Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips.
Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips.
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DOI：
10.1039/c3nr05226e
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发表时间：
2014-02
期刊：
影响因子：
6.7
通讯作者：
Yu-Hsuan Hsiao;Cheng-Ying Chen;Li-chuan Huang;G. Lin;D. Lien;Jian-jang Huang;Jr-hau He
中科院分区：
文献类型：
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作者：
Yu-Hsuan Hsiao;Cheng-Ying Chen;Li-chuan Huang;G. Lin;D. Lien;Jian-jang Huang;Jr-hau He
采用水热法在InGaN/GaN发光二极管（LED）上制备了针筒状ZnO纳米棒（NR）。在不牺牲LED的电气性能的情况下，类锯齿形NR可以在20 mA下将光提取能力提高10.5%，并以136°至121°的视角准直成形辐射轮廓。通过光学实验和数值模拟，发现纳米棒的波导效应和ZnO纳米棒锥形端部对折射率突变的抑制作用是纳米棒具有上级光提取效率和更准直的辐射方向图的原因。这项工作证明了纳米结构形态在LED性能中的重要性，并为各种光学器件的纳米结构设计提供了指导。
Syringe-like ZnO nanorods (NRs) were fabricated on InGaN/GaN light emitting diodes (LEDs) by a hydrothermal method. Without sacrificing the electrical performances of LEDs, syringe-like NRs can enhance light extraction capability by 10.5% at 20 mA and shape the radiation profile with a view angle collimated from 136° to 121°. By performing optical experiments and simulation, it is found that the superior light extraction efficiency with a more collimated radiation pattern is attributed to the waveguiding effect of NRs and the mitigation of abrupt index change by the tapered ends of syringe-like ZnO NRs. This work demonstrates the importance of the nanostructure morphology in LED performances and provides the architecture design guidelines of nanostructures to a variety of optical devices.