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为利用多个不同波段LED光源对目标光谱快速准确地匹配,基于实测LED光谱信息建立光谱数据库,通过求解超定方程组的非负最小二乘解,对多个LED光源组合进行优化,实现在选用LED个数最少时完成与目标光谱的匹配.研究结果表明,该方法可以较准确地完成与健康照明实验室中目标光谱的匹配,选用4、5、6、7种LED光源组合进行匹配后相关指数分别为0.957,0.984,0.985,0.986.匹配选用LED种类越多,拟合越精确,但在实际应用中应同时考虑封装及散热等问题. 相似文献
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COB白光LED的光提取效率研究 总被引:1,自引:0,他引:1
针对LED高光效、高显色指数的要求,在分析LED光学性能的基础上,采用板上芯片(COB,Chip on Board)技术研究了表面涂覆硅胶量对COB白光LED的光通量、光效、色温和显色指数的影响,并提出一种高光效、高显色指数、低色温的白光LED封装方案,提高了COB白光LED的出光效率,实现了特定的光学分布,最终实现14 W COB封装结构下的白光LED,在电流密度为30 A/cm2时,其色温、显色指数及光效分别为4 900 K、82和125 lm/W. 相似文献
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Visible light communication (VLC) technology is a new type of wireless communication technology, which employs a light source as the carrier of information to realize illumination and communication simultaneously. This paper adopts a single InGaN/GaN-base multi-quantum well blue micro-light emitting diode (LED) as the light source, designs pre-emphasis circuit, LED driver circuit, impedance matching network, etc., and builds a high-speed real-time VLC system. It has been verified that the LED achieves a 3 dB modulation bandwidth of 450 MHz or more; and the real-time communication rate reaches over 800 Mbit/s at a distance of 2 m. The communication bit error rate (BER) is as low as at a communication rate of 622 Mbit/s. Experimental indicators including 3 dB bandwidth, communication rate, and communication BER are all taken into account. Therefore, this VLC system supports high-quality high-speed real-time communication. 相似文献
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