荧光陶瓷研制及其照明与显示应用进展

第四代发光二极管(LED)光源具有节能、环保、高效、长寿命等特性,随着经济社会的发展,在海洋、港口、体育场馆等大空间大照度应用场合日益增多。荧光陶瓷具有内在散热好、光效高、物化稳定等优点,解决了传统荧光粉胶LED大功率化“散热困难”和“封装失效”以及光源体积大的技术瓶颈,成为新型LED照明以及激光(LD)照明的优选荧光体。教育、展厅和医疗等照明场所对高光效、高显指、低色温等高品质LED照明需求旺盛,新一代MiniLED等RGB显示模组迅速发展,对光效、体积、色纯度提出更高要求,高性能荧光陶瓷研究方兴未艾。本文回顾了LED/LD照明/显示用荧光陶瓷的研究进展和应用情况,并展望了未来荧光陶瓷性能提升策略和发展趋势。     

小功率陶瓷金卤灯研制成功

之前国内普遍使用的为高压钠灯和石英金属灯,两者均有利有弊,高压钠灯显色性差,石英金属灯因石英易与金属卤化物起反应,光色稳定性不强,而陶瓷金卤灯却能同时克服这两项缺点,集它们的优点于一身：光效高,显色特性好,且达到一定寿命,市场前景看好。在国外,陶瓷金卤灯的研制开发在上世纪90年代中期就开始了,国内需要只能依靠进口。     

浅谈水泥工厂的照明设计

<正>1光源及灯具选择水泥工厂光源的选择主要考虑光源的色温、显色性及光效,同时尽量避免采用含汞、铅等有害物质的光源,以减少对环境的影响。水泥工厂的照明光     

无极灯在玻璃厂节能改造中的应用

高频无极灯作为一种新型光源，具有光效高、显色性好、寿命长等特点。本文介绍了高频无极灯的结构、发光原理及在玻璃厂中的实际应用，并给出了详细的技术数据及节能效果分析。     

白光LED用定向凝固Al2O3/YAG:Ce^(3+)共晶荧光复合陶瓷研究进展EI北大核心CSCD

白色发光二极管(WLED)具有长寿命、高光效、节能环保等独特优势,是目前公认的第四代绿色照明光源,在照明等高技术领域具有重要的应用前景.目前,WLED的主要实现形式为蓝光芯片搭配YAG:Ce^(3+)荧光粉,封装荧光粉的树脂导热性较差,导致LED的发光性能随温度的升高逐渐下降,难以应用于大功率照明.因此,如何获得高质量、高稳定性、无需树脂的块体荧光材料成为提升WLED发光效率和应用可靠性的关键.近年来,利用定向凝固方法制备的高性能Al2O3/YAG:Ce^(3+)块体共晶荧光复合陶瓷以其优良的发光性能、高温强度、热稳定性以及低的背散射损失和高量子效率,被认为是一种有望替代荧光粉、用于大功率WLED照明的新型块体荧光材料.总结了近年来发展的定向凝固Al2O3/YAG:Ce^(3+)共晶荧光复合陶瓷的主要制备方法,阐述了共晶荧光复合陶瓷的凝固组织、发光机理以及影响发光性能的主要因素,展望了白光LED用Al2O3/YAG:Ce^(3+)共晶荧光复合陶瓷的发展趋势.     

稀土三基色荧光灯、荧光粉

<正> 复旦大学化学系于一九七八年开始研制稀土三基色荧光灯粉,经过一年多的努力,于一九八○年十二月正式鉴定。三种基色的荧光粉合成工艺稳定,在制管工艺中涂敷性能良好,操作容易,产品质量稳定。制成的高效、高显色的荧光灯,主要技术指标接近国际同类产品水平,其光衰与普通日光灯管相仿,光效可提高20%,在节能方面有较大的意义。稀土三基色荧     

白光LED用定向凝固Al_2O_3/YAG:Ce~(3+)共晶荧光复合陶瓷研究进展

白色发光二极管(WLED)具有长寿命、高光效、节能环保等独特优势,是目前公认的第四代绿色照明光源,在照明等高技术领域具有重要的应用前景。目前,WLED的主要实现形式为蓝光芯片搭配YAG:Ce~(3+)荧光粉,封装荧光粉的树脂导热性较差,导致LED的发光性能随温度的升高逐渐下降,难以应用于大功率照明。因此,如何获得高质量、高稳定性、无需树脂的块体荧光材料成为提升WLED发光效率和应用可靠性的关键。近年来,利用定向凝固方法制备的高性能Al_2O_3/YAG:Ce~(3+)块体共晶荧光复合陶瓷以其优良的发光性能、高温强度、热稳定性以及低的背散射损失和高量子效率,被认为是一种有望替代荧光粉、用于大功率WLED照明的新型块体荧光材料。总结了近年来发展的定向凝固Al_2O_3/YAG:Ce~(3+)共晶荧光复合陶瓷的主要制备方法,阐述了共晶荧光复合陶瓷的凝固组织、发光机理以及影响发光性能的主要因素,展望了白光LED用Al_2O_3/YAG:Ce~(3+)共晶荧光复合陶瓷的发展趋势。     

浮法联合车间照明工程设计例介

作者介绍了应用混光照明新技术,为浮法联合车间所做的照明设计一例.探讨了照度、照度均匀度及显色性的确定,照明方式、光源和灯具的选定,以及照明计算与配电等问题.     

LED光源特点及其在水泥厂的应用

正LED(Light Emitting Diode)光源是一种近年来发展迅速的新型节能光源,它的发光原理与现有的几种传统光源完全不同。早期LED光源发光效率较低,多应用于仪器仪表的指示灯、信号灯等领域。随着这种新型光源技术的不断成熟和提高,国内已形成完整的LED光源产业链。LED光源正快速进入工业照明领域,并逐步替代传统的照明光源。了解LED光源的特点、性能及适用范围,对水     

玻璃光效在家居产品设计中的应用研究

在家居产品设计中有很多应用玻璃材质的案例.玻璃材质有很好的透光性,日光和人造光源会使玻璃材质产生光影效果,很多时候人们只关注玻璃材质的显性功能,如照明、隔断、承重等,往往忽视了玻璃材质在居室空间中所形成的光效.玻璃光效会在居室空间中形成光氛围,其色彩、形式与光强度会影响人的行为和心理.从玻璃光效的特性出发,阐述玻璃光效的功能性、艺术性,分析玻璃光效与玻璃工艺之间的关系,使观者能够理解玻璃光效所蕴含的内在价值.     

Chromaticity changes of inorganic pigments in Chinese traditional paintings due to the illumination of frequently‐used light sources in museum

Optical radiation can cause permanent damage to the color of Chinese traditional paintings, which have extremely high responsivity in the museum illumination. In order to obtain quantitative influence laws of artificial illumination on inorganic pigments in Chinese traditional paintings and provide basis for choosing light sources, a long periodic illumination experiment was carried out to examine how prolonged exposure of three light sources (tungsten halogen, metal halide and white light emitting diodes), frequently‐used in museums, affect the chromaticity of five inorganic pigments [azurite (blue), cinnabar (red), orpiment (yellow), ancient graphite (black), clam shell powder (white)], commonly used in Chinese traditional paintings. Through the experiment, we found that the illumination causes a color change to inorganic pigments, and the degree of which is related to the photochemical stability of pigments and the high energy shortwave radiation in the light source spectrum. We also obtain the color change laws of the five pigments and the quantitative relationships of color damage for different painting types. These results can provide data basis for related research on Chinese traditional painting illumination and choice basis for light sources in museum lighting designs.     

白光LED用新型荧光粉的探索

白光LED具有效率高、寿命长、响应快、安全、环保等优点,被誉为继白炽灯、荧光灯和高强度气体放电灯后的“第四代照明光源”.白光LED用荧光材料的制备及其发光性能的研究已成为半导体照明领域的一个热点.本文主要从蓝光芯片激发和近紫外光芯片激发的角度分别介绍了钼酸盐红色荧光粉和单一基质白光荧光粉的研究概况.     

Designing white‐light LED lighting for the display of art: A feasibility study

When displaying art, several criteria must be balanced when designing illumination including the artist's intention, damage, energy efficiency, viewing experience and understanding, and for commercial galleries and sales. The most common lighting for art includes natural daylight and incandescent spotlights. Neither source is optimal for all criteria; thus there is considerable interest in the use of white‐light light‐emitting diode (LED) lighting. A feasibility study was conducted to address two questions. First, was it possible to design a three‐primary LED source that yielded the same color rendering as common museum lighting? Second, could one design the lighting to achieve specific color appearance attributes? Three‐primary lights using a Gaussian function were optimized matching the chromaticity of D65 and minimizing color differences for a set of acrylic dispersion paints. The optimal wavelengths depended on bandwidth. Lights were also optimized that either maximized or minimized average chroma. A set of real LEDs was selected that produced similar results when evaluated computationally. A source that increases chroma may be useful when used to illuminate works of art with high light sensitivity: very low illuminances are necessary and such a source will compensate for the reduction of colorfulness and visual clarity. A source that decreases chroma may be used to render art in similar fashion to low‐light conditions such as churches and caves. In general, white LED lighting is advantageous for art conservation because they do not emit UV and IR radiation and their visible radiation is reduced when compared with their continuous spectrum equivalent. © 2010 Wiley Periodicals, Inc. Col Res Appl, 2011     

An evaluation of the Hunt94 color appearance model under different light sources at low photopic to low mesopic light levels

Color appearance models allow for the quantification of color appearance under a variety of viewing conditions. Such models may ultimately provide a measure for accurate assessments of the color‐rendering properties of light sources. This article evaluates the Hunt94 color appearance model using a new set of color‐naming and magnitude‐rating data. At one photopic level (10 cd/m²), the evaluations showed that for a xenon lamp and an enhanced metal halide lamp that have chromaticities and spectra close to an equal energy spectrum, the Hunt94 model provided good predictions of the primary and secondary color names and hue magnitudes for a wide range of color chips under the two illuminants. However, for other light sources the Hunt94 model predictions deviated considerably from the evaluations. Three modifications were applied to the Hunt94 color appearance model to predict color‐naming and magnitude‐rating data better for all light sources. The modified Hunt94 model gave good predictions (correlation coefficients r ～ 0.95) of the secondary hue magnitude of the color chips used in the experiment at photopic light levels (10 cd/m² and 1 cd/m² background luminances) under “white” light sources. However, the modified model was still unable to predict color appearances at low mesopic light levels (0.1 cd/m² and 0.01 cd/m²). © 2005 Wiley Periodicals, Inc. Col Res Appl, 30, 107–117, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20088     

White light emission of wide-bandgap silicon carbide: A review

White light-emitting diodes (LEDs) are the most promising alternative to the conventional lighting sources due to their high efficacy and energy saving in illumination. Silicon carbide (SiC) has a wide optical bandgap and could be tailored to emit light at different wavelengths across the entire visible spectrum by introducing different dopants. Donor and acceptor (DA) co-doped fluorescent SiC (f-SiC) is a potential candidate for replacing phosphor material in white LEDs, as it has been observed as a good wavelength converter overcoming the disadvantages of rare earth-containing phosphors, such as poor color-rendering index (CRI), short lifetime, and short degradation time. The current study attempts to present an overview on the available approaches to fabricate f-SiC for generating the white light emission and challenges in fundamental research issues to enhance quantum efficiency, color rendering performance, stability, reproducibility of color quality, and lifetime of f-SiC.     

Color rendering: A tale of two metrics

It was the best measure of color rendering, it was the worst measure of color rendering. Color rendering index (CRI) is the most common metric used by the lighting industry to represent the color rendering properties of electric light sources. CRI was intended to characterize how “true” or “natural” objects appeared when illuminated by a light source, but was never intended to, for example, represent how well object colors could be differentiated under a light source, another important aspect of color rendering. Data presented here demonstrate that CRI in conjunction with another measure of color rendering, gamut area index (GAI), is useful at predicting subjective judgments of how “natural” objects appear as well as how “vivid” objects appear, and how well one can discriminate between subtle differences in hue. Neither measure by itself, however, is sufficient for meeting all of the expectations of a light source for providing good color rendering under all viewing conditions. It remains for future research to determine if just two metrics are sufficient to assure good color rendering from a light source and whether these two metrics (CRI and GAI) are the best for such purpose. In the meantime, CRI and GAI should be used jointly in recommendations as practical, useful, and mutually reinforcing measures of color rendering. The data presented here also demonstrate that total irradiance is important for good color rendering. © 2008 Wiley Periodicals, Inc. Col Res Appl, 33, 192–202, 2008     

Lighting the world's treasures: Approaches to safer museum lighting

A strategy is reported to optimize lighting to reduce photochemical degradation of works of art and archival documents. The strategy revolves around improving luminous efficiency of the spectral profile to exclude light which doesn't contribute to brightness or color perception, while also trying to maintain color rendering. The work focuses on Old Master Drawings and designing filters for illuminants, but is applicable to the broad range of art and archival documents and the direct design of lighting without filters such as LED. A filter profile is identified which seems to be beneficial, or at worst neutral for all pigments measured. Underlying principles are identified: (1) The best luminous efficiencies arise from multiple band illuminants, and also improves as color rendering is sacrificed. (2) Protection of an object even late in its damage life can significantly extend its remaining life. (3) Protection of an object early in its life can possibly abate some of the light induced damage it may experience across its life, so early intervention in light protection may be advised. This report further goes on to suggest approaches to further enhance the protection, including tailoring the spectral dependence of appearance change. © 2010 Wiley Periodicals, Inc. Col Res Appl, 2010     

发光材料在防眩光交通监控补光照明中的应用

交通监控补光源在工作时产生的强烈眩光会干扰驾驶员视线,从而给道路安全带来了隐患。考虑到人眼对于不同色光的敏感程度,通过改进补光源的光谱分布,提高人眼较不敏感的红光部分,能够有效地减轻眩光。这需要改变发光器件中的荧光粉组成。本文通过高温固相反应法制备了铈掺杂的钇铝镓石榴石基黄绿色荧光粉以及铕掺杂的钙锶铝硅氮化物红色荧光粉。所合成样品均为纯相,粉末颗粒分布均匀。光谱测试表明,样品能够被可见蓝光有效激发,发射光分别位于黄绿光区和红光区。将上述荧光粉与蓝光芯片复合封装得到发光器件。测试表明,红色荧光粉能够显著改善发光器件的色温、显色指数等照明品质,在保持白光的同时能够减少光谱中的黄绿光部分,从而缓解眩光效应。     

High-efficiency phosphor-in-glass with ultra-high color rendering indexing for white laser diode lighting

Stable color converters exhibiting high color rendering index have drawn researchers’ attention for their applications in high-quality white laser lighting. In this study, we develop the multi-color phosphor-in-glass (PIG) with the weight ratio of green-emitting (Y₃Al_3.08Ga_1.92O₁₂:Ce³⁺) to red-emitting (CaAlSiN₃:Eu²⁺) phosphor powders (10/1–18/1) by low temperature co-sintering method. The obtained composite material displays an outstanding optical and thermal performance, including a high internal quantum efficiency of 84.2%, a high transparency of 45% in the visible region and a low thermal quenching (it remains 86% at 448 K). By integrating 450 nm blue laser diodes with optimized multi-color PIG, the white light with a maximum luminous flux of 258 lm and a luminous efficiency of 137 lm/W is achieved for the first time. Additionally, considering the white balance, by tailoring the weight ratio of green-emitting to red-emitting phosphor and the thickness of PIG, the 14/1 PIG at fixed thickness of 0.75 mm produces pure white light with ultra-high color rendering index of 95.2 and a high luminous efficiency of 120.9 lm/W under power density of 2.39 W/mm² irradiation. The above superior characteristics imply that the multi-color PIG is an ideal candidate for high-quality white laser lighting applications.