共查询到20条相似文献,搜索用时 93 毫秒
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建立了发光二极管提取效率的理论计算模型,分析了影响隧道再生双有源区AlGaInP发光二极管提取效率的主要因素,包括从出光表面出射的光、体内的光吸收损耗、衬底对光的吸收损耗、金属电极对光的吸收损耗,模拟计算了隧道再生双有源区AlGaInP发光二极管的提取效率,计算得到隧道再生双有源区AlGaInP LED管芯的上有源区和下有源区提取效率分别为5.24%和9.16%。 相似文献
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全方位反射镜(ODR)AlGaInP发光二极管能够有效提高光提取效率。对全方位反射镜的设计及工艺进行优化:采用λ/4n厚的SiO2作为介质,光刻腐蚀导电孔,带胶保护,溅射AuZnAu,剥离后,再溅射300nmAu层,形成的ODR退火后在波长630nm处的反射率为72.1%,而单次溅射AuZnAu的反射率退火后为63.2%。实验结果说明新工艺满足了欧姆接触的需要,反射率提高了8.8%。 相似文献
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分析了隧道再生双有源区A lG aInP发光二极管的工作原理,测试了不同注入电流下管芯的轴向光强,得到了轴向光强随注入电流的变化关系。20 mA注入电流条件下,发射峰值波长为620 nm的隧道再生双有源区A lG aInP发光二极管,透明封装成视角15°后平均轴向光强达到5.5 cd。对透明封装成15°隧道再生双有源区发光二极管进行了寿命实验,在温度为25°C、30 mA直流电流条件下,隧道再生双有源区A lG aInP发光二极管的寿命超过了1.2×105h。 相似文献
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表面粗化提高红光LED的光提取效率 总被引:2,自引:0,他引:2
介绍了通过出光表面粗糙化来减少全反射的方法,实验中使用化学湿法腐蚀的技术获得预计的粗糙形貌,结果给出不同参数下的光强和光辐射功率比较,器件的外量子效率得到了约29%的提高。从理论和测试结果两方面阐述了表面粗糙化对提高红光LED外量子效率的机理。 相似文献
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湿法表面粗化提高倒装AlGaInP LED外量子效率 总被引:1,自引:1,他引:0
介绍了一种利用盐酸、磷酸混合液对不同Al组分(AlxGa1-x)0.5In0.5P的选择性腐蚀特性对倒装AlGaInP红光LED进行表面粗化的方法。通过向粗化层GaInP加入适量的Al,在Al组分为0.4时,利用体积比为1∶10的HCl∶H3PO4可以得到横向尺寸约为60nm,纵向尺寸约为150nm的最有利于出光的类三角圆锥型表面结构。器件测试结果表明,在20mA注入电流下,器件外量子效率比粗化前提高了80%。 相似文献
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全方位反射镜(ODR)AIGaInP发光二极管能够有效提高光提取效率。对全方位反射镜的设计及工艺进行优化:采用2/4n厚的SiO2作为介质,光刻腐蚀导电孔,带胶保护,溅射AuZnAu,剥离后,再溅射300nmAu层,形成的ODR退火后在波长630nm处的反射率为72.1%,而单次溅射AuZnAu的反射率退火后为63.2%。实验结果说明新工艺满足了欧姆接触的需要,反射率提高了8.8%。 相似文献
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By using the wafer bonding technique and wet etching process, a wafer bonded thin film AlGaInP LED with wet etched n-AlGaInP surfaces was fabricated. The morphology of the etched surface exhibits a pyramid-like feature. The wafer was cut into 270× 270 μm2 chips and then packaged into TO-18 without epoxy resin. With 20-mA current injection, the light intensity and output power of LED-I with surface roughening respectively reach 315 mcd and 4.622 mW, which was 1.7 times higher than that of LED-II without surface roughening. The enhancement of output power in LED-I can be attributed to the pyramid-like surface, which not only reduces the total internal reflection at the semiconductor-air interface but also effectively guides more photons into the escape angle for emission from the LED device. 相似文献
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By using the wafer bonding technique and wet etching process,a wafer bonded thin film AlGaInP LED with wet etched n-AlGaInP surfaces was fabricated.The morphology of the etched surface exhibits a pyramid-like feature.The wafer was cut into 270×270μm~2 chips and then packaged into TO-18 without epoxy resin.With 20-mA current injection,the light intensity and output power of LED-Ⅰwith surface roughening respectively reach 315 mcd and 4.622 mW,which was 1.7 times higher than that of LED-Ⅱwithout surface rou... 相似文献
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A kind of AlGaInP light emitting diode (LED) with surface anti-reflecting structure has been introduced to solve the problems of low light efficiency and restricted luminous intensity. The new structure can be demonstrated theoretically and experimentally, and LEDs with the new structure have higher on-axis luminous intensity and larger saturation current than conventional LEDs and LEDs with ITO film only, which is caused by higher external quantum efficiency and also higher internal quantum efficiency. The new LEDs are especially suitable for working at large injected currents. 相似文献
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he new LEDs are especially suitable for working at large injected currents. 相似文献
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研究一种表面再构的具有全方位反光镜(ODR)结构的倒装AlGaInP半导体发光二极管(LED)。通过湿法腐蚀方法再构N-AlGaInP盖层表面,形成类金字塔的表面结构,使不同角度入射的光有更多的机会出射。比较了表面再构LED与常规LED的电、光学特性,在注入电流为20 mA时,经过表面再构LED的轴向光强和输出光功率是常规LED的1.5倍,表面再构后大大提高了LED的外量子效率,减少了LED内部热量的积累,提高了LED芯片的可靠性。 相似文献
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Flexible light-emitting diodes(LEDs)are highly desired for wearable devices,flexible displays,robotics,biomedicine,etc.Traditionally,the transfer process of an ultrathin wafer of about 10–30μm to a flexible substrate is utilized.However,the yield is low,and it is not applicable to thick GaN LED chips with a 100μm sapphire substrate.In this paper,transferable LED chips utilized the mature LED manufacture technique are developed,which possesses the advantage of high yield.The flexible LED array demonstrates good electrical and optical performance. 相似文献
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采用湿法溶液粗化AlGaInP基红光LED表面GaP层 ,并在粗化后的GaP表面沉积ITO,研究了粗化时间对GaP表面形貌的影响,并利用SEM、半导 体 芯片测试机、X射线衍射仪、X射线光电子能谱对LED器件表面形貌、光电特性曲 线、界面晶向、元素特性进行表征,比较了粗化前后的LED亮度和光电特性变 化。测试结果表明:采用HIO4、I2、HNO3系列粗化液在室温、粗化时间为30 S 时,有效增加了光在通过GaP面与ITO界面时的出光角度,使AlGaInP发光二极管 的发光效率提高21.4%,同时引起界面处的缺陷密度升高,费米能级 远离价带,主波长蓝移0.36 nm,正向电压上升0.04 V。 相似文献