白小姐四肖必选一肖

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LED封装的取光效率分析


    来源:新世纪LED论坛  时间:2014-09-24  【字体:  

      5050白光,5MM发射管,常规一般是支架式,采用环氧树脂封装,功率较小,整体发光光通量不大,亮度高的也只能作为一些特殊使用。随着技术和封装技术的发展,顺应照明领域对高光通量 LED产品的需求,功率型LED逐步走入市场。这种功率型的LED一般是将发光芯片放在散热热沉上,上面装配光学透镜以达到一定光学空间分布,透镜内部填充低应力柔性硅胶。

      功率型LED要真正进入照明领域,实现家庭日常照明,其要解决的问题还有很多,其中最重要的便是发光效率。目前市场上功率型LED报道的最高流 明效率在50lm/W左右,还远达不到家庭日常照明的要求。为了提高功率型LED发光效率,一方面其发光芯片的效率有待提高;另一方面,功率型LED的封 装技术也需进一步提高,从结构设计、材料技术及工艺技术等多方面入手,提高产品的封装取光效率。

      一、影响取光效率的封装要素

      1.散热技术

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      2.填充胶的选择

      根据折射定律,光线从光密介质入射到光疏介质时,当入射角达到一定值,即大于等于临界角时,会发生全发射。以GaN蓝色芯片来说,GaN材料的折射率是2.3,当光线从晶体内部射向空气时,根据折射定律,临界角θ0=sin-1(n2/n1)。

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      3.反射处理

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      4.荧光粉选择与涂覆

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      二、结论

      良好的散热设计对提高功率型LED产品发光效率有着显着的作用,同时也是确保产品寿命和可靠性的前提。而设计良好的出光通道,这里 着重指反射腔、填充胶等的结构设计、材料选择和工艺处理,可以有效提高功率型LED的取光效率。对功率型白光LED来说,荧光粉的选择和工艺设计,对光斑 的改善和发光效率的提高也至关重要

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