【摘 要】
：
Light-emitting diodes (LEDs) fabricated in the InGaN/GaN material system are widely used in applications where high quantum efficiency and output powers at
论文部分内容阅读
Light-emitting diodes (LEDs) fabricated in the InGaN/GaN material system are widely used in applications where high quantum efficiency and output powers at high drive current densities are valuable.In typical state-of-the-art multiple-quantum-well (MQW) InGaN–GaN LEDs,the quantum efficiency has a maximum at a drive current density (10 A/cm2) and decreases to as little as half of its maximum value at drive current densities above 100 A/cm2.This phenomenon has been defined as “efficiency droop”.
其他文献
As a new kind of resource saving and environment friendly aquaculture mode,the industrial recirculating aquaculture system is currently demonstrated and use
Inserting an AlN buffer layer in GaN substrate in LED manufacturing process can effectively improve the performance of LED optoelectronic devices and reduce
近年来,我省水运规费几经调整,但规费征收总额并未随征费标准的提高而同幅增长,相反有逐年下降的趋势,而船舶的实际吨位有增无减。就拿我们宝应县来说,1992年水上运输管理费
COLOUR RENDERING INDEX (CRI) IS THE ONLY INTERNATIONAL RECOGNIZED COLOUR RENDERING METRIC,WHICH EXPRESSES THE COLOUR RENDERING PROPERTIES OF LIGHT SOURCES A
从"小不点"到"大力神"遨游火星的主角是火星漫游机器人,它们又被称为"火星漫游车",是火星上不辞辛苦的"原野地质学家"。正因为它们的存在,人类才在地球之外的另一颗行星上进行了极为精细的原野考察。如今,这种探测方式不再局限于火星。可以预见,在未来,对星球的地面漫游考察将成为人类探索太阳系的一种重要方式。
为了探索一条发展农村小额贷款的路子 ,以谋求农行业务经营的效益 ,区分行组织了课题组 ,以平果县支行为调查点 ,进行了一次深入的调查。一、开办农村生产经营、生活消费小额
法比恩·库斯托是法国著名的海洋探险家和导演,2006年他曾在纪录片《鲨鱼末日》中自制了一条约4米长的仿鲨鱼潜艇.潜艇外部由一层类似鱼皮的材料包裹,安装在尾部的马达可以让
在改革交通投资体制中采取股份制的办法,使投资各方建立起利益共享、风险共担的机制,这是加快我国公路交通发展的重要途径。近年来,江苏、海南、广东、四川等省已在这方面迈
2020年7月30日,美国的"毅力号"火星车从佛罗里达州升空。与以往的火星任务不同的是,这次有一个"小家伙"跟随升空,它就是即将在火星上翱翔的首架无人机——"机智号"。"机智号"有多大美国本次火星探索任务主要是将"毅力号"送上火星,而"机智号"不过是个"添头",一点也不起眼。这从对它们的投入就可以看出:"毅力号"耗资24亿美元,而"机智号"仅耗资0.85亿美元。
FOR THE POOR RESISTANCE TO HEAT AND LIGHT DAMAGE AS WELL AS THE WARPAGE LIMITATION,TRADITIONAL THERMOPLASTIC REFLECTING MATERIAL,SUCH AS POLYPHTHALAMIDE (PP