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Issue 5, 2014
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Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

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Abstract

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.

Graphical abstract: Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

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Publication details

The article was received on 07 Oct 2013, accepted on 18 Nov 2013 and first published on 26 Nov 2013


Article type: Paper
DOI: 10.1039/C3NR05226E
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Nanoscale, 2014,6, 2624-2628

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    Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

    Y. Hsiao, C. Chen, L. Huang, G. Lin, D. Lien, J. Huang and J. He, Nanoscale, 2014, 6, 2624
    DOI: 10.1039/C3NR05226E

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