     

Zn2SiO4：Mn光致发光薄膜的溶胶-凝胶法制备及发光性质的研究

以乙酸锌、氯化锰、无水乙醇、正硅酸为主要原料,用溶胶-凝胶浸渍提拉法在石英片上制得Zn2SiO4：Mn薄膜前驱体,经高温煅烧获得到Zn2SiO4：Mn荧光薄膜,荧光分析其发光性能。