共查询到20条相似文献,搜索用时 62 毫秒
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我国超高亮度LED和白光LED产业 总被引:3,自引:0,他引:3
我国超高亮度LED和白光LED产业化现状 我国发光二极管(LED)也步于20世纪70年代,80年代形成产业,90年代已具相当规模.在90年代后期,我国超高这度LED产业迅猛发展,经历了进口器件销售一进口管芯封装(1998年前100%进口)一进口外延片制管芯、封装-自主生产四个阶段,现已具有GaAs和GaP单晶、外延片、芯片的大批量生产能力. 相似文献
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晶片键合在AlGaInP发光二极管中的应用 总被引:1,自引:0,他引:1
(AlxGa1-x)0.5In0.5P高亮度发光二极管是在GaAs衬底上匹配外延的,它的外量子效率受限于吸收光线的GaAs衬底。LED晶片键合技术可以把LED外延片和GaP透明衬底、金属镜面衬底或蓝宝石衬底结合以提高出光效率。本文对上述三种晶片键合的器件制备过程和器件特点进行了描述。 相似文献
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为解决我国发光二极管管芯的大量进口问题,我们自行设计并制造了氢化物立式外延炉.采用微机程序控制系统来控制外延生长.在较短的时间内摸索出了生长较好外延片的工艺条件.所生长GaAs_(0.6)P_(0.4)/GaAs外延片可达到进口外延片水平.通过反复的工艺试验,基本摸索出了生长红、橙两种发光二极管外延片的工艺条件.所制成的CaAs_(0.6)P_(0.4)/GaAs外延片可达到进口商品外延片水平.我们的系统每炉可投入φ50衬底片三片;同一炉各片之间外延层的 相似文献
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采用厚溶液、低温液相外延(LPE)的生长办法研制出了高亮度GaP绿色发光二极管(LED)。为了获得高质量的P-n结,选定了最佳化的LPE生长条件。特别是要减少非辐射复台中心,必须大大地降低靠近结的n-GaP的载流子浓度。本研究工作中,采用水平滑动的LPE系统,该系统相似于Saul和Roccaseca所采用的。Ga溶液含有过饱和的GaP,并在Ga溶液上盖一块GaP,通过溶液槽流到石墨舟孔 相似文献
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采用X光双晶衍射仪分析了GaN基发光二极管外延材料晶体结构质量并制成GaN-LED芯片,对分组抽取特定区域芯片封装成的GaN-LED器件进行可靠性试验.对比分析表明,外延晶片中的微缺陷与器件可靠性的关系密切;减少外延晶片中的微缺陷密度有利于提高LED器件的可靠性.通过建立从外延片晶体结构质量、芯片光电参数分布到器件可靠性的分析实验方法,为GaN-LED外延材料生长工艺的优化和改善提供依据,达到预测和提高器件可靠性的目的. 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献
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“计算机组成原理”设计性实践教学模式研究 总被引:1,自引:0,他引:1
本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨. 相似文献