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<正> 荧光灯是依靠紫外线激发灯管内壁所涂的一层荧光粉而发光。因此荧光粉的质量好、坏将直接影响到荧光灯的质量。荧光灯常用荧光粉是卤磷酸钙荧光粉(下称卤粉)。卤粉自1942年发明以来,至今已有40多年的历史。经过不断的改进和完善制备工艺,质量得 相似文献
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文章介绍了LED及LED管灯的相关情况,针对广角度发光照明的LED管灯进行了结构分析和试验设计,深入研究了印刷的反光层位置对LED管灯发光照明性能的影响.通过分析配光曲线,在弧面对应圆周角100°的印刷体2上的C面进行反光粉印刷,其效果最佳,能实现330°的广角度发光;在印刷体3上的D面进行反光粉印刷,其效果相当,能实现320°的广角度发光,这两种方案都能获得光照均匀、无眩光、光效高的一种广角度LED管灯结构模型. 相似文献
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用球磨法与液相沉淀法两种方法分别制备了MnO2掺杂TeO2超细粉体,并通过x射线衍射(XRD)、扫描电子显微镜(SEM)和x射线激发发射光谱(XEL)对样品的物相组成、形貌等微观结构和发光性能进行了测试表征。结果表明,通过增加球磨混合时间和改变球磨介质,用球磨法可制得3-4μm的TeO2粉体。相比球磨法,用液相沉淀法可制得更加均匀和细小的超细粉体,所得粉体的平均颗粒尺寸约为1μm,其发光强度更高。 相似文献
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鞣型减水剂(AST)是南京林产化学工业研究所和河北青龙烤胶厂,研制成功的一种新型表面活性物质,可应用于增强石膏模型,改善泥浆性能,提高陶瓷坯料球磨效率和改善化工陶瓷干燥性能等方面。一九七九年四月份以来,在南京林产化学工业研究所和青龙烤胶厂同志的协助下,先后在我公司各厂进行了试验,并取得一定效果,现将试验情况总结如下: 相似文献
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湖南省冷水江9765厂采用辊压机预粉磨工艺对传统的水泥球磨系统进行改造,取得了节电、增产、降耗的效果,而且通过改造前后水泥实物质量对比分析证明,辊压机预粉磨工艺能有效地提高水泥实物质量,提高 相似文献
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CaHPO4是制备卤磷酸钙荧光粉的主要基料。它的特性和结构对卤磷酸钙荧光粉(以下简称卤粉)的质量起重要的影响,并且,随着对卤粉生产的深入研究发现,控制CaHPO4颗粒尺寸是制备分散型荧光粉的主要因素。因此,本文主要从控制CaHPO4颗粒尺寸(粒度)出发,探讨如何控制CaHPO4颗粒尺寸。 相似文献
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通过对学生目前使用的荧光台灯和护眼台灯的电磁波辐射测试发现,二者均不同程度地存在电磁波辐射问题,研究还发现,越靠近荧光台灯和护眼台灯部位,电磁波辐射越强,在离约35厘米之外,电磁波辐射强度可符合有关规定要求;经过进一步研究,制备了一种既透明又导电的塑料薄膜——透明导电高分子薄膜,该透明导电薄膜经过与荧光台灯灯罩前部连接并固定接地后,测试结果表明,透明导电高分子薄膜既阻挡了电磁波对使用者的辐射,同时又不影响照明使用。研究结果可用于屏蔽学生使用荧光台灯和护眼台灯时产生的电磁波辐射,从而最大限度地保障学生的身体健康。 相似文献
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铝酸锶铕类长余辉荧光涂料的发光性能的研究 总被引:5,自引:0,他引:5
本文测定了两种长余辉荧光粉的吸收光谱和发射光谱。比较了其发光性能,并将其中性能较好的一种荧光粉加入常用的不饱和聚酯树脂和环氧树脂中,制得了可见光可激发的具有光致发光的性能的长余辉荧光涂料。研究了其光强衰减行为。讨论了荧光粉含量、涂层厚度与荧光光强、余辉时间等的关系 相似文献
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镁铝尖晶石作为一种有前途的绿色环保型无机功能材料,凭借其优良的性能和低廉的价格等特点而受到广泛关注。在总结镁铝尖晶石基本结构和特点的基础上,对镁铝尖晶石粉体的主要制备方法及其在发光材料领域的研究进展进行了综述。相比于传统固相法和燃烧法,液相法中的环保型水热合成技术在制备特殊形貌的纳米级镁铝尖晶石功能粉体方面具有优势。此外,分析了稀土、过渡元素离子掺杂镁铝尖晶石(MgAl2O4)发光材料的荧光性能特点,指出稀土掺杂镁铝尖晶石的上转换发光尚待深入研究,以适应其在生物医学中的应用;过渡元素离子掺杂镁铝尖晶石发光材料,则凭借其鲜艳的色彩表现有望作为一种有前途的固体激光材料。 相似文献
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A comparative study of non-covalent encapsulation methods for organic dyes into silica nanoparticles
Numerous luminophores may be encapsulated into silica nanoparticles (< 100 nm) using the reverse microemulsion process. Nevertheless, the behaviour and effect of such luminescent molecules appear to have been much less studied and may possibly prevent the encapsulation process from occurring. Such nanospheres represent attractive nanoplatforms for the development of biotargeted biocompatible luminescent tracers. Physical and chemical properties of the encapsulated molecules may be affected by the nanomatrix. This study examines the synthesis of different types of dispersed silica nanoparticles, the ability of the selected luminophores towards incorporation into the silica matrix of those nanoobjects as well as the photophysical properties of the produced dye-doped silica nanoparticles. The nanoparticles present mean diameters between 40 and 60 nm as shown by TEM analysis. Mainly, the photophysical characteristics of the dyes are retained upon their encapsulation into the silica matrix, leading to fluorescent silica nanoparticles. This feature article surveys recent research progress on the fabrication strategies of these dye-doped silica nanoparticles. 相似文献
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Ruta Lasauskaite Schüpbach Markus Reisinger Björn Schrader 《Color research and application》2015,40(1):50-61
Two studies investigated how lighting influences perception of various materials. Experiment 1 focused on preferences of cold or warm light. Participants' task was to indicate preference for either coolish or warmish light for 20 different materials. The selection included materials typically used for wall or floor of interior spaces. Different hues and surface characteristics were present. Specifically two materials of blue color (cold hue) were preferred in a cold light while red carpet (warm hue) and synthetic turf materials were preferred in warm light. This latter choice was explained by automatic reference of synthetic turf to the appearance of natural grass. There were no clear light source preferences for other materials. Experiment 2 explored how the same 20 materials are evaluated under LED lighting in comparison to three other lighting situations (halogen lamp, high‐intensity discharge lamp, and compact fluorescent lamp). The results of this explorative study were not conclusive. The materials chosen for this experiment differed greatly in their structure and optical properties. In conclusion, light influence on the evaluation of materials needs systematic investigation in future research. © 2013 Wiley Periodicals, Inc. Col Res Appl, 40, 50–61, 2015 相似文献
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Quantum dots (QDs) are luminescent semiconductor nanocrystals with great prospective for use in biomedical and environmental applications. Nonetheless, eliminating the potential cytotoxicity of the QDs made with heavy metals is still a challenge facing the research community. Thus, the aim of this work was to develop a novel facile route for synthesising biocompatible QDs employing carbohydrate ligands in aqueous colloidal chemistry with optical properties tuned by pH. The synthesis of ZnS QDs capped by chitosan was performed using a single-step aqueous colloidal process at room temperature. The nanobioconjugates were extensively characterised by several techniques, and the results demonstrated that the average size of ZnS nanocrystals and their fluorescent properties were influenced by the pH during the synthesis. Hence, novel ''cadmium-free’ biofunctionalised systems based on ZnS QDs capped by chitosan were successfully developed exhibiting luminescent activity that may be used in a large number of possible applications, such as probes in biology, medicine and pharmacy. 相似文献