共查询到18条相似文献,搜索用时 93 毫秒
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乔燕飞 《中国新技术新产品》2013,(17)
随着科技的发展,LED产业取得了长足的进步,其应用领域和范围不断的扩大,同时对LED的封装技术也提出了更高的要求。本文从RGB全彩LED光源工艺入手,分别从固晶、焊线不良引起的电失效,点胶不良引起的光失效,以及由于材料热膨胀、湿气等引起的机械失效三方面,系统的介绍了RGB全彩LED封装生产过程中经常遇到的异常。 相似文献
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LED照明产品设计研究 总被引:1,自引:1,他引:0
在现代照明领域, LED被称为第4代光源.由于LED技术特性和设计特点自成一格,具有鲜明特色和品质,因此被业内专家预测将是取代白炽灯、荧光灯等传统灯具的最具有竞争力的新型照明产品.对LED照明产品的设计研究,必将对灯具照明产品的可持续发展以及设计创新将产生积极影响和重要的应用推广价值. 相似文献
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Tuomas Haggren Ali Shah Anton Autere Joona-Pekko Kakko Veer Dhaka Maria Kim Teppo Huhtio Zhipei Sun Harri Lipsanen 《Nano Research》2017,10(8):2657-2666
Light management and electrical isolation are essential for the majority of optoelectronic nanowire (NW) devices.Here,we present a cost-effective technique,based on vapor-phase deposition of parylene-C and subsequent annealing,that provides conformal encapsulation,anti-reflective coating,improved optical properties,and electrical insulation for GaAs nanowires.The process presented allows facile encapsulation and insulation that is suitable for any nanowire structure.In particular,the parylene-C encapsulation functions as an efficient antireflection coating for the nanowires,with reflectivity down to <1% in the visible spectrum.Furthermore,the parylene-C coating increases photoluminescence intensity,suggesting improved light guiding to the NWs.Finally,based on this process,a NW LED was fabricated,which showed good diode performance and a clear electroluminescence signal.We believe the process can expand the fabrication possibilities and improve the performance of optoelectronic nanowire devices. 相似文献
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液晶显示器(LCD)现在已经广泛应用于电视、计算机、手机、监控器等电器上,但液晶本身并不发光,因此需要背光照明。目前多数LCD采用冷阴极射线荧光灯(CCFL)作为背光源,但其亮度输出均匀度差,而且使用寿命不长;使用LED作为LCD的背光源,可以缩小LCD的体积,提高其可靠性和稳定性,并大大延长其使用寿命。本文详述LED作为LCD背光源的种种优缺点和发展趋势。 相似文献
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综述了国内外在LED钝化材料、钝化工艺和钝化处理时LED性能的影响等方面的一些主要研究进展,指出了以蓝宝石为衬底CaN基LED钝化材料存在的问题和研究方向,特别强调以Si为衬底的LED钝化膜的研究趋势.现阶段的钝化材料主要有SiN_x、SiO_2、SiON_x等,常用的钝化方法有等离子体增强化学气相沉积(PECVD)、磁控溅射和电子束蒸发等.对LED芯片的钝化处理可以降低LED器件的漏电流和提高其光输出功率,然而,这也会导致LED的P区载流子数量的下降和芯片表面应力的增加. 相似文献
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Red phosphors are the traditional material used to improve the color rendering index (CRI) of white light emitting diode (WLEDs). In this paper, red quantum dots (QDs) were fabricated and coated on the blue LED chip to replace the red phosphors. By comparing the thermal performances of the CRI for the two WLEDs, we found that WLEDs with the encapsulation of yellow phosphors and red QDs exhibited higher CRI and lower sensitivity to temperature than those with the encapsulation of yellow and red phosphors. The CRI of WLEDs with yellow phosphors and red QDs was 90.9, and its range ability was only 0.3 when the environment temperature changed from 25 °C to 100 °C, while the CRI of WLEDs with yellow and red phosphors was as low as 81.8, and the change of CRI was 2.2 during the same temperature variation. 相似文献